151
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Evaluating the impacts of a high concentration of powdered activated carbon in a ceramic membrane bioreactor: Mixed liquor properties, hydraulic performance and fouling mechanism. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2020.118561] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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152
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Zhang Y, Fu B, Wang X, Ma C, Lin L, Fu Q, Li S. Algal fouling control in low-pressure membrane systems by pre-adsorption: Influencing factors and mechanisms. ALGAL RES 2020. [DOI: 10.1016/j.algal.2020.102110] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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153
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Zhu Y, Cao L, Ni L, Wang Y. Insights into fouling behavior in a novel anammox self-forming dynamic membrane bioreactor by the fluorescence EEM-PARAFAC analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:40041-40053. [PMID: 32654034 DOI: 10.1007/s11356-020-09944-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 06/29/2020] [Indexed: 06/11/2023]
Abstract
Fouling behavior of the novel anaerobic ammonium oxidation (anammox) self-forming dynamic membrane bioreactor (SFDMBR) was elucidated, which is using nylon mesh as the filter with controlled fouling and successful anammox process. Properties of anammox sludge and foulants in the anammox SFDMBR and MBR (using PVDF microfiltration membrane) were compared to analyze the alleviated fouling in the SFDMBR, of which transmembrane pressure could be kept below 10 kPa for 50 days in one filtration cycle of 82 days with flux of 12 L m-2 h-1. Colorimetrical determination and excitation emission matrices-parallel factor (EEM-PARAFAC) analysis of the foulants showed that humic acid content in foulants on nylon mesh was obviously lower than that on PVDF membrane. Considering that the small-sized and flexible humic acids prefer to plug into membrane pores, the alleviated irreversible fouling in the SFDMBR could be attributed to the less microbial humic acid content of foulants (8.8 ± 1.0%) compared with the MBR (20.7 ± 2.9%). The adequate efflux of humic-like substances in the operation with nylon mesh was speculated to be the main mechanism of fouling control in the SFDMBR. These findings highlighted the potential of anammox SFDMBR in practical applications, because of the high humic acid contents in real ammonium-laden wastewater. Our study highlights the important role of humic acids in fouling behavior of the novel anammox SFDMBR to provide guidance for fouling control strategies. Graphical abstract.
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Affiliation(s)
- Yijing Zhu
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, People's Republic of China
| | - Lijuan Cao
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, People's Republic of China
| | - Lingfeng Ni
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, People's Republic of China
| | - Yayi Wang
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, People's Republic of China.
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154
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Asif MB, Maqbool T, Zhang Z. Electrochemical membrane bioreactors: State-of-the-art and future prospects. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 741:140233. [PMID: 32570070 DOI: 10.1016/j.scitotenv.2020.140233] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/11/2020] [Accepted: 06/13/2020] [Indexed: 06/11/2023]
Abstract
Integration of an electrochemical process with membrane bioreactor (MBR) has attracted considerable attention in the last decade for simultaneous improvement in pollutant removal and hydraulic performance of MBR. Electrochemical MBR (eMBR) with sacrificial anodes has been observed to achieve enhanced phosphorus (up to 40%) and micropollutant removal (5-60%). This is because direct anodic oxidation, indirect oxidation by reactive oxygen species and electrocoagulation can supplement the biological process. The application of an electric field can substantially reduce membrane fouling by 10% to 95% in the eMBR as compared to the conventional MBR. Sacrificial electrodes (e.g., iron or aluminium) have been reported to be more suitable for fouling mitigation than non-sacrificial electrodes (e.g., titanium). However, during prolonged operation, metal ions released from sacrificial electrodes can adversely affect microbial activity and could accumulate in activated sludge. Depending on the current density and electrode material (sacrificial or non- sacrificial), anodic oxidation, electrocoagulation, electrophoresis and/or electroosmosis mechanisms are responsible for suppressing membrane fouling propensity. This paper critically reviews the current status of the electrochemical MBR technology and presents a concise summary of eMBR configurations and electrode materials. Comparative removal of bulk organics, nutrients and micropollutants in the eMBR and conventional MBR is discussed, and performance governing factors are elucidated. Impacts of operating conditions such as current density on mixed liquor properties (e.g., floc size and zeta potential) and microbial activity are elucidated. The extent of membrane fouling mitigation along with associated mechanisms as well as energy consumption is explained and critically analysed. Future research directions are suggested to fast track the scalability of eMBR, which include but are not limited to electrode lifetime, development of self-cleaning conductive membranes, optimisation of operating parameters, removal of emerging micropollutants, accumulation of toxic metals in activated sludge, and degradation by-products and ecotoxicity.
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Affiliation(s)
- Muhammad Bilal Asif
- Institute of Environmental Engineering & Nano-Technology, Tsinghua-Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing 100084, China
| | - Tahir Maqbool
- Institute of Environmental Engineering & Nano-Technology, Tsinghua-Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing 100084, China
| | - Zhenghua Zhang
- Institute of Environmental Engineering & Nano-Technology, Tsinghua-Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing 100084, China.
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155
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Preparation of antibiofouling nanocomposite PVDF/Ag-SiO2 membrane and long-term performance evaluation in the MBR system fed by real pharmaceutical wastewater. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116938] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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156
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Enhancement of anti-fouling and contaminant removal in an electro-membrane bioreactor: Significance of electrocoagulation and electric field. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117077] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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157
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Li Y, Luo J, Wan Y. Biofouling in sugarcane juice refining by nanofiltration membrane: Fouling mechanism and cleaning. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2020.118432] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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158
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Qu F, Yang Z, Gao S, Yu H, He J, Rong H, Tian J. Impacts of Natural Organic Matter Adhesion on Irreversible Membrane Fouling during Surface Water Treatment Using Ultrafiltration. MEMBRANES 2020; 10:membranes10090238. [PMID: 32957473 PMCID: PMC7557390 DOI: 10.3390/membranes10090238] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 09/11/2020] [Accepted: 09/12/2020] [Indexed: 05/12/2023]
Abstract
To understand impacts of organic adhesion on membrane fouling, ultrafiltration (UF) membrane fouling by dissolved natural organic matter (NOM) was investigated in the presence of background cations (Na+ and Ca2+) at typical concentrations in surface water. Moreover, NOM adhesion on the UF membrane was investigated using atomic force microscopy (AFM) with colloidal probes and a quartz crystal microbalance with dissipation monitoring (QCM-D). The results indicated that the adhesion forces at the NOM-membrane interface increased in the presence of background cations, particularly Ca2+, and that the amount of adhered NOM increased due to reduced electrostatic repulsion. However, the membrane permeability was almost not affected by background cations in the pore blocking-dominated phase but was aggravated to some extent in the cake filtration-governed phase. More importantly, the irreversible NOM fouling was not correlated with the amount of adhered NOM. The assumption for membrane autopsies is doubtful that retained or adsorbed organic materials are necessarily a primary cause of membrane fouling, particularly the irreversible fouling.
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Affiliation(s)
- Fangshu Qu
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, China; (F.Q.); (Z.Y.); (H.Y.); (J.H.); (H.R.)
| | - Zhimeng Yang
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, China; (F.Q.); (Z.Y.); (H.Y.); (J.H.); (H.R.)
| | - Shanshan Gao
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;
| | - Huarong Yu
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, China; (F.Q.); (Z.Y.); (H.Y.); (J.H.); (H.R.)
| | - Junguo He
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, China; (F.Q.); (Z.Y.); (H.Y.); (J.H.); (H.R.)
| | - Hongwei Rong
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, China; (F.Q.); (Z.Y.); (H.Y.); (J.H.); (H.R.)
| | - Jiayu Tian
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;
- Correspondence: ; Tel.: +86-1392-8755-563
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159
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Teng J, Wu M, Chen J, Lin H, He Y. Different fouling propensities of loosely and tightly bound extracellular polymeric substances (EPSs) and the related fouling mechanisms in a membrane bioreactor. CHEMOSPHERE 2020; 255:126953. [PMID: 32402884 DOI: 10.1016/j.chemosphere.2020.126953] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 04/23/2020] [Accepted: 04/30/2020] [Indexed: 05/26/2023]
Abstract
In this study, fouling propensities of loosely bound extracellular polymeric substances (LB-EPSs) and tightly bound EPSs (TB-EPSs) in a membrane bioreactor (MBR) were investigated. It was found that, both the LB-EPSs and TB-EPSs possessed rather high specific filtration resistance (SFR), and LB-EPSs possessed about three times higher SFR but a lower adhesion ability than the TB-EPSs. A series of characterizations demonstrated that LB-EPSs had higher ratio of proteins to polysaccharides (PN/PS ratio), lower CO bonds content, higher hydrophilicity, higher deformation or mixing ability and more abundant high molecular weight (MW) substances than TB-EPSs. Thermodynamic analyzes revealed that the total interaction energy between the TB-EPSs and membrane was always attractive and strengthened, well explaining the higher adhesion ability of the TB-EPSs than the LB-EPSs. Meanwhile, the filtration process was found to be associated with gel layer formation, and the high SFR of EPSs was caused by the chemical potential change in gel layer filtration. According to the Flory-Huggins lattice theory, LB-EPSs tended to form a gel layer with higher cross-linking and/or polymer entanglement level because they contained more abundant high molecular weight (MW) substance, corresponding to higher SFR than that of the TB-EPSs. The proposed thermodynamic mechanisms well interpreted the different fouling propensities of LB-EPSs and TB-EPSs in MBRs.
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Affiliation(s)
- Jiaheng Teng
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Mengfei Wu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Jianrong Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
| | - Yiming He
- Department of Materials Science and Engineering, Zhejiang Normal University, Jinhua, 321004, China
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160
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Khan R, Wang H, Li Y, Yu S, Khan MK, Xiao K, Huang X. Surface Grafting of Reverse Osmosis Membrane with Chlorhexidine Using Biopolymer Alginate Dialdehyde as a Facile Green Platform for In Situ Biofouling Control. ACS APPLIED MATERIALS & INTERFACES 2020; 12:37515-37526. [PMID: 32701290 DOI: 10.1021/acsami.0c06037] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We report a new robust and green facile platform for nonoxidizing chemical grafting to simultaneously improve antifouling and antibacterial properties of thin film composite (TFC) polyamide (PA) reverse osmosis (RO) membranes. In this work, alginate dialdehyde (ADA) was used as a green platform to graft chlorhexidine (CH), a nonoxidizing chemical, on TFC-RO membrane surface. A synergistic effect due to ADA and CH grafting was revealed. The modified membrane surfaces were characterized using XPS, FT-IR, AFM, SEM-EDS, contact angle, and zeta potential analysis. A simple two-step Schiff base reaction was performed. Improved salt rejection performances were observed for the grafted PA membranes at the expense of negligible flux drop for the CH-ADA-PA membranes (38 to 42 L m-2 h-1) compared with the pristine PA membrane (45 L m-2 h-1). All the CH-ADA-PA membranes had excellent antibacterial activity against E. coli along with a highly superior resistance to the formation of biofilms. Organic fouling behaviors with a protein (bovine serum albumin, BSA) and a surfactant (dodecyl trimethylammonium bromide, DTAB) were investigated as typical foulants for the grafted PA membranes. The results indicated that the CH-ADA-PA membranes showed the best antifouling performance followed by the ADA-PA membranes, the pristine membrane being the most inferior. Hence, these results pave the way for a new robust and green bioinspired route for practical application in RO membrane fouling control.
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Affiliation(s)
- Rashid Khan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Han Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yufang Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Shuyan Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - M Kamran Khan
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Kang Xiao
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xia Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
- Research and Application Center for Membrane Technology, School of Environment, Tsinghua University, Beijing 100084, China
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161
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Wu M, Chen Y, Lin H, Zhao L, Shen L, Li R, Xu Y, Hong H, He Y. Membrane fouling caused by biological foams in a submerged membrane bioreactor: Mechanism insights. WATER RESEARCH 2020; 181:115932. [PMID: 32454321 DOI: 10.1016/j.watres.2020.115932] [Citation(s) in RCA: 120] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 05/10/2020] [Accepted: 05/11/2020] [Indexed: 06/11/2023]
Abstract
Though sludge foaming often occurs and thus causes serious membrane fouling in membrane bioreactors (MBRs), the fouling mechanisms related with the foaming phenomenon have not been well addressed, hindering better understanding and solving foaming problem. In this work, it was interestingly found that, the foulants during the foaming period possessed extremely high specific filtration resistance (SFR) (over 1016 m kg-1) and strong adhesion ability to membrane surface. Chemical characterization showed that the proteins (178.57 mg/L) and polysaccharides (209.21 mg/L) in the foaming sample were about 6.4 times and 5.4 times of those in the supernatant sample, suggesting existence of a mechanism permitting continuous production of these foulants in the MBR during the foaming period. It was revealed that the fouling caused by foams was associated with gel layer filtration process, and the extremely high SFR can be interpreted by chemical potential change in the gel filtration process depicted in Flory-Huggins theory. Meanwhile, analyses by the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory showed that the strong adhesion ability stemmed from the high interaction energy between the foaming foulants and membrane surface. In addition, 16S rDNA gene sequencing identified that the abundance of the foaming related bacteria species in the sludge suspension during the foaming period was more than 10 times of that during the non-foaming period. This study offered new mechanism insights into foaming fouling in MBRs.
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Affiliation(s)
- Mengfei Wu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Yifeng Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
| | - Leihong Zhao
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Liguo Shen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Renjie Li
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Yanchao Xu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Huachang Hong
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Yiming He
- Department of Materials Science and Engineering, Zhejiang Normal University, Jinhua, 321004, China
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162
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Xu X, Zhang H, Gao T, Wang Y, Teng J, Lu M. Customized thin and loose cake layer to mitigate membrane fouling in an electro-assisted anaerobic forward osmosis membrane bioreactor (AnOMEBR). THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 729:138663. [PMID: 32361430 DOI: 10.1016/j.scitotenv.2020.138663] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 04/02/2020] [Accepted: 04/10/2020] [Indexed: 06/11/2023]
Abstract
Anaerobic forward osmosis membrane bioreactor (AnOMBR) is a potential wastewater treatment technology, due to its low energy consumption and high effluent quality. However, membrane fouling is still a considerable problem which causes dwindling of water flux and shortening the membrane lifetime. In this study, electro-assisted anaerobic forward osmosis membrane bioreactor (AnOMEBR) was developed to treat wastewater and mitigate membrane fouling, in which the conductive FO membrane was used both as the separation unit and cathode. The formation, development and alleviation of membrane fouling in AnOMEBR were investigated. The results showed that the soluble microbial products (SMP) content and the proteins/polysaccharides (PN/PS) value in AnOMEBR were 26% and 15% lower than that in AnOMBR, respectively. The absolute value of Zeta of sludge mixture in AnOMEBR was 1.2 times that of the AnOMBR. The increase in the interaction between the membrane surface and the negatively charged foulants could inhibit the adsorption of foulants on membrane surface in the initial stage of membrane fouling. The strong interaction among foulants further affected the composition, structure and thickness of the cake layer on the FO membrane surface. AnOMEBR with a shorter hydraulic retention time, a higher organic loading rate and a lower osmotic pressure difference, could still obtain a lower flux decline rate of 0.063 LMH/h, which was 35.7% lower than AnOMBR. The wastewater treatment capacity of AnOMEBR was nearly 1.5 times that of the AnOMBR. This work provides an efficient strategy for mitigating membrane fouling and improving wastewater treatment capacity.
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Affiliation(s)
- Xiaotong Xu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, China
| | - Hanmin Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, China.
| | - Tianyu Gao
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, China
| | - Yuezhu Wang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, China
| | - Jiaheng Teng
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, China
| | - Mengyang Lu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, China
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163
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Carlson AL, Daigger GT, Love NG, Hart E. Multi-year diagnosis of unpredictable fouling occurrences in a full-scale membrane bioreactor. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:524-536. [PMID: 32960797 DOI: 10.2166/wst.2020.354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The membrane bioreactor (MBR) at the Traverse City Regional Wastewater Treatment Plant has experienced sudden and unpredictable periods of substantial permeability decline since 2011. Early observations detected irregularly-shaped Gram-positive bacteria that correlated with plant upsets. Use of biomolecular techniques, such as DNA sequencing of laboratory isolates and the mixed liquor microbial community, and fluorescent in situ hybridization, identified the dispersed organisms as members of the genus Staphylococcus. However, Staphylococcus species were consistently present during normal operation and therefore were more likely to be an indicator of the upset, not the cause. The results suggest that these microorganisms are responding to specific influent wastewater constituents. We chemically analysed seven mixed liquor samples from periods of permeability decline in 2017 and 2018, and four samples from a period of normal operation. During upset conditions, the total carbohydrate content exceeded that of normal operation by 40%. Additionally, mixed liquor calcium concentrations were 65% above normal during the upset in 2017. It is hypothesized and supported through multivariate statistical analysis and estimation of specific resistance to filtration values that a calcium-intermediated polymer bridging mechanism with extracellular polymeric substance constituents is a major contributor to fouling and permeability disruptions in the Traverse City MBR.
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Affiliation(s)
- A L Carlson
- Department of Environmental Engineering, University of Michigan, 1351 Beal Avenue, Ann Arbor, MI 48109, USA E-mail:
| | - G T Daigger
- Department of Environmental Engineering, University of Michigan, 1351 Beal Avenue, Ann Arbor, MI 48109, USA E-mail:
| | - N G Love
- Department of Environmental Engineering, University of Michigan, 1351 Beal Avenue, Ann Arbor, MI 48109, USA E-mail:
| | - E Hart
- Traverse City Regional Wastewater Treatment Plant, 606 Hannah Avenue, Traverse City, MI 49686, USA
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164
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Yu HQ. Molecular Insights into Extracellular Polymeric Substances in Activated Sludge. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:7742-7750. [PMID: 32479069 DOI: 10.1021/acs.est.0c00850] [Citation(s) in RCA: 163] [Impact Index Per Article: 40.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Extracellular polymeric substances (EPS) are known to crucially affect the properties and performance of activated sludge, but the detailed influential mechanisms and the pertinence to specific compositional, structural properties of EPS are still elusive. Such knowledge gaps have severely limited our ability in optimizing biological wastewater treatment processes, for which long-term robust and efficient sludge performance remains one of the main bottlenecks. Here, we overview the new knowledge on the molecular structure of sludge EPS gained over the past few years and discuss the future challenges and opportunities for further advancing EPS study and engineering. The structural and functional features of several macromolecules in sludge EPS and their important structural roles in granular sludge are analyzed in detail. The EPS-pollutant interactions and environment-dependent regulation machinery on EPS production are deciphered. Lastly, the remaining knowledge gaps are identified, and the future research needs that may lead to molecular-level understanding and precise engineering of sludge EPS are highlighted.
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Affiliation(s)
- Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
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165
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Zhou L, Zhang W, De Costa YG, Zhuang WQ, Yi S. Assessing inorganic components of cake layer in A/O membrane bioreactor for physical-chemical treated tannery effluent. CHEMOSPHERE 2020; 250:126220. [PMID: 32120146 DOI: 10.1016/j.chemosphere.2020.126220] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 01/17/2020] [Accepted: 02/13/2020] [Indexed: 06/10/2023]
Abstract
In this study, an anoxic-oxic membrane bioreactor (A/O-MBR), was used to treat effluent tannery wastewater pretreated by physicochemical processes. The A/O-MBR performed well during the experimental period and was able to produce a high-quality effluent containing 90 ± 10 mg-CODcr/L and 0.5 ± 0.1 mg-NH4+-N/L. However, it was observed that at rates of approximately 1.02 kPa/day and 1.2 μm/day, both transmembrane pressure (TMP) and thickness of cake layer increased during wastewater treatment. The eventual thickness of the cake layer was between 47.8 and 51.5 μm. Furthermore, an Inductively Coupled Plasma-Optical Emission Spectrometer, used to analyze inorganic components of the cake layer, revealed that four inorganic elements, Cr, Ca, Mg and Al were predominant (weight percentage rate 4:13:10:72). Due to low solubility (Cr(OH)3: Ksp 6.3 × 10-31; Al(OH)3: Ksp 6.3 × 10-19), the elements of Cr and Al mainly existed in the forms of Cr(OH)3 and Al(OH)3, respectively. Other minerals in the cake layer included Al2O3, CaCO3, and MgCO3. Additionally, using an SEM-EDX (Scanning electron microscopy-energy dispersive X-ray analyzer), we discovered that inorganic particles that formed within the activated sludge of the A/O-MBR steadily accumulating on the membrane surface, resulted in an evenly distributed inorganic layer which could be observed along the cross-sections of the cake layer.
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Affiliation(s)
- Lijie Zhou
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China.
| | - Wenyu Zhang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Yashika G De Costa
- Department of Civil and Environmental Engineering, University of Auckland, Auckland, 1142, New Zealand
| | - Wei-Qin Zhuang
- Department of Civil and Environmental Engineering, University of Auckland, Auckland, 1142, New Zealand
| | - Shan Yi
- Department of Chemical and Materials Engineering, University of Auckland, Auckland, 1142, New Zealand
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166
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Wang H, Zhang H, Zhang K, Qian Y, Yuan X, Ji B, Han W. Membrane fouling mitigation in different biofilm membrane bioreactors with pre-anoxic tanks for treating mariculture wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 724:138311. [PMID: 32272414 DOI: 10.1016/j.scitotenv.2020.138311] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 03/19/2020] [Accepted: 03/28/2020] [Indexed: 06/11/2023]
Abstract
This study compared the membrane fouling mitigation in two novel types of biofilm membrane bioreactor coupled with a pre-anoxic tank (BF-AO-MBR)-namely a fixed biofilm membrane bioreactor (FB-MBR) with fiber bundle bio-carriers and a moving-bed biofilm membrane bioreactor (MB-MBR) with suspended bio-carriers-relative to an anoxic/oxic MBR (AO-MBR), at salinities ranging from zero to 60 g/L. The results showed that the FB-MBR mitigated membrane fouling to a greater degree than the MB-MBR and AO-MBR. During operation, the FB-MBR exhibited the lowest fouling development, with three membrane filtration cycles, while the AO-MBR and MB-MBR had 22 and nine cycles, respectively. The key fouling factor in all reactors was cake layer resistance (RC), which contributed to 89.61, 62.20, and 83.17% of the total fouling resistance (RT) in AO-MBR, FB-MBR and MB-MBR, respectively. Additionally, in the FB-MBR, the pore blocking resistance (30.07%) was also an important cause of fouling. Fiber bundle bio-carriers and suspended bio-carriers reduced the RT by 37.68% and 21.24% (mainly the RC) compared to that of AO-MBR. Furthermore, FB-MBR and MB-MBR caused a decrease of suspended biomass (80.14 and 15.90%, respectively), and the latter exhibited a higher sludge particle size than AO-MBR, possibly resulting in the cake layer decline. The studied BF-AO-MBRs further alleviated the fouling propensity by reducing the amount of soluble microbial product (SMP) and extracellular polymeric substances (EPS) under all salinity levels, especially the FB-MBR. Among the protein components, the amounts of tryptophan protein-like substance and aromatic protein-like substance were significantly lower in the FB-MBR compared to the AO-MBR and MB-MBR. Additionally, at 60 g/L salinity, the structure of the microbial community in the FB-MBR had a lower abundance of Bacteroidetes and more biomacromolecule degraders, which may have contributed to the moderation of membrane fouling.
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Affiliation(s)
- Hanqing Wang
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Polytechnic Institute, Zhejiang University, Hangzhou 310000, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
| | - Huining Zhang
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China.
| | - Kefeng Zhang
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
| | - Yongxing Qian
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
| | - Xin Yuan
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
| | - Bixiao Ji
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
| | - Wanling Han
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
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167
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Meng D, Jin W, Chen K, Zhang C, Zhu Y, Li H. Cohesive strength changes of sewer sediments during and after ultrasonic treatment: The significance of bound extracellular polymeric substance and microbial community. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 723:138029. [PMID: 32217388 DOI: 10.1016/j.scitotenv.2020.138029] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 02/24/2020] [Accepted: 03/17/2020] [Indexed: 06/10/2023]
Abstract
Sewer flushing is widely used to remove sewer sediment from drainage systems; however, its performance and cleaning efficiency are limited by the cohesive strength of sewer sediment. To address this, ultrasound, as a clean technology, is proposed to reduce the cohesive strength of sewer sediment. This study investigated the variations in the cohesive strength, extracellular polymeric substances (EPSs), and microbial community of sewer sediment with ultrasonic treatment. During ultrasonic conditioning, the degradation process of the cohesive strength followed the first-order kinetic model and was positively related to the degradation of bound-EPSs. Field emission scanning electron microscopy, particle diameter, and three-dimensional excitation emission analyses suggested that ultrasound reduced the cohesive strength by decreasing the bound-EPS concentration, which reduced the particle size of sewer sediment, and by destroying the structure of tryptophan proteins, which impaired the stability of agglomerated particles. Following ultrasonic treatment, the cohesive strength of the treated sediment was reduced to 69.3% of that of the raw sewer sediment after storage for 21 days; this result could be ascribed to the improvements in polysaccharide transport, amino acid transport, and the cell wall biogenesis functions of the microbial community, as indicated by PICRUSt. Furthermore, next-generation sequencing studies suggest that the proportions of Syntrophomonadaceae, Bacteroidetes_vadinHA17, Synergistaceae, and Syntrophaceae, which are associated with anaerobic digestion and methane production in sediment, improved conspicuously after ultrasonic conditioning.
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Affiliation(s)
- Daizong Meng
- College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, China; Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, 200092 Shanghai, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Wei Jin
- College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, China; Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, 200092 Shanghai, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Keli Chen
- Urban & Rural Construction Design Institute CO, LTD, 310020 Hangzhou, China
| | - Chen Zhang
- Shanghai Municipal Engineering Design Institute (Group) Co., Ltd, 901 North Zhongshan 2nd Road, 200092, China
| | - Yingjie Zhu
- College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, China; Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, 200092 Shanghai, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Huaizheng Li
- College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, China; Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, 200092 Shanghai, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
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168
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Yogev U, Vogler M, Nir O, Londong J, Gross A. Phosphorous recovery from a novel recirculating aquaculture system followed by its sustainable reuse as a fertilizer. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 722:137949. [PMID: 32208278 DOI: 10.1016/j.scitotenv.2020.137949] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/12/2020] [Accepted: 03/13/2020] [Indexed: 06/10/2023]
Abstract
Phosphorus (P) is an essential element for life that is introduced through feed in modern aquaculture-the fastest growing food production sector. P can also be a source of environmental contamination and eutrophication if mistreated. Fish assimilate only 20-40% of the applied P; the rest is released into the water. The goals of this research were to study the fate of P in a novel intensive near-zero discharge (<1%) recirculating aquaculture system (RAS). We also tested means to recover and reuse the removed P. Water, sludge and the microbial communities in the different treatment units of the system were analyzed. The treated sludge was tested as a potential substitute for P fertilization in a planter experiment. Of the applied P, 29.5% was recovered by fish, 69.8% was found in the fish sludge and 3.8% was released into the water as soluble reactive P. The P concentration in the fish tank remained stable, likely due to its uptake by denitrifying polyphosphate-accumulating organisms and its precipitation in the RAS's anaerobic reactor. Thus, only 1.5% of the applied P was discharged as effluent, and 69% recovered. The dominant minerals were from the apatite group, followed by the struvite family. Differences in mineral abundance between thermodynamic prediction and actual findings were most probably due to biomineralization by bacteria. Similar plant biomass was recorded for the commercial and digested-sludge fertilization treatments. Biological P removal and recovery from RAS was successfully studied and demonstrated.
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Affiliation(s)
- Uri Yogev
- Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 8499000, Israel
| | - Maximilian Vogler
- Bauhaus-Universität Weimar, Bauhaus-Institute for Infrastructure Solutions, Coudraystr. 7, 99423 Weimar, Germany
| | - Oded Nir
- Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 8499000, Israel
| | - Jörg Londong
- Bauhaus-Universität Weimar, Bauhaus-Institute for Infrastructure Solutions, Coudraystr. 7, 99423 Weimar, Germany
| | - Amit Gross
- Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 8499000, Israel.
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169
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Combined Effect of Colloids and SMP on Membrane Fouling in MBRs. MEMBRANES 2020; 10:membranes10060118. [PMID: 32517262 PMCID: PMC7344963 DOI: 10.3390/membranes10060118] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 06/03/2020] [Accepted: 06/04/2020] [Indexed: 02/04/2023]
Abstract
Membrane fouling investigations in membrane bioreactors (MBRs) are a top research issue. The aim of this work is to study the combined effect of colloids and soluble microbial products (SMPs) on membrane fouling. Two lab-pilot MBRs were investigated for treating two types of wastewater (wwt), synthetic and domestic. Transmembrane pressure (TMP), SMP, particle size distribution and treatment efficiency were evaluated. Chemical Oxygen Demand (COD) removal and nitrification were successful for both kinds of sewage reaching up to 95–97% and 100%, respectively. Domestic wwt presented 5.5 times more SMP proteins and 11 times more SMP carbohydrates compared to the synthetic one. In contrast, synthetic wwt had around 20% more colloids in the mixed liquor with a size lower than membrane pore size (<400 nm) than domestic. Finally, the TMP at 36 days reached 16 kPa for synthetic wwt and 11 kPa for domestic. Therefore, synthetic wwt, despite its low concentration of SMPs, caused severe membrane fouling compared to domestic, a result that is attributed to the increased concentration of colloids. Consequently, the quantity of colloids and possibly their special characteristics play decisive and more important roles in membrane fouling compared to the SMP—a novel conclusion that can be used to mitigate membranes fouling.
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170
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Teng J, Shen L, Xu Y, Chen Y, Wu XL, He Y, Chen J, Lin H. Effects of molecular weight distribution of soluble microbial products (SMPs) on membrane fouling in a membrane bioreactor (MBR): Novel mechanistic insights. CHEMOSPHERE 2020; 248:126013. [PMID: 32004890 DOI: 10.1016/j.chemosphere.2020.126013] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 01/12/2020] [Accepted: 01/22/2020] [Indexed: 06/10/2023]
Abstract
While molecular weight distribution (MWD) is one of the most important properties of soluble microbial products (SMPs), mechanisms underlying effects of MWD of SMPs on membrane fouling have not well unveiled. In this study, it was found that, the supernatant of sludge suspension in a membrane bioreactor (MBR) for wastewater treatment can be fractionated into a series of SMPs samples with different molecular weight (MW) fraction. The real gel sample mainly formed by the rejected SMPs on membrane surface had a high specific filtration resistance (SFR) of 1.21 × 1016 m-1 kg-1. The SFR of SMPs samples and the model foulants of polyethylene glycol (PEG) increased with their MW. The change trend of SFR with MW cannot be sufficiently explained by three-dimensional excitation-emission matrix (EMM) and chemical compositions. Tyndall effect analysis indicated that gelating ability of SMPs and PEG in the solution increased with their MW. Scanning electron microscope (SEM) confirmed gel structure changes with the PEG MW. Accordingly, mechanisms based on Carman-Kozeny equation and Flory-Huggins lattice theory were proposed to interpret SFR of SMPs with low and high MW, respectively. Simulating these two mechanistic models on PEG samples resulted in the comparable SFR data to the experimental ones, indicating the correctness and feasibility of the proposed mechanisms. The proposed mechanisms provided in-depth understanding of membrane fouling regarding MW, facilitating to develop effective membrane fouling mitigation strategies.
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Affiliation(s)
- Jiaheng Teng
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Liguo Shen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Yanchao Xu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Yifeng Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Xi-Lin Wu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Yiming He
- Department of Materials Science and Engineering, Zhejiang Normal University, Jinhua, 321004, China
| | - Jianrong Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
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171
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Sun T, Liu Y, Shen L, Xu Y, Li R, Huang L, Lin H. Magnetic field assisted arrangement of photocatalytic TiO2 particles on membrane surface to enhance membrane antifouling performance for water treatment. J Colloid Interface Sci 2020; 570:273-285. [DOI: 10.1016/j.jcis.2020.03.008] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 12/22/2022]
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172
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Turan NB, Chormey DS, Sari Erkan H, Caglak A, Saral M, Bakirdere S, Engin GO. Preliminary study testing the effects of tea and coffee on sludge characteristics and N-butyryl-l-homoserine lactone in an MBR system. ENVIRONMENTAL TECHNOLOGY 2020; 41:2085-2095. [PMID: 30513046 DOI: 10.1080/09593330.2018.1555612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 11/29/2018] [Indexed: 06/09/2023]
Abstract
Membrane bioreactors (MBRs) are rapidly developing systems widely used for the treatment of municipal and industrial wastewater prior to their discharge into the environment. Membrane fouling is the most important challenge in MBRs, because it negatively affects membrane performance, resulting in low permeate flux, higher transmembrane pressure and frequent membrane cleaning/replacement. In this study, the effect of tea and coffee on sludge characteristics, membrane fouling and the bacterial signalling molecule N-butyryl-l-homoserine lactone (C4-HSL) in a membrane bioreactor system were investigated. For this purpose, four different continuously operated membrane bioreactors, treating synthetic domestic wastewater and dairy wastewater were operated in parallel under the same conditions. The results indicated that the soluble microbial products (SMP) and the extracellular polymeric substances (EPS) in the reactors showed similar trends for both synthetic domestic and dairy wastewater, where protein levels were higher than carbohydrate levels. Other parameters such as floc size, zeta potential, hydrophobicity, sludge volume index and capillary suction time were also analysed prior to and after the addition of coffee and tea. Analysis of the wastewater samples by GC-MS revealed that coffee and tea significantly enhance the extraction efficiency of C4-HSL. The results obtained in this study can serve as a good basis for further research.
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Affiliation(s)
- Nouha Bakaraki Turan
- Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Istanbul, Turkey
| | - Dotse Selali Chormey
- Department of Chemistry, Faculty of Art and Science, Yildiz Technical University, Istanbul, Turkey
| | - Hanife Sari Erkan
- Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Istanbul, Turkey
| | - Abdulkadir Caglak
- Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Istanbul, Turkey
| | - Merve Saral
- Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Istanbul, Turkey
| | - Sezgin Bakirdere
- Department of Chemistry, Faculty of Art and Science, Yildiz Technical University, Istanbul, Turkey
| | - Guleda Onkal Engin
- Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Istanbul, Turkey
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173
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Zheng Y, Zhou Z, Jiang L, Huang J, Jiang J, Chen Y, Shao Y, Yu S, Wang K, Huang J, Wang Z. Evaluating influence of filling fraction of carriers packed in anaerobic side-stream reactors on membrane fouling and microbial community of the coupled membrane bioreactors. JOURNAL OF HAZARDOUS MATERIALS 2020; 388:122030. [PMID: 31954301 DOI: 10.1016/j.jhazmat.2020.122030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 12/29/2019] [Accepted: 01/05/2020] [Indexed: 06/10/2023]
Abstract
An anoxic/oxic membrane bioreactors (AO-MBR) and three identical anaerobic side-stream reactor coupled with anoxic/oxic membrane bioreactors (ASSR-MBR) were constructed and operated in parallel to investigate the appropriate filling fraction of carriers packed in ASSR, influences on pollutants removal, sludge reduction, membrane fouling and microbial community of ASSR-MBR. Inserting ASSR achieved efficient COD removal and nitrification, and packing carriers in ASSR obtained the highest sludge reduction efficiency of 50.5 % at filling fraction of 25 %. Compared to AO-MBR, inserting ASSR without carriers induced the release of viscous components in extracellular polymeric substances (EPS) and the formation of calcium carbonate-related bacteria on membrane surface, and thus deteriorated membrane fouling. Packing carriers with 25 % filling fraction promoted the hydrolysis of soluble microbial products and EPS, whilst reduced the viscoelasticity of sludge flocs. Higher filling fraction of 50 % increased the shear forces to the biofilm and biomarkers related to membrane fouling, and thus showed little improvement to alleviate membrane fouling. MiSeq sequencing revealed that although it enriched in the bulk sludge of conventional ASSR-MBR and the coupled reactor with filling fraction of 50 %, the floc-forming, hydrolytic and fermentative bacteria were more inclined to attach on the membrane surface and alleviate fouling process.
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Affiliation(s)
- Yue Zheng
- Shanghai Engineering Research Center of Energy, Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Zhen Zhou
- Shanghai Engineering Research Center of Energy, Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
| | - Lingyan Jiang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China
| | - Jing Huang
- Shanghai Engineering Research Center of Energy, Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Jie Jiang
- Shanghai Engineering Research Center of Energy, Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Yirong Chen
- Shanghai Engineering Research Center of Energy, Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Yanjun Shao
- Shanghai Engineering Research Center of Energy, Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Siqi Yu
- Shanghai Engineering Research Center of Energy, Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Kaichong Wang
- Shanghai Engineering Research Center of Energy, Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Jianping Huang
- Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China
| | - Zhiwei Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China
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174
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Shen L, Huang Z, Liu Y, Li R, Xu Y, Jakaj G, Lin H. Polymeric Membranes Incorporated With ZnO Nanoparticles for Membrane Fouling Mitigation: A Brief Review. Front Chem 2020; 8:224. [PMID: 32322573 PMCID: PMC7156636 DOI: 10.3389/fchem.2020.00224] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 03/09/2020] [Indexed: 12/24/2022] Open
Abstract
Due to the flexibility of operation, high removal ability, and economic cost, separation membranes have proved to be one of the most significant technologies in various aspects including water treatment. However, membrane fouling is a predominant barrier which is severely limiting the whole membrane industry. To mitigate membrane fouling, researchers have carried out several modification strategies including the incorporation of hydrophilic inorganic components. Zinc oxide (ZnO) nanoparticles, known as a low-cost, environment-friendly, and hydrophilic inorganic material, have been used by worldwide researchers. As claimed by the scientific literatures, ZnO nanoparticles can not only endow the polymeric membranes with antifouling performance but also supply a photocatalytic self-cleaning ability. Therefore, polymer-ZnO composite membranes were considered to be an attractive hot topic in membrane technology. In the last decades, it has been significantly matured by a large mass of literature reports. The current review highlights the latest findings in polymeric membranes incorporated with ZnO nanoparticles for membrane fouling mitigation. The membrane fouling, ZnO nanoparticles, and modification technology were introduced in the first three sections. Particularly, the review makes a summary of the reports of polyvinylidene fluoride (PVDF)-ZnO composite membranes, polyethersulfone (PES)-ZnO composite membranes, and other composite membranes incorporated with ZnO nanoparticles. This review further points out several crucial topics for the future development of polymer-ZnO composite membranes.
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Affiliation(s)
- Liguo Shen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, China
| | - Zhengyi Huang
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, China
| | - Ying Liu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, China
| | - Renjie Li
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, China
| | - Yanchao Xu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, China
| | - Gjon Jakaj
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, China
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, China
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175
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Rao L, Tang J, Hu S, Shen L, Xu Y, Li R, Lin H. Inkjet printing assisted electroless Ni plating to fabricate nickel coated polypropylene membrane with improved performance. J Colloid Interface Sci 2020; 565:546-554. [DOI: 10.1016/j.jcis.2020.01.069] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 01/16/2020] [Accepted: 01/17/2020] [Indexed: 10/25/2022]
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176
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177
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Alizad Oghyanous F, Etemadi H, Yegani R. Foaming control and determination of biokinetic coefficients in membrane bioreactor system under various organic loading rate and sludge retention time. Biochem Eng J 2020. [DOI: 10.1016/j.bej.2020.107491] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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178
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Silva AFR, Magalhães NC, Cunha PVM, Amaral MCS, Koch K. Influence of COD/SO 42- ratio on vinasse treatment performance by two-stage anaerobic membrane bioreactor. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 259:110034. [PMID: 31932266 DOI: 10.1016/j.jenvman.2019.110034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 12/21/2019] [Accepted: 12/22/2019] [Indexed: 06/10/2023]
Abstract
Vinasse is sulfate-rich wastewater due to sulfuric acid dosage in some ethanol production steps. The vinasse sulfate concentration is subject to seasonal variations. A two-stage anaerobic membrane bioreactor (2S-AnMBR) was operated to evaluate the influence of COD/SO42- ratio on vinasse treatment performance by using a real vinasse sample under natural seasonal COD/SO42- variation. This ratio directly affects the sulfidogenesis efficiency, which is responsible for different forms of inhibition in the anaerobic treatment of sulfate-rich wastewater. The bioreactor presented a stable performance at the highest COD/SO42- ratios (50-94), with high removal of chemical oxygen demand (COD) (97.5 ± 0.4%) and volatile fatty acids (VFA) (98.0 ± 0.6%), but low removal of sulfate (69.9 ± 9.5%), indicating lower sulfate reducing bacteria (SRB) activity. In the lowest COD/SO42- ratios (9-20), a deterioration in the removal of organic matter (87.0 ± 1.3%) and VFA (69.8 ± 15.5%) was observed, accompanied by sulfate removal increase (92.9 ± 2.6%). A significant correlation between COD fractions removed via methanogenesis and sulfidogenesis and the COD/SO42- ratio was found, indicating that the increase of this ratio is beneficial to the methanogenic archaea activity. The occurrence of sulfidogenesis, favored by the lower COD/SO42- ratios, induced the microbial soluble products (SMP) and extracellular polymeric substances (EPS) release and protein/carbohydrate ratio increase in the mixed liquor, contributing to the filtration resistance increase.
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Affiliation(s)
- Ana Flávia Rezende Silva
- Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil.
| | - Natalie Cristine Magalhães
- Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Paulo Vitor Martinelli Cunha
- Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | - Konrad Koch
- Chair of Urban Water Systems Engineering, Department of Civil, Geo and Environmental Engineering, Technical University of Munich, Munich, Germany
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179
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Turan NB, Erkan HS, Chormey DS, Cağlak A, Bakirdere S, Engin GO. Feasibility Studies on the Effect of Natural Plant Compounds on Sludge Characteristics in a Batch-Type Aerobic Reactor and N-butyryl-L Homoserine Lactone. ANAL LETT 2020. [DOI: 10.1080/00032719.2020.1745222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Nouha Bakaraki Turan
- Faculty of Civil Engineering, Department of Environmental Engineering, Yildiz Technical University, Esenler, Istanbul, Turkey
| | - Hanife Sari Erkan
- Faculty of Civil Engineering, Department of Environmental Engineering, Yildiz Technical University, Esenler, Istanbul, Turkey
| | - Dotse Selali Chormey
- Faculty of Art and Science, Department of Chemistry, Yildiz Technical University, Esenler, Istanbul, Turkey
| | - Abdulkadir Cağlak
- Faculty of Civil Engineering, Department of Environmental Engineering, Yildiz Technical University, Esenler, Istanbul, Turkey
| | - Sezgin Bakirdere
- Faculty of Art and Science, Department of Chemistry, Yildiz Technical University, Esenler, Istanbul, Turkey
| | - Guleda Onkal Engin
- Faculty of Civil Engineering, Department of Environmental Engineering, Yildiz Technical University, Esenler, Istanbul, Turkey
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180
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Wang Y, Qiu B, Fan S, Liu J, Qin Y, Jian S, Wang Y, Xiao Z. Membrane Distillation of Butanol from Aqueous Solution with Polytetrafluoroethylene Membrane. Chem Eng Technol 2020. [DOI: 10.1002/ceat.201900484] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yuyang Wang
- Sichuan UniversitySchool of Chemical Engineering No. 24 South Section 1, Yihuan Road 610065 Chengdu China
| | - Boya Qiu
- Sichuan UniversitySchool of Chemical Engineering No. 24 South Section 1, Yihuan Road 610065 Chengdu China
| | - Senqing Fan
- Sichuan UniversitySchool of Chemical Engineering No. 24 South Section 1, Yihuan Road 610065 Chengdu China
| | - Jingyun Liu
- Sichuan UniversitySchool of Chemical Engineering No. 24 South Section 1, Yihuan Road 610065 Chengdu China
| | - Yangmei Qin
- Sichuan UniversitySchool of Chemical Engineering No. 24 South Section 1, Yihuan Road 610065 Chengdu China
| | - Shizhao Jian
- Sichuan UniversitySchool of Chemical Engineering No. 24 South Section 1, Yihuan Road 610065 Chengdu China
| | - Yinan Wang
- Sichuan UniversitySchool of Chemical Engineering No. 24 South Section 1, Yihuan Road 610065 Chengdu China
| | - Zeyi Xiao
- Sichuan UniversitySchool of Chemical Engineering No. 24 South Section 1, Yihuan Road 610065 Chengdu China
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181
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Tian X, Song Y, Xi H, Shen Z, Zhou Y, Wang K. Inhibition and removal of trichloroacetaldehyde by biological acidification with glucose co-metabolism. JOURNAL OF HAZARDOUS MATERIALS 2020; 386:121796. [PMID: 31901546 DOI: 10.1016/j.jhazmat.2019.121796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/28/2019] [Accepted: 11/29/2019] [Indexed: 06/10/2023]
Abstract
Biological acidification plays a crucial role in biological removal of organic compounds during petrochemical wastewater treatment. Trichloroacetaldehyde is a typical organic pollutant in petrochemical wastewater, however, no studies have been conducted on its effect on biological acidification. In this study, batch bioassays of volatile fatty acids were conducted to explore the inhibitory effect of trichloroacetaldehyde on biological acidification, the variations of key enzymes and extracellular polymeric substances under trichloroacetaldehyde shock, and the mechanism of trichloroacetaldehyde removal. The results of these bioassays indicated that trichloroacetaldehyde inhibited the acid yield at higher concentrations (EC50 112.20 mg/L), and butyric fermentation was predominant. Moreover, the contents of extracellular polymeric substances and several key acidifying enzymes greatly decreased when the trichloroacetaldehyde concentration exceeded 100 mg/L, which was due to the toxicity that trichloroacetaldehyde poses to the microbes involved in biological acidification. The trichloroacetaldehyde mechanism was as follows: first, trichloroacetaldehyde was adsorbed by extracellular polymeric substances and anaerobic granular sludge, and then transformed into trichloroethanol, trichloroethane, dichloroacetaldehyde, and dichloroethanol under the combined action of the aldehyde reductase and reductive dehalogenases secreted from the microbial consortium. The ability of biological acidification to remove trichloroacetaldehyde was limited; therefore, trichloroacetaldehyde should be pretreated before it enters biological treatment systems.
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Affiliation(s)
- Xiangmiao Tian
- School of Environment, Tsinghua University, Beijing, 100084, PR China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China
| | - Yudong Song
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China
| | - Hongbo Xi
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China
| | - Zhiqiang Shen
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
| | - Yuexi Zhou
- School of Environment, Tsinghua University, Beijing, 100084, PR China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, PR China; Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
| | - Kaijun Wang
- School of Environment, Tsinghua University, Beijing, 100084, PR China.
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182
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Gkotsis P, Zouboulis A, Mitrakas M. Using Additives for Fouling Control in a Lab-Scale MBR; Comparing the Anti-Fouling Potential of Coagulants, PAC and Bio-Film Carriers. MEMBRANES 2020; 10:membranes10030042. [PMID: 32178462 PMCID: PMC7143806 DOI: 10.3390/membranes10030042] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 03/06/2020] [Accepted: 03/11/2020] [Indexed: 11/16/2022]
Abstract
This study investigates the effect of different additives, such as coagulants/flocculants, adsorption agents (powdered activated carbon, PAC), and bio-film carriers, on the fouling propensity of a lab-scale membrane bio-reactor (MBR) treating synthetic municipal wastewater. The coagulation agents FO 4350 SSH, Adifloc KD 451, and PAC1 A9-M at concentrations of 10 mg/L, 10 mg/L, and 100 mg Al/L, respectively, and PAC at a concentration of 3.6 ± 0.1 g/L, exhibited the best results during their batch-mode addition to biomass samples. The optimal additives FO 4350 SSH and Adifloc KD 451 were continuously added to the bioreactor at continuous-flow addition experiments and resulted in increased membrane lifetime by 16% and 13%, respectively, suggesting that the decrease of SMPc concentration and the increase of sludge filterability is the dominant fouling reduction mechanism. On the contrary, fouling reduction was low when PAC1 A9-M and PAC were continuously added, as the membrane lifetime was increased by approximately 6%. Interestingly, the addition of bio-film carriers (at filling ratios of 40%, 50%, and 60%) did not affect SMPc concentration, sludge filterability, and trans-membrane pressure (TMP). Finally, the effluent quality was satisfactory in terms of organics and ammonia removal, as chemical oxygen demand (COD), biochemical oxygen demand (BOD)5, and ΝΗ-N concentrations were consistently below the permissible discharge limits and rarely exceeded 30, 15, and 0.9 mg/L, respectively.
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Affiliation(s)
- Petros Gkotsis
- Laboratory of Chemical and Environmental Technology, Department of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (P.G.); (A.Z.)
| | - Anastasios Zouboulis
- Laboratory of Chemical and Environmental Technology, Department of Chemistry, Faculty of Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (P.G.); (A.Z.)
| | - Manassis Mitrakas
- Analytic Chemistry Laboratory, Department of Chemical Engineering, School of Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
- Correspondence: ; Tel.: +30-2310-997-794
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183
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Jafari S, Salehiziri M, Foroozesh E, Bardi MJ, Rad HA. An evaluation of lysozyme enzyme and thermal pretreatments on dairy sludge digestion and gas production. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 81:1052-1062. [PMID: 32541121 DOI: 10.2166/wst.2020.198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Anaerobic digestion is one of the common methods of managing and stabilizing sludge. However, due to the limitations of the biological sludge hydrolysis stage, anaerobic decomposition is slow and requires a long time. This study evaluated the effects of thermal (80 °C) (TH-PRE) and a combination of thermal with the lysozyme enzyme (LTH-PRE) pretreatments on the enhancement of anaerobic activated sludge digestion. Response surface methodology was implemented to optimize enzyme pretreatment conditions (enzyme and mixed liquid suspended solids concentration). The results showed that both pretreatment methods increase soluble chemical oxygen demand (COD) and reduces total and volatile suspended solids (VSS), and phosphate concentration. The COD removal rate in LTH-PRE and TH-PRE was 95% and 81%, respectively. The value of VSS reduction in LTH-PRE and TH-PRE was 41% and 31%, more than the control operation, respectively. The biogas production in LTH-PRE and in TH-PRE also increased by 124% and 96%, respectively.
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Affiliation(s)
- Shakiba Jafari
- Babol Noshirvani University of Technology, Bobol, Iran E-mail:
| | | | - Elham Foroozesh
- Babol Noshirvani University of Technology, Bobol, Iran E-mail:
| | | | - Hasan A Rad
- Babol Noshirvani University of Technology, Bobol, Iran E-mail:
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184
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Maqbool T, Cho J, Shin KH, Hur J. Using stable isotope labeling approach and two dimensional correlation spectroscopy to explore the turnover cycles of different carbon structures in extracellular polymeric substances. WATER RESEARCH 2020; 170:115355. [PMID: 31811990 DOI: 10.1016/j.watres.2019.115355] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/27/2019] [Accepted: 11/29/2019] [Indexed: 06/10/2023]
Abstract
Extracellular polymeric substances (EPS) from activated sludge comprise many organic constituents with polysaccharides and proteins as the main components of two different functionalities. Despite a number of previous EPS studies, a fundamental question remained unanswered, namely, whether the different EPS components would have the same turnover cycle (i.e., formation/dissolution) in biological wastewater treatment systems. In this study, we employed a stable isotope labeling approach based on isotope-enriched substrates (i.e., 13C-glucose and 15NH4Cl) to examine the potential discrepancies in the turnover cycles among different major EPS constituents. Our results, based on substrate consumption in a batch bioreactor, evidenced the existence of differences in carbon and nitrogen cycles within bulk EPS with an earlier replenishment of organic carbon relative to organic nitrogen. The changes in the 13C nuclear magnetic resonance (13C NMR) spectra of EPS with operation clarified the relative differences in the turnover periods among several identified EPS structures with different chemical functionalities. Two-dimensional correlation spectroscopy (2D-COS) on the 13C NMR spectra further showed that the substrate-assimilated carbon functional groups appear to preferably formed within bulk EPS in the order of O-alkyl carbons > amides > α amino acids > aliphatic carbons. This study provides a novel insight into the dissimilar formation rates of different EPS structures after substrate assimilation. This isotope labeling approach can be further applied to determine the mass balance among the substrate, biomass, and bound/soluble EPS within activated sludge systems.
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Affiliation(s)
- Tahir Maqbool
- Department of Environment and Energy, Sejong University, Seoul, 05006, South Korea
| | - Jinwoo Cho
- Department of Environment and Energy, Sejong University, Seoul, 05006, South Korea
| | - Kyung Hoon Shin
- Department of Environmental Marine Sciences, Hanyang University, Ansan, Gyeonggi do, 15588, South Korea
| | - Jin Hur
- Department of Environment and Energy, Sejong University, Seoul, 05006, South Korea.
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185
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Yu W, Liu Y, Shen L, Xu Y, Li R, Sun T, Lin H. Magnetic field assisted preparation of PES-Ni@MWCNTs membrane with enhanced permeability and antifouling performance. CHEMOSPHERE 2020; 243:125446. [PMID: 31995891 DOI: 10.1016/j.chemosphere.2019.125446] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 11/17/2019] [Accepted: 11/21/2019] [Indexed: 06/10/2023]
Abstract
Multiple wall carbon nanotubes (MWCNTs), as an excellent material, have been used in various applications including preparation of polymer-MWCNTs composite membranes. However, few reports have combined the magnetic Ni@MWCNTs with polyether sulfone (PES) membrane to improve its antifouling performance to humic acid (HA), sodium alginate (SA), bovine serum albumin (BSA) and yeast (YE) solutions. In this study, the Ni@MWCNTs was generated by immersing MWCNTs into Ni2+ solution where in-situ reduction reaction was launched by the adsorbed Ag+ on MWCNTs. Since the loaded Ni endowed magnetism to MWCNTs, the Ni@MWCNTs can be easily attracted onto the membrane surface by an external magnetic field during the phase inversion process. The morphology measurements confirmed that the Ni@MWCNTs headed out of the PES-Ni@MWCNTs membrane surface. Because the MWCNTs played a role of free channels for water molecules, the composite membrane water flux reached to threefold flux of the pristine membrane. Moreover, the PES-Ni@MWCNTs membranes displayed the obviously enhanced antifouling ability during all the three alternative filtration cycles of water and BSA, SA, YE and HA solutions. In addition, the optimal PES-Ni@MWCNTs membrane demonstrated a flux recovery rate (FRR) of 67.89%, 85.53%, 60.28 and 90.12% for BSA, SA, YE and HA, respectively, which were not only much higher than that of the pristine membrane, but also exhibited significant improvements comparing with the previous studies. Further results of extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory indicated that the modified membrane possessed advantageous interaction energies with contaminant molecules over the pristine membrane.
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Affiliation(s)
- Weiming Yu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China.
| | - Ying Liu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China.
| | - Liguo Shen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China.
| | - Yanchao Xu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China.
| | - Renjie Li
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China.
| | - Tianyu Sun
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China.
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China.
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186
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Long Y, You X, Chen Y, Hong H, Liao BQ, Lin H. Filtration behaviors and fouling mechanisms of ultrafiltration process with polyacrylamide flocculation for water treatment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 703:135540. [PMID: 31761369 DOI: 10.1016/j.scitotenv.2019.135540] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/05/2019] [Accepted: 11/13/2019] [Indexed: 05/09/2023]
Abstract
This study aims to investigate thermodynamic mechanisms of filtration behaviors of ultrafiltration (UF) process with polyacrylamide (PAM) flocculation for surface water treatment, which has not been investigated previously. It was interestingly found that, filtration of durably mixed sodium alginate (SA) solution corresponded to an extraordinarily high specific filtration resistance (SFR) (3.28 × 1014 m·kg-1 without polyacrylamide addition) and a V-shaped profile of SFR characterized by a sharp fall followed by a correspondingly sharp rise along with the increase in PAM addition concentration. Experimental characterizations suggested that, membrane fouling was mainly caused by the gel layer formation rather than the pore clogging and cake/floc formation. Rather than the chemical composition change, the changes of the solution physicochemical properties (pH and zeta potential) and foulant morphology are associated with above-mentioned interesting filtration behaviors. Accordingly, the thermodynamic mechanisms of the filtration behaviors were proposed. It was proposed that, the thermodynamics of polymeric network described by the Flory-Huggins lattice theory were responsible for the extraordinarily high SFR of SA gel layer. Low dosage of PAM addition decreased the negative zeta potential and homogeneity of the gel system, causing the reduced SFR. In contrast, further PAM addition increased the negative zeta potential and homogeneity of the gel system, and then increased the SFR of the gel layer. These results reasonably explained the V-shaped profile of SFR. This study provided significant insights into the effects of PAM addition on ultrafiltration behaviors of alginate solution.
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Affiliation(s)
- Ying Long
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
| | - Xiujia You
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
| | - Yifeng Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
| | - Huachang Hong
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
| | - Bao-Qiang Liao
- Department of Chemical Engineering, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
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187
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A Review on the Mechanism, Impacts and Control Methods of Membrane Fouling in MBR System. MEMBRANES 2020; 10:membranes10020024. [PMID: 32033001 PMCID: PMC7073750 DOI: 10.3390/membranes10020024] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Revised: 01/29/2020] [Accepted: 01/30/2020] [Indexed: 12/26/2022]
Abstract
Compared with the traditional activated sludge process, a membrane bioreactor (MBR) has many advantages, such as good effluent quality, small floor space, low residual sludge yield and easy automatic control. It has a promising prospect in wastewater treatment and reuse. However, membrane fouling is the biggest obstacle to the wide application of MBR. This paper aims at summarizing the new research progress of membrane fouling mechanism, control, prediction and detection in the MBR systems. Classification, mechanism, influencing factors and control of membrane fouling, membrane life prediction and online monitoring of membrane fouling are discussed. The research trends of relevant research areas in MBR membrane fouling are prospected.
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188
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Insights into membrane fouling implicated by physical adsorption of soluble microbial products onto D3520 resin. Chin J Chem Eng 2020. [DOI: 10.1016/j.cjche.2019.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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189
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Zhang Y, Wang Y, Cao X, Xue J, Zhang Q, Tian J, Li X, Qiu X, Pan B, Gu AZ, Zheng X. Effect of carboxyl and hydroxyl groups on adsorptive polysaccharide fouling: A comparative study based on PVDF and graphene oxide (GO) modified PVDF surfaces. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2019.117514] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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190
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Recent advances in functionalized polymer membranes for biofouling control and mitigation in forward osmosis. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2019.117604] [Citation(s) in RCA: 89] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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191
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Zhang K, Zhang ZH, Wang H, Wang XM, Zhang XH, Xie YF. Synergistic effects of combining ozonation, ceramic membrane filtration and biologically active carbon filtration for wastewater reclamation. JOURNAL OF HAZARDOUS MATERIALS 2020; 382:121091. [PMID: 31472465 DOI: 10.1016/j.jhazmat.2019.121091] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Revised: 08/19/2019] [Accepted: 08/23/2019] [Indexed: 06/10/2023]
Abstract
In this study, we proposed to apply an integrated process which is comprised of in situ ozonation, ceramic membrane filtration (CMF) and biologically active carbon (BAC) filtration to wastewater reclamation for indirect potable reuse purpose. A pilot-scale (20 m3/d) experiment had been run for ten months to validate the prospect of the process in terms of treatment performance and operational stability. Results showed that the in situ O3 + CMF + BAC process performed well in pollutant removal, with chemical oxygen demand, ammonia, nitrate nitrogen, total phosphorus and turbidity levels in the treated water being 5.1 ± 0.9, 0.05 ± 0.01, 10.5 ± 0.8, <0.06 mg/L, and <0.10 NTU, respectively. Most detected trace organic compounds were degraded by>96%. This study demonstrated that synergistic effects existed in the in situ O3 + CMF + BAC process. Compared to pre-ozonation, in situ ozonation in the membrane tank was more effective in controlling membrane fouling (maintaining operational stability) and in degrading organic pollutants, which could be attributed to the higher residual ozone concentration in the tank. Because of the removal of particulate matter by CMF, water head loss of the BAC filter increased slowly and prolonged the backwashing interval to 30 days. BAC filtration was also effective in removing ammonia and N-nitrosodimethylamine from the ozonated water.
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Affiliation(s)
- Kai Zhang
- Institute for Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Guangdong, 518055, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Zheng-Hua Zhang
- Institute for Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Guangdong, 518055, China
| | - Hao Wang
- Beijing Drainage Group Co., Ltd, Beijing, 100124, China
| | - Xiao-Mao Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
| | - Xi-Hui Zhang
- Institute for Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Guangdong, 518055, China; Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Guangdong, 518055, China.
| | - Yuefeng F Xie
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Environmental Engineering Programs, Pennsylvania State University, Middletown, PA, 17057, USA
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192
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Choi OK, Hendren Z, Kim GD, Dong D, Lee JW. Influence of activated sludge derived-extracellular polymeric substance (ASD-EPS) as bio-flocculation of microalgae for biofuel recovery. ALGAL RES 2020. [DOI: 10.1016/j.algal.2019.101736] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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193
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Cheng H, Li Y, Kato H, Li YY. Enhancement of sustainable flux by optimizing filtration mode of a high-solid anaerobic membrane bioreactor during long-term continuous treatment of food waste. WATER RESEARCH 2020; 168:115195. [PMID: 31639590 DOI: 10.1016/j.watres.2019.115195] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 09/26/2019] [Accepted: 10/14/2019] [Indexed: 06/10/2023]
Abstract
Membrane fouling or flux limitation is the major bottleneck that hinders anaerobic membrane bioreactor (AnMBR) application. An AnMBR with a working volume of 15 L was operated for 180 days to investigate the maximum sustainable flux at different high solid concentrations during the anaerobic treatment of food waste. A total of eight filtration-to-relaxation (F/R) ratios were incorporated, with a fixed filtration time of 3 min and varied relaxation times (decreased from 12 to 1 min). Besides, a total of five instantaneous fluxes were applied: 12, 14, 16, 18 and 20 L/m2/h (LMH). Results showed that sustainable flux was greatly enhanced by filtration mode optimization. The optimal F/R ratios were 3:1, 3:1, 3:1 and 3:6 at mixed liquor total solid (MLTS) concentrations of 10, 15, 20 and 25 g/L, respectively. The corresponding sustainable flux values were 13.2 ± 0.3, 10.1 ± 0.4, 9.3 ± 0.2 and 4.0 ± 0.3 LMH, respectively. These values were 29%, 35%, 52% and 21% higher than the critical flux determined by the flux-stepping technique. The results of this study were used to perform a mathematical simulation. The obtained regression equation between the maximum sustainable flux and MLTS concentration can be used to predict the sustainable flux at other MLTS concentrations. This work provides valuable insight into the design and operation of high-solid AnMBRs, and is expected to contribute to further advances in the application of AnMBRs in industry.
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Affiliation(s)
- Hui Cheng
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi, 980-8579, Japan
| | - Yemei Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi, 980-8579, Japan
| | - Hiroyuki Kato
- New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aoba, Aramaki-Aza, Sendai, Miyagi, 980-8579, Japan
| | - Yu-You Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi, 980-8579, Japan; Department of Frontier Sciences for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, 6-6-20 Aoba, Aramaki-Aza, Sendai, Miyagi, 980-8579, Japan.
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194
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Zhang H, Wang H, Jie M, Zhang K, Qian Y, Ma J. Performance and microbial communities of different biofilm membrane bioreactors with pre-anoxic tanks treating mariculture wastewater. BIORESOURCE TECHNOLOGY 2020; 295:122302. [PMID: 31678888 DOI: 10.1016/j.biortech.2019.122302] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 10/16/2019] [Accepted: 10/17/2019] [Indexed: 06/10/2023]
Abstract
The performance of pollutant removals, activated sludge characteristics, and microbial communities of two biofilm membrane bioreactors coupled with pre-anoxic tanks (BF-AO-MBRs) (one using fiber bundle bio-carriers (FB-MBR) and the other using suspended bio-carriers (MB-MBR)) were compared at the salinity between zero and 60 g/L. At all salinities, three bioreactors showed good COD average removal efficiencies (>94.1%), and FB-MBR showed the best TN removal efficiency (90.4% at 30 g/L salinity). Moreover, FB-MBR had the faster process start-up time and better salt shock resistance. At high salinities (30-60 g/L), more extracellular polymeric substances were produced by the BF-AO-MBRs to avoid the penetration of salt and protect the bacterial community. Because of the different attachment patterns of biofilms, the microbial community structure in the FB-MBR exposed to 30 g/L salinity had higher nitrite-oxidizing/ammonia-oxidizing bacteria ratio (6.44) with more abundance of denitrifiers, which contribute to higher TN removal efficiency and lower nitrite accumulation.
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Affiliation(s)
- Huining Zhang
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
| | - Hanqing Wang
- Polytechnic Institute, Zhejiang University, Hangzhou 310000, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
| | - Mengrui Jie
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
| | - Kefeng Zhang
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China.
| | - Yongxing Qian
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
| | - Jianqing Ma
- Ningbo Institute of Technology, Zhejiang University, Ningbo 315000, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology, Ningbo 315100, China
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195
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Manoharan RK, Ayyaru S, Ahn YH. Auto-cleaning functionalization of the polyvinylidene fluoride membrane by the biocidal oxine/TiO2 nanocomposite for anti-biofouling properties. NEW J CHEM 2020. [DOI: 10.1039/c9nj05300j] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The commercial polyvinylidene fluoride (PVDF) polymer was modified with TiO2 nanoparticle-doped oxine to develop an auto-cleaning functionalized hybrid membrane with a long lasting antibiofilm effect.
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Affiliation(s)
| | - Sivasankaran Ayyaru
- Department of Civil Engineering, Yeungnam University, Gyeongsan
- Republic of Korea
| | - Young-Ho Ahn
- Department of Civil Engineering, Yeungnam University, Gyeongsan
- Republic of Korea
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196
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Lei Z, Yang S, Li X, Wen W, Huang X, Yang Y, Wang X, Li YY, Sano D, Chen R. Revisiting the effects of powdered activated carbon on membrane fouling mitigation in an anaerobic membrane bioreactor by evaluating long-term impacts on the surface layer. WATER RESEARCH 2019; 167:115137. [PMID: 31585386 DOI: 10.1016/j.watres.2019.115137] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 09/25/2019] [Accepted: 09/26/2019] [Indexed: 06/10/2023]
Abstract
Two submerged anaerobic membrane bioreactors (AnMBRs) with and without powdered activated carbon (PAC) were studied to revisit the effect of PAC on membrane fouling performance by long-term operation when treating synthetic sewage. The results showed that PAC remained efficient for membrane fouling control after long-term operation (over 140 d), and it reduced the fouling rate at a hydraulic retention time of 8 h from 3.12 to 0.89 kPa/d. PAC mainly mitigated the membrane fouling by restraining the formation of a cake layer while generating a gel layer on the membrane surface, which was attributed to the PAC-induced microbial community change in mixed liquor and the membrane surface. Microbial community analysis indicated the genera Pseudomonas (26.5%) and Methanothrix (79.21%) were the predominant bacteria and archaea, respectively, in the gel layer, and this result is completely different from the presence of a high abundance of Levilinea (7.1%), Aminivibrio (4.9%) and Methanothrix (90.04%) in the cake layer on the membrane surface without PAC. The significant difference in the predominant microbes in the membrane surface layer was attributed to the reduced enrichment of Levilinea and Methanothrix with PAC addition.
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Affiliation(s)
- Zhen Lei
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China
| | - Shuming Yang
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China
| | - Xiang Li
- Architecture Design and Research Institute, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China
| | - Wen Wen
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China
| | - Xingyuan Huang
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China
| | - Yuan Yang
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China
| | - Xiaochang Wang
- International S&T Cooperation Center for Urban Alternative Water Resources Development, Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China
| | - Yu-You Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, 980-8579, Japan
| | - Daisuke Sano
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, 980-8579, Japan
| | - Rong Chen
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China; International S&T Cooperation Center for Urban Alternative Water Resources Development, Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China.
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197
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Ward BJ, Traber J, Gueye A, Diop B, Morgenroth E, Strande L. Evaluation of conceptual model and predictors of faecal sludge dewatering performance in Senegal and Tanzania. WATER RESEARCH 2019; 167:115101. [PMID: 31563707 DOI: 10.1016/j.watres.2019.115101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 09/11/2019] [Accepted: 09/19/2019] [Indexed: 05/06/2023]
Abstract
Unpredictable dewatering performance is a barrier to the effective management and treatment of faecal sludge. While mechanisms of dewatering in sludges from wastewater treatment are well understood, it is not clear how dewatering of faecal sludge fits into the framework of existing knowledge. We evaluate physical-chemical parameters, including EPS and cations, and demographic (source), environmental (microbial community), and technical factors (residence time) as possible predictors of dewatering performance in faecal sludge, and make comparisons to the existing conceptual model for wastewater sludge. Faecal sludge from public toilets took longer to dewater than sludge from other sources, and had turbid supernatant after settling. Slow dewatering and turbid supernatant corresponded to high EPS and monovalent cation concentrations, conductivity, and pH, but cake solids after dewatering was not correlated with EPS or other factors. Faecal sludges with higher EPS appeared less stabilised than those with lower EPS, potentially a result of inhibition of biological degradation due to high urine concentrations. However, distinct microbial community compositions were also observed in samples with higher and lower EPS concentrations. Higher EPS faecal sludge was comparable in dewatering behaviour and EPS content to anaerobically digested and primary wastewater sludges. However lower EPS faecal sludges had different dewatering behaviour than wastewater sludges and may be governed by different mechanisms.
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Affiliation(s)
- Barbara J Ward
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland; Institute of Environmental Engineering, ETH Zurich, 8093, Zurich, Switzerland.
| | - Jacqueline Traber
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland
| | | | - Bécaye Diop
- Delvic Sanitation Initiatives, Dakar, Senegal
| | - Eberhard Morgenroth
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland; Institute of Environmental Engineering, ETH Zurich, 8093, Zurich, Switzerland
| | - Linda Strande
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland
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198
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Li C, Li X, Qin L, Wu W, Meng Q, Shen C, Zhang G. Membrane photo-bioreactor coupled with heterogeneous Fenton fluidized bed for high salinity wastewater treatment: Pollutant removal, photosynthetic bacteria harvest and membrane anti-fouling analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 696:133953. [PMID: 31450050 DOI: 10.1016/j.scitotenv.2019.133953] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 08/15/2019] [Accepted: 08/15/2019] [Indexed: 06/10/2023]
Abstract
In this study, efficient photosynthetic bacteria (PSB)-GO/PVDF membrane photo-bioreactor (MPBR) combined with heterogeneous Fenton fluidized bed was built and successfully applied for treatment of actual refractory seafood-processing wastewater with extremely high salinity. As effective pre-treatment, heterogeneous Fenton was designed for removing non-biodegradable organics and reducing iron-sludge discharge. In MPBR, GO/PVDF membrane fabricated by chemical grafting GO nanosheets was first used for salt-tolerated PSB harvest. Compared with original PVDF membrane, GO/PVDF membrane exhibited enhanced hydrophilicity, better permeability (4.4 times) and attractive flux recover rate (94%), which was attributed to remarkable reduction in hydrophobic proteins amount of extracellular polymeric substances (EPS). Importantly, COD and NH3-N removal efficiency of MPBR with GO/PVDF membrane were kept about 95 and 98%, respectively, and average biomass productivity reached as high as 105 mg/L·d. This study provides a promising and economical way to build efficient MBR combined with new materials for high salinity hazardous wastewater treatment.
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Affiliation(s)
- Chang Li
- Institute of Oceanic and Environmental Chemical Engineering, State Key Lab Breeding Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Chaowang Road 18(#), 310014 Hangzhou, PR China
| | - Xiong Li
- Institute of Oceanic and Environmental Chemical Engineering, State Key Lab Breeding Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Chaowang Road 18(#), 310014 Hangzhou, PR China
| | - Lei Qin
- Institute of Oceanic and Environmental Chemical Engineering, State Key Lab Breeding Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Chaowang Road 18(#), 310014 Hangzhou, PR China
| | - Wei Wu
- Institute of Oceanic and Environmental Chemical Engineering, State Key Lab Breeding Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Chaowang Road 18(#), 310014 Hangzhou, PR China
| | - Qin Meng
- College of Chemical and Biological Engineering, State Key Laboratory of Chemical Engineering, Zhejiang University, Yugu Road 38(#), 310027 Hangzhou, PR China
| | - Chong Shen
- College of Chemical and Biological Engineering, State Key Laboratory of Chemical Engineering, Zhejiang University, Yugu Road 38(#), 310027 Hangzhou, PR China
| | - Guoliang Zhang
- Institute of Oceanic and Environmental Chemical Engineering, State Key Lab Breeding Base of Green Chemical Synthesis Technology, Zhejiang University of Technology, Chaowang Road 18(#), 310014 Hangzhou, PR China.
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199
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Hong PN, Noguchi M, Matsuura N, Honda R. Mechanism of biofouling enhancement in a membrane bioreactor under constant trans-membrane pressure operation. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.117391] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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200
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Yang S, Zhang Q, Lei Z, Wen W, Huang X, Chen R. Comparing powdered and granular activated carbon addition on membrane fouling control through evaluating the impacts on mixed liquor and cake layer properties in anaerobic membrane bioreactors. BIORESOURCE TECHNOLOGY 2019; 294:122137. [PMID: 31536858 DOI: 10.1016/j.biortech.2019.122137] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 09/05/2019] [Accepted: 09/08/2019] [Indexed: 06/10/2023]
Abstract
Concerning the lack of comprehensive study on the impact of powdered and granular activated carbon (PAC and GAC) on AnMBR, their impact on treatment performance, mixed liquor and cake layer properties and membrane fouling behaviors were further investigated. High COD removal efficiencies (>90%) and COD converting to CH4 rates (>70%) were achieved. GAC greatly increased extracellular polymeric substances (EPS) production in mixed liquor, but significantly reduced biosolids deposited on membrane surface; while PAC largely increased proteins and polysaccharides on membrane surface. In addition, PAC decreased, whereas GAC increased particle sizes. Fouling rates showed PAC and GAC addition effectively alleviated membrane fouling at HRT 8 h, and GAC remarkably postponed the occurrence of the transmembrane pressure jump and extended membrane service time. This study clarified the roles of GAC and PAC on membrane fouling control over long-term operation, which provides the basis for decision-making in practical application.
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Affiliation(s)
- Shuming Yang
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China
| | - Qian Zhang
- Architecture Design and Research Institute, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China
| | - Zhen Lei
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China
| | - Wen Wen
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China
| | - Xingyuan Huang
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China
| | - Rong Chen
- Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China; International S&T Cooperation Center for Urban Alternative Water Resources Development, Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, PR China.
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