1
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Bian X, Zhang M, Huang J, Li F, Feng H, Ma J. A comparison study on membrane fouling in A/O-MBR and A/A-MBR at different mixed liquor-suspended solids concentrations. ENVIRONMENTAL TECHNOLOGY 2024:1-11. [PMID: 39172023 DOI: 10.1080/09593330.2024.2394905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Accepted: 07/19/2024] [Indexed: 08/23/2024]
Abstract
Membrane fouling leads to decreased membrane flux, increases the frequency of membrane tissue replacement and membrane cleaning, and increases the operating cost of membrane bioreactor. In this study, the pollutant removal effects, membrane fouling differences and microbial characteristics of anaerobic/aerobic MBR (A/O-MBR) and anaerobic/anoxic MBR (A/A-MBR) were investigated at different mixed liquor suspended solids (MLSS) concentrations. The results showed that the chemical cleaning cycle of membrane contamination was 12, 28, 44 h and 24, 40, 104 h, respectively, and the cycle was prolonged with the increase of MLSS concentration (from 6000 to 9000 mg L-1). A/O-MBR was 1.4-2.4 times the rate of membrane fouling of A/A-MBR. In irreversible resistance, extracellular polymer substances (EPS) were the most significant contributors to membrane fouling. EPS concentration in A/A-MBR (118.33, 73.75, 54.26 mg/gMLSS) was lower than that in A/O-MBR (171.68, 91.92, 62.33 mg/gMLSS). Therefore, increasing MLSS concentration could mitigate membrane fouling. 16S rRNA high-throughput sequencing demonstrated that filamentous bacteria was the primary reason for the membrane fouling difference. Filamentous bacteria were more likely to be attached to the surface of the membrane, causing membrane fouling. The abundance percentage of filamentous bacteria in A/A-MBR was smaller than that in A/O-MBR. In summary, The excellent performance of A/A-MBR in membrane fouling behaviour, resistance analysis, EPS and microorganisms proved that A/A-MBR is more promising than A/O-MBR in wastewater nitrogen and phosphorus removal. This study can provide a theoretical basis for the application of MBR in the field of sewage treatment.
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Affiliation(s)
- Xiaozheng Bian
- School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, People's Republic of China
- Henan Engineering Research Center of Water Pollution and Soil Damage Remediation, Zhengzhou, People's Republic of China
| | - Mengyuan Zhang
- School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, People's Republic of China
| | - Jianping Huang
- School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, People's Republic of China
- Henan Engineering Research Center of Water Pollution and Soil Damage Remediation, Zhengzhou, People's Republic of China
| | - Fongyau Li
- Chemistry department, National University of Singapore, Singapore, Singapore
| | - Huatao Feng
- Chemistry department, National University of Singapore, Singapore, Singapore
| | - Jianqin Ma
- School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, People's Republic of China
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2
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Cao DQ, Jin Y, Liu H, Lei SC, Song YX, Han JL, Hao XD, Ma MG, Zhang Z, Wu R. Concentration properties of biopolymers via dead-end forward osmosis. Int J Biol Macromol 2024; 270:132338. [PMID: 38763237 DOI: 10.1016/j.ijbiomac.2024.132338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2024] [Revised: 04/29/2024] [Accepted: 05/11/2024] [Indexed: 05/21/2024]
Abstract
Extracellular polymeric substances (EPSs) in excess sludge of wastewater treatment plants are valuable biopolymers that can act as recovery materials. However, effectively concentrating EPSs consumes a significant amount of energy. This study employed novel energy-saving pressure-free dead-end forward osmosis (DEFO) technology to concentrate various biopolymers, including EPSs and model biopolymers [sodium alginate (SA), bovine serum albumin (BSA), and a mixture of both (denoted as BSA-SA)]. The feasibility of the DEFO technology was proven and the largest concentration ratios for these biopolymers were 94.8 % for EPSs, 97.1 % for SA, 97.8 % for BSA, and 98.4 % for BSA-SA solutions. An evaluation model was proposed, incorporating the FO membrane's water permeability coefficient and the concentrated substances' osmotic resistance, to describe biopolymers' concentration properties. Irrespective of biopolymer type, the water permeability coefficient decreased with increasing osmotic pressure, remained constant with increasing feed solution (FS) concentration, increased with increasing crossing velocity in the draw side, and showed little dependence on draw salt type. In the EPS DEFO concentration process, osmotic resistance was minimally impacted by osmotic pressure, FS concentration, and crossing velocity, and monovalent metal salts were proposed as draw solutes. The interaction between reverse diffusion metal cations and EPSs affected the structure of the concentrated substances on the FO membrane, thus changing the osmotic resistance in the DEFO process. These findings offer insights into the efficient concentration of biopolymers using DEFO.
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Affiliation(s)
- Da-Qi Cao
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Yau Mathematical Sciences Center, Tsinghua University, Beijing 100084, China.
| | - Yan Jin
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Hui Liu
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Shi-Cheng Lei
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Yi-Xuan Song
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Jia-Lin Han
- Beijing Drainage Group Co. Ltd (BDG), Beijing 100061, China
| | - Xiao-Di Hao
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Ming-Guo Ma
- Research Center of Biomass Clean Utilization, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China
| | - Zhongguo Zhang
- National Engineering Laboratory of Circular Economy, Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing 100095, China
| | - Rongling Wu
- Yau Mathematical Sciences Center, Tsinghua University, Beijing 100084, China; Beijing Institute of Mathematical Sciences and Applications, Beijing 101408, China
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3
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Lin W, Zhang Y, Huang J, Li Z. Fluorescence and pectinase double-triggered chitosan/pectin/calcium propionate/curcumin-β-cyclodextrin complex film for pork freshness monitoring and maintenance. Int J Biol Macromol 2024; 257:128603. [PMID: 38056733 DOI: 10.1016/j.ijbiomac.2023.128603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 11/11/2023] [Accepted: 12/02/2023] [Indexed: 12/08/2023]
Abstract
An intelligent and active food packaging film based on chitosan (CS), pectin (P), calcium propionate (CP), and curcumin-β-cyclodextrin complex (Cur-β-CD) was prepared. The CS/P/CP/Cur-β-CD film exhibited improved hydrophobicity (74.78 ± 0.53°), water vapor (4.55 ± 0.16 × 10-11 g·(m·s·Pa)-1), and oxygen (1.50 ± 0.06 × 10-12 g·(m·s·Pa)-1) barrier properties, as well as antioxidant (72.34 ± 3.79 % for DPPH and 86.05 ± 0.14 % for ABTS) and antibacterial (79.41 ± 2.89 % for E. coli and 83.82 ± 3.96 % for S. aureus) activities. The release of CP and Cur could be triggered by pectinase, with their cumulative release reaching 92.62 ± 1.20 % and 42.24 ± 1.15 %, respectively. The CS/P/CP/Cur-β-CD film showed delayed alterations in surface color, pH value, total volatile bases nitrogen, total viable counts, thiobarbituric acid reactive substance, hardness, and springiness of pork. Additionally, the fluorescence intensity of the film gradually decreased. In conclusion, we have developed a pH-responsive film with pectinase-triggered release function, providing a new concept for the design of multi-signal responsive intelligent food packaging.
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Affiliation(s)
- Wanmei Lin
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, PR China
| | - Yifan Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, PR China
| | - Jihong Huang
- State Key Laboratory of Crop Stress Adaptation and Improvement, College of Agriculture, Henan University, Kaifeng 475004, PR China; School of Food and Pharmacy, Xuchang University, Xuchang 461000, PR China.
| | - Zhonghong Li
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling 712100, Shaanxi, PR China.
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4
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Khan IA, Kim JO. Role of inorganic foulants in the aging and deterioration of low-pressure membranes during the chemical cleaning process in surface water treatment: A review. CHEMOSPHERE 2023; 341:140073. [PMID: 37689156 DOI: 10.1016/j.chemosphere.2023.140073] [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: 07/19/2023] [Revised: 08/31/2023] [Accepted: 09/04/2023] [Indexed: 09/11/2023]
Abstract
Low-pressure membrane (LPM) filtration, including microfiltration (MF) and ultrafiltration (UF), is a promising technology for the treatment of surface water for drinking and other purposes. Various configurations and operational sequences have been developed to ensure the sustainable provision of clean water by overcoming fouling problems. In the literature, various periodic physical and/or chemical approaches to the cleaning of LPMs have been reported, but little data is available on the aging of MF/UF membranes that results from the interaction between the foulants and the cleaning agent. Periodic physical cleaning of the membrane is expected to return the membrane to its original performance capacity, but it only recovers to a certain level because the remaining foulants cause irreversible fouling. Chemical cleaning can then be employed to recover the membrane from this irreversible fouling but, in the process, it can cause irrecoverable damage to the membrane. In this review, the foulants responsible for irrecoverable damage to MF/UF membranes are summarized, and their interaction with cleaning agents and other foulants is described. The impact of these foulants on various membrane parameters, including filtration efficiency, flux decline, permeability, membrane characterization, and membrane integrity are also summarized and discussed in detail. In addition, mitigation options and future prospects are also discussed with regard to increasing the operational life span of a membrane in a cost-effective manner. Ultimately, this review suggests an advanced control system based on membrane-foulant interactions under the impact of various operational parameters to mitigate the integrity loss of membranes.
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Affiliation(s)
- Imtiaz Afzal Khan
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Jong-Oh Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea.
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5
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Agles AA, Bourg IC. Structure-Thermodynamic Relationship of a Polysaccharide Gel (Alginate) as a Function of Water Content and Counterion Type (Na vs Ca). J Phys Chem B 2023; 127:1828-1841. [PMID: 36791328 PMCID: PMC10159261 DOI: 10.1021/acs.jpcb.2c07129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 01/31/2023] [Indexed: 02/17/2023]
Abstract
Biofilms are the predominant mode of microbial life on Earth, and so a deep understanding of microbial communities─and their impacts on environmental processes─requires a firm understanding of biofilm properties. Because of the importance of biofilms to their microbial inhabitants, microbes have evolved different ways of engineering and reconfiguring the matrix of extracellular polymeric substances (EPS) that constitute the main non-living component of biofilms. This ability makes it difficult to distinguish between the biotic and abiotic origins of biofilm properties. An important route toward establishing this distinction has been the study of simplified models of the EPS matrix. This study builds on such efforts by using atomistic simulations to predict the nanoscale (≤10 nm scale) structure of a model EPS matrix and the sensitivity of this structure to interpolymer interactions and water content. To accomplish this, we use replica exchange molecular dynamics (REMD) simulations to generate all-atom configurations of ten 3.4 kDa alginate polymers at a range of water contents and Ca-Na ratios. Simulated systems are solvated with explicitly modeled water molecules, which allows us to capture the discrete structure of the hydrating water and to examine the thermodynamic stability of water in the gels as they are progressively dehydrated. Our primary findings are that (i) the structure of the hydrogels is highly sensitive to the identity of the charge-compensating cations, (ii) the thermodynamics of water within the gels (specific enthalpy and free energy) are, surprisingly, only weakly sensitive to cation identity, and (iii) predictions of the differential enthalpy and free energy of hydration include a short-ranged enthalpic term that promotes hydration and a longer-ranged (presumably entropic) term that promotes dehydration, where short and long ranges refer to distances shorter or longer than ∼0.6 nm between alginate strands.
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Affiliation(s)
- Avery A. Agles
- Department
of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Ian C. Bourg
- Department
of Civil and Environmental Engineering and High Meadows Environmental
Institute, Princeton University, Princeton, New Jersey 08544, United States
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6
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Sakamoto H, Hafuka A, Tsuchiya T, Kimura K. Intensive routine cleaning for mitigation of fouling in flat-sheet ceramic membranes used for drinking water production: Unique characteristics of resulting foulants. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Cai YH, Gopalakrishnan A, Deshmukh KP, Schäfer AI. Renewable energy powered membrane technology: Implications of adhesive interaction between membrane and organic matter on spontaneous osmotic backwash cleaning. WATER RESEARCH 2022; 221:118752. [PMID: 35810632 DOI: 10.1016/j.watres.2022.118752] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 05/23/2022] [Accepted: 06/13/2022] [Indexed: 05/26/2023]
Abstract
Organic matter (OM) in surface and ground waters may cause membrane fouling that is laborious to clean once established. Spontaneous osmotic backwash (OB) induced by solar irradiance fluctuation has been demonstrated for early mineral scaling/organic fouling control in decentralised small-scale photovoltaic powered-nanofiltration/reverse osmosis (PV-NF/RO) membrane systems. However, various OM types will interact differently with membranes which in turn affects the effectiveness of OB. This work evaluates the suitability of spontaneous OB cleaning for eleven OM types (covering low-molecular-weight organics (LMWO), humic substances, polyphenolic compounds and biopolymers) regarding adhesive interactions with NF/RO membranes. The adhesive interactions were quantified by an asymmetric flow field-flow fractionation coupled with an organic carbon detector (FFFF-OCD). The underlying mechanism of OM-membrane adhesive interactions affecting OB cleaning was elucidated. The results indicate that humic acid (a typical humic substance) and tannic acid (a typical polyphenolic compound) induced stronger adhesive interaction with NF/RO membranes than biopolymers and LMWO. When the mass loss of an OM due to adhesion was below a critical range, the spontaneous OB is most effective (>85% flux recovery); and above this range, the OB becomes ineffective (<50% flux recovery). Polyphenolic compounds and humic substances resulted in lower OB cleaning efficiency, due to their higher aromatic content, enhancing hydrophobic interactions and hydrogen bonding. Calcium-facilitated adhesion of some OM types (such as humic substances, polyphenolics and biopolymers) increased irreversible organic fouling potential and weakened OB cleaning, which was verified by both FFFF-OCD and membrane filtration results. This work provides a guidance to formulate strategies to enhance spontaneous OB cleaning, such as first identifying the adhesion of OM in feedwater (surface and ground waters) using FFFF-OCD, and then removing "sticky" OM using suitable pre-treatment processes.
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Affiliation(s)
- Yang-Hui Cai
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Akhil Gopalakrishnan
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Kaumudi Pradeep Deshmukh
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Andrea I Schäfer
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
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8
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Wang Q, Liu F, Xu Q. Insight into the effect of calcium on bio-clogging behavior via quartz crystal microbalance with dissipation monitoring. CHEMOSPHERE 2022; 292:133547. [PMID: 34998841 DOI: 10.1016/j.chemosphere.2022.133547] [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: 10/09/2021] [Revised: 12/26/2021] [Accepted: 01/04/2022] [Indexed: 06/14/2023]
Abstract
Bio-clogging of leachate collection systems has attracted much attention because of its threat to landfill slope stability and landfill landslide events. Calcium in leachate plays a vital role in the formation of bio-clogging. However, the influence of calcium on bio-clogging remains unclear. This study examined the effects of calcium concentration on bio-clogging, including 0, 1.25, 5, 25, and 75 mM CaCl2 groups. A technique involving quartz crystal microbalance with dissipation monitoring (QCM-D) was applied to evaluate the bacteria adhesion behaviors in real time. The results showed that the presence of Ca2+ accelerated the bacterial attachment and increased the viscoelasticity of deposited layers. The deposition mass for 75 mM CaCl2 was 1442 ± 260 ng/cm2, which is 1.5 times that for 1.25 mM CaCl2. The Derjaguin-Landau-Verwey-Overbeek (DLVO) theory could explain the bacterial adhesion behaviors in low calcium concentrations (<25 mM). In comparison, the effect of calcium bridge was shown in high calcium concentrations (>25 mM). The development of biofilms was a dynamic process, and the Ca2+ concentration was positively related to the amount of biofilm generated. In low CaCl2 concentration (less than 5 mM) groups, the degree of bio-clogging increased from the exponential growth phase to the decline phase; in contrast, in high CaCl2 concentration (above 25 mM) groups, the degree of bio-clogging increased and later declined. Therefore, the calcium concentration should be controlled at a low level in leachate to mitigate bio-clogging in LCSs.
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Affiliation(s)
- Qian Wang
- School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China
| | - Feng Liu
- School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China
| | - Qiyong Xu
- School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China.
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9
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Meng S, Wang R, Meng X, Wang Y, Fan W, Liang D, Zhang M, Liao Y, Tang C. Reaction heterogeneity in the bridging effect of divalent cations on polysaccharide fouling. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2021.119933] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Wang H, Ke L, Ding Y, Rao P, Xu T, Han H, Zhou J, Ding W, Shang X. Effect of calcium ions on rheological properties and structure of Lycium barbarum L. polysaccharide and its gelation mechanism. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2021.107079] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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11
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Yin Z, Shao Q, Wen T, Li A, Long C. Insights into the coupling pre-ozonation with coagulation pre-treatment for mitigating biopolymer fouling of reverse osmosis membrane: Role of Ca2+. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119768] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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12
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Lin B, Heijman SG, Shang R, Rietveld LC. Integration of oxalic acid chelation and Fenton process for synergistic relaxation-oxidation of persistent gel-like fouling of ceramic nanofiltration membranes. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119553] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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13
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Cirillo AI, Tomaiuolo G, Guido S. Membrane Fouling Phenomena in Microfluidic Systems: From Technical Challenges to Scientific Opportunities. MICROMACHINES 2021; 12:820. [PMID: 34357230 PMCID: PMC8305447 DOI: 10.3390/mi12070820] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/08/2021] [Accepted: 07/09/2021] [Indexed: 12/13/2022]
Abstract
The almost ubiquitous, though undesired, deposition and accumulation of suspended/dissolved matter on solid surfaces, known as fouling, represents a crucial issue strongly affecting the efficiency and sustainability of micro-scale reactors. Fouling becomes even more detrimental for all the applications that require the use of membrane separation units. As a matter of fact, membrane technology is a key route towards process intensification, having the potential to replace conventional separation procedures, with significant energy savings and reduced environmental impact, in a broad range of applications, from water purification to food and pharmaceutical industries. Despite all the research efforts so far, fouling still represents an unsolved problem. The complex interplay of physical and chemical mechanisms governing its evolution is indeed yet to be fully unraveled and the role played by foulants' properties or operating conditions is an area of active research where microfluidics can play a fundamental role. The aim of this review is to explore fouling through microfluidic systems, assessing the fundamental interactions involved and how microfluidics enables the comprehension of the mechanisms characterizing the process. The main mathematical models describing the fouling stages will also be reviewed and their limitations discussed. Finally, the principal dynamic investigation techniques in which microfluidics represents a key tool will be discussed, analyzing their employment to study fouling.
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Affiliation(s)
- Andrea Iginio Cirillo
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, University of Naples Federico, 80125 Naples, Italy; (A.I.C.); (S.G.)
- CEINGE Advanced Biotechnologies, 80131 Naples, Italy
| | - Giovanna Tomaiuolo
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, University of Naples Federico, 80125 Naples, Italy; (A.I.C.); (S.G.)
- CEINGE Advanced Biotechnologies, 80131 Naples, Italy
| | - Stefano Guido
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, University of Naples Federico, 80125 Naples, Italy; (A.I.C.); (S.G.)
- CEINGE Advanced Biotechnologies, 80131 Naples, Italy
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14
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Organic fouling control in reverse osmosis (RO) by effective membrane cleaning using saturated CO2 solution. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118410] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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15
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Christensen M, Jørgensen M, Van De Staey G, De Cock L, Smets I. Hydraulic resistance and osmotic pressure effects in fouling layers during MBR operations. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119213] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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16
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Xie Q, Zheng X, Li L, Ma L, Zhao Q, Chang S, You L. Effect of Curcumin Addition on the Properties of Biodegradable Pectin/Chitosan Films. Molecules 2021; 26:2152. [PMID: 33918007 PMCID: PMC8068353 DOI: 10.3390/molecules26082152] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/02/2021] [Accepted: 04/06/2021] [Indexed: 11/25/2022] Open
Abstract
A pectin/chitosan matrix-loaded curcumin film (PCCF) with a deep eutectic solvent (DES) as the solvent and plasticizer was prepared in this study. Different quantities of curcumin (identified as PCCF-0, PCCF-1, PCCF-2. PCCF-3) were loaded on the pectin/chitosan film in order to evaluate their effects on the film properties. Results showed that curcumin could interact with the pectin/chitosan matrix and form a complex three-dimensional network structure. PCCF could promote the thickness, tensile strength, thermal properties, antioxidant and antiseptic capacities, but deteriorate the light transmission and elongation at the same time. The addition of curcumin would change the color of the film, without significantly affecting the moisture content. The tensile strength of PCCF-3 reached the maximum value of 3.75 MPa, while the elongation decreased to 10%. Meanwhile, the water-resistance properties of PCCF-3 were significantly promoted by 8.6% compared with that of PCCF-0. Furthermore, PCCF showed remarkable sustained antioxidant activities in a dose-dependent manner. PCCF-3 could inhibit DPPH and ABTS free radicals by 58.66% and 29.07%, respectively. It also showed antiseptic capacity on fresh pork during storage. Therefore, curcumin addition could improve the barrier, mechanical, antioxidant and antiseptic properties of the polysaccharide-based film and PCCF has the potential to be used as a new kind of food packaging material in the food industry.
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Affiliation(s)
- Qingtong Xie
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; (Q.X.); (X.Z.); (L.L.); (L.M.); (Q.Z.)
| | - Xudong Zheng
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; (Q.X.); (X.Z.); (L.L.); (L.M.); (Q.Z.)
| | - Liuting Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; (Q.X.); (X.Z.); (L.L.); (L.M.); (Q.Z.)
| | - Liqun Ma
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; (Q.X.); (X.Z.); (L.L.); (L.M.); (Q.Z.)
| | - Qihui Zhao
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; (Q.X.); (X.Z.); (L.L.); (L.M.); (Q.Z.)
| | - Shiyuan Chang
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; (Q.X.); (X.Z.); (L.L.); (L.M.); (Q.Z.)
- Overseas Expertise Introduction Center for Food Nutrition and Human Health (111 Center), South China University of Technology, Guangzhou 510640, China
| | - Lijun You
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; (Q.X.); (X.Z.); (L.L.); (L.M.); (Q.Z.)
- Overseas Expertise Introduction Center for Food Nutrition and Human Health (111 Center), South China University of Technology, Guangzhou 510640, China
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17
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Wang Q, Zhang T, Wu G, Xu Q. Deciphering acyl-homoserine lactones-mediated quorum sensing on geotextile bio-clogging in municipal solid waste and bottom ash co-disposal landfills. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 124:136-143. [PMID: 33621757 DOI: 10.1016/j.wasman.2021.02.001] [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: 08/19/2020] [Revised: 01/19/2021] [Accepted: 02/01/2021] [Indexed: 06/12/2023]
Abstract
Bottom ash co-disposed in landfills accelerates geotextile clogging and decreases landfill stability. As the main contributor to clogging, bio-clogging may be associated with quorum sensing (QS) in microbial communities. This study investigated the potential roles of acyl-homoserine lactones (AHLs)-mediated QS in geotextile bio-clogging under different landfill conditions, including municipal solid waste landfill and bottom ash co-disposal landfill. The unit area of geotextile bio-clogging mass in the municipal solid waste landfill (MSW_G) ranged from 5.2 × 10-3 to 8.2 × 10-3 g/cm2, while it was in the range of 8.4 × 10-3 to 1.2 × 10-2 g/cm2 in the bottom ash co-disposal landfill (BA_G). Two types of AHLs were detected and the total AHLs content in the MSW_G (1,616.9 ± 103.8 ng/g VSS) was half of that in the BA_G (3,233.0 ± 646.8 ng/g VSS). High contents of the AHLs could increase bio-clogging. The bio-clogging was also attributed to QS genes and extracellular polymeric substances (EPS). EPS aggregation was stimulated due to the higher Ca2+ and Mg2+ in the BA_G. These results suggested that the co-disposal of bottom ash could increase the AHLs content, resulting in accelerated bio-clogging.
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Affiliation(s)
- Qian Wang
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Tianqi Zhang
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Guangxue Wu
- Civil Engineering, School of Engineering, College of Science and Engineering, National University of Ireland, Galway, Galway, Ireland
| | - Qiyong Xu
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China.
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18
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Wang Q, Ko JH, Xu Q. Comparison of bio-clogging characteristics of geotextiles in MSW and bottom ash co-disposal landfills. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 120:459-466. [PMID: 33127278 DOI: 10.1016/j.wasman.2020.10.003] [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: 03/17/2020] [Revised: 06/29/2020] [Accepted: 10/02/2020] [Indexed: 06/11/2023]
Abstract
Bio-clogging of geotextile is a big challenge for the leachate collection system in landfills. It is important to understand the characteristics of geotextile bio-clogging to develop control technologies. This study investigated the characteristics of geotextile bio-clogging in municipal solid waste landfill (MSW_G) and bottom ash (BA) co-disposal landfill (BA_G). Results showed that the bio-clogging mass of per area in MSW_G and BA_G was 49 ± 5 g/m2 and 57 ± 3 g/m2, respectively. Bio-clogging was dominated by live cells in both MSW_G and BA_G. The confocal laser scanning microscopy images revealed that live cells percentage was 46% in MSW_G, while it increased to 77% in BA_G. In contrast, the percentage of the dead cells was 47% and 9% in MSW_G and BA_G, respectively. The biofilm formed in BA _G was thinner and denser than that in MSW_G. Based on the microbial analysis, the biofilms of BA_G had a higher genetic amount and diversity than these of MSW_G. The total amount of extracellular polymeric substances in BA_G was 45.29 ± 4.52 mg/g volatile suspended solids, which was 1.5 times of that in MSW_G. The co-disposal of BA increased the microbial diversity and accelerated bio-clogging due to the high calcium concentration. These findings provide a better understanding of the bio-clogging characteristics, which is helpful to control bio-clogging in co-disposal landfills.
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Affiliation(s)
- Qian Wang
- School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, PR China
| | - Jae Hac Ko
- Department of Environmental Engineering, College of Ocean Sciences, Jeju National University, Jeju Special Self-Governing Province 63243, Republic of Korea
| | - Qiyong Xu
- School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, PR China.
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19
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Cao D, Jin J, Wang Q, Song X, Hao X, Iritani E, Katagiri N. Ultrafiltration recovery of alginate: Membrane fouling mitigation by multivalent metal ions and properties of recycled materials. Chin J Chem Eng 2020. [DOI: 10.1016/j.cjche.2020.05.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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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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21
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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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22
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Xu H, Xiao K, Wang X, Liang S, Wei C, Wen X, Huang X. Outlining the Roles of Membrane-Foulant and Foulant-Foulant Interactions in Organic Fouling During Microfiltration and Ultrafiltration: A Mini-Review. Front Chem 2020; 8:417. [PMID: 32582627 PMCID: PMC7283953 DOI: 10.3389/fchem.2020.00417] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 04/21/2020] [Indexed: 12/15/2022] Open
Abstract
Membrane fouling remains a notorious problem in microfiltration (MF) and ultrafiltration (UF), and a systematic understanding of the fouling mechanisms is fundamental for solving this problem. Given a wide assortment of fouling studies in the literature, it is essential that the numerous pieces of information on this topic could be clearly compiled. In this review, we outline the roles of membrane-foulant and foulant-foulant intermolecular interactions in MF/UF organic fouling. The membrane-foulant interactions govern the initial pore blocking and adsorption stage, whereas the foulant-foulant interactions prevail in the subsequent build-up of a surface foulant layer (e.g., a gel layer). We classify the interactions into non-covalent interactions (e.g., hydrophobic and electrostatic interactions), covalent interactions (e.g., metal-organic complexation), and spatial effects (related to pore structure, surface morphology, and foulants size for instance). They have either short- or long-range influences on the transportation and immobilization of the foulant toward the membrane. Specifically, we profile the individual impacts and interplay between the different interactions along the fouling stages. Finally, anti-fouling strategies are discussed for a targeted control of the membrane-foulant and foulant-foulant interactions.
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Affiliation(s)
- Hao Xu
- School of Civil Engineering, Guangzhou University, Guangzhou, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
| | - Kang Xiao
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
- Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China
| | - Xiaomao Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China
| | - Shuai Liang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, China
| | - Chunhai Wei
- School of Civil Engineering, Guangzhou University, Guangzhou, China
| | - Xianghua Wen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China
| | - Xia Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China
- Research and Application Center for Membrane Technology, School of Environment, Tsinghua University, Beijing, China
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23
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Chen Y, Xu L, Wang Y, Chen Z, Zhang M, Chen H. Characterization and functional properties of a pectin/tara gum based edible film with ellagitannins from the unripe fruits of Rubus chingii Hu. Food Chem 2020; 325:126964. [PMID: 32387994 DOI: 10.1016/j.foodchem.2020.126964] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Revised: 04/24/2020] [Accepted: 04/30/2020] [Indexed: 11/16/2022]
Abstract
Edible films are popular for the development of food packaging. The suitable additive is the key point for the improvement of edible film performance. In this study, edible films (LTEFs) based on blends of ellagitannins (ET) from the unripe fruits of Rubus chingii Hu, low methoxyl pectin (LMP) and tara gum (TG) were characterized and evaluated. The results showed that the thickness and water resistance were increased with the addition of TG and ET. The content of TG and ET obviously influenced its mechanical properties. FT-IR and SEM results suggested that there were interactions between ET and the film substrates, which modified its structure and connection mode. Moreover, the LTEF showed effective antioxidant activity and antimicrobial activity. These results suggested that TG and ETs had the potential to improve the performance of the pectin film and the LTEF could be used as a functional edible film for application in food industries.
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Affiliation(s)
- Yue Chen
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, PR China.
| | - Leilei Xu
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, PR China.
| | - Yajie Wang
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, PR China.
| | - Zhongqin Chen
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, PR China.
| | - Min Zhang
- Tianjin Agricultural University, Tianjin 300384, PR China; State Key Laboratory of Nutrition and Safety, Tianjin University of Science & Technology, Tianjin 300457, PR China.
| | - Haixia Chen
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, PR China.
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24
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Lee H, Ahmad R, Kim J. Alginate to simulate biofouling in submerged fluidized ceramic membrane reactor: Effect of solution pH and ionic strength. BIORESOURCE TECHNOLOGY 2020; 302:122813. [PMID: 31991391 DOI: 10.1016/j.biortech.2020.122813] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 01/10/2020] [Accepted: 01/13/2020] [Indexed: 06/10/2023]
Abstract
Membrane fouling was investigated experimentally by fluidizing non-adsorbed plastic scouring media on flat-tubular ceramic membrane treating a sodium alginate solution as a representative of polysaccharides in wastewater. Fouling rate increased with set-point permeate flux, but it was remarkably reduced by fluidizing the scouring agent regardless of the flux applied. Higher solution pH resulted in more reduction in membrane fouling due to electrostatic repulsion enhanced between alginate foulant and membrane surface which are both negatively charged. The addition of divalent cations such as Ca2+ and Cu2+ mitigated alginate fouling significantly due to the back transport associated with formation of larger particles away from membrane. However, the addition of monovalent cations accelerated the membrane fouling with less effectiveness of the media fluidization in fluidized bed membrane reactor. Adding monovalent ions was thought to transform rigid, compact and spherocolloidal macromolecular structure of alginate into the intramolecular charge shielding to neutralize functional groups.
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Affiliation(s)
- Hyemin Lee
- Department of Environmental Engineering, Inha University, Inharo-100, Michuhologu, Incheon, Republic of Korea
| | - Rizwan Ahmad
- Department of Environmental Engineering, Inha University, Inharo-100, Michuhologu, Incheon, Republic of Korea; Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Pakistan
| | - Jeonghwan Kim
- Department of Environmental Engineering, Inha University, Inharo-100, Michuhologu, Incheon, Republic of Korea.
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25
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Xu B, Albert Ng TC, Huang S, Shi X, Ng HY. Feasibility of isolated novel facultative quorum quenching consortiums for fouling control in an AnMBR. WATER RESEARCH 2020; 114:151-180. [PMID: 31706123 DOI: 10.1016/j.watres.2017.02.006] [Citation(s) in RCA: 485] [Impact Index Per Article: 121.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 01/10/2017] [Accepted: 02/02/2017] [Indexed: 05/06/2023]
Abstract
Anaerobic membrane bioreactor (AnMBR) technology is being recognized as an appealing strategy for wastewater treatment, however, severity of membrane fouling inhibits its widespread implementations. This study engineered novel facultative quorum quenching consortiums (FQQs) coping with membrane fouling in AnMBRs with preliminary analysis for their quorum quenching (QQ) performances. Herein, Acyl-homoserine lactones (AHLs)-based quorum sensing (QS) in a lab-scale AnMBR initially revealed that N-Hexanoyl-dl-homoserine lactone (C6-HSL), N-Octanoyl-dl-homoserine lactone (C8-HSL) and N-Decanoyl-dl-homoserine lactone (C10-HSL) were the dominant AHLs in AnMBRs in this study. Three FQQs, namely, FQQ-C6, FQQ-C8 and FQQ-C10, were harvested after anaerobic screening of aerobic QQ consortiums (AeQQs) which were isolated by enrichment culture, aiming to degrade C6-HSL, C8-HSL and C10-HSL, respectively. Growth of FQQ-C6 and FQQ-C10 using AHLs as carbon source under anaerobic condition was significantly faster than those using acetate, congruously suggesting that their QQ performance will not be compromised in AnMBRs. All FQQs degraded a wide range of AHLs pinpointing their extensive QQ ability. FQQ-C6, FQQ-C8 and FQQ-C10 remarkably alleviated extracellular polymeric substances (EPS) production in a lab-scale AnMBR by 72.46%, 35.89% and 65.88%, respectively, and FQQ-C6 retarded membrane fouling of the AnMBR by 2 times. Bioinformatics analysis indicated that there was a major shift in dominant species from AeQQs to FQQs where Comamonas sp., Klebsiella sp., Stenotrophomonas sp. and Ochrobactrum sp. survived after anaerobic screening and were the majority in FQQs. High growth rate utilizing AHLs under anaerobic condition and enormous EPS retardation efficiency in FQQ-C6 and FQQ-C10 could be attributed to Comamonas sp.. These findings demonstrated that FQQs could be leveraged for QQ under anaerobic systems. We believe that this was the first work proposing a bacterial pool of facultative QQ candidates holding biotechnological promises for membrane fouling control in AnMBRs.
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Affiliation(s)
- Boyan Xu
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576
| | - Tze Chiang Albert Ng
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576
| | - Shujuan Huang
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576
| | - Xueqing Shi
- School of Environmental and Municipal Engineering, Qingdao University of Technology, 11 Fushun Road, Qingdao, 266033, PR China
| | - How Yong Ng
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576; National University of Singapore Environmental Research Institute, 5A Engineering Drive 1, 117411, Singapore.
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26
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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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27
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Wang W, Shen M, Jiang L, Song Q, Liu S, Xie M, Xie J. Rheological behavior, microstructure characterization and formation mechanism of Mesona blumes polysaccharide gels induced by calcium ions. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2019.03.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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A functional polysaccharide film forming by pectin, chitosan, and tea polyphenols. Carbohydr Polym 2019; 215:1-7. [DOI: 10.1016/j.carbpol.2019.03.029] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Revised: 03/04/2019] [Accepted: 03/10/2019] [Indexed: 01/02/2023]
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29
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Influences of multi influent matrices on the retention of PPCPs by nanofiltration membranes. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.11.040] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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30
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Abass OK, Fang F, Zhuo M, Zhang K. Integrated interrogation of causes of membrane fouling in a pilot-scale anoxic-oxic membrane bioreactor treating oil refinery wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 642:77-89. [PMID: 29894884 DOI: 10.1016/j.scitotenv.2018.06.049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 06/03/2018] [Accepted: 06/04/2018] [Indexed: 06/08/2023]
Abstract
Studies on membrane fouling during treatment of oil refinery wastewater (ORW) via membrane bioreactor (MBR) are currently lacking, and associated fouling challenges are largely undocumented. Using advanced chemical and Illumina sequencing approach, we investigated the complex bio-physiochemical interactions responsible for foulant-membrane interactions during treatment of ORW. After nearly 2 months of the MBR operation, COD removal reached maximal of 97.15 ± 1.85%, while oil and grease removal was maintained at 96.6 ± 2.6%, during the treatment duration. Most of the less or non-biodegradable oil moieties (>0.5 μm) progressively accumulated on the membrane as the influent oil concentration increased. Presence of relatively higher unsaturated extracellular polymers (100.6 mg/g VSS) like fulvic acid and aromatic-like compounds at high volumetric loading (~18.7 kg COD/m3/d), enhanced the adsorption of chemical elements (Fe = 88.9, Al = 63.4, and Ce = 0.56 mg/g dry-sludge, respectively). Moreover, shift in microbial community structure to hydrocarbon-utilizing and metals-tolerating genera, as Comamonas and Rhodanobacter, respectively, uncovers major membrane colonizers in ORW treatment via MBR.
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Affiliation(s)
- Olusegun K Abass
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Fang Fang
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Maoshui Zhuo
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Kaisong Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
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31
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Abstract
Complex carbohydrates are ubiquitous in nature, and together with proteins and nucleic acids they comprise the building blocks of life. But unlike proteins and nucleic acids, carbohydrates form nonlinear polymers, and they are not characterized by robust secondary or tertiary structures but rather by distributions of well-defined conformational states. Their molecular flexibility means that oligosaccharides are often refractory to crystallization, and nuclear magnetic resonance (NMR) spectroscopy augmented by molecular dynamics (MD) simulation is the leading method for their characterization in solution. The biological importance of carbohydrate-protein interactions, in organismal development as well as in disease, places urgency on the creation of innovative experimental and theoretical methods that can predict the specificity of such interactions and quantify their strengths. Additionally, the emerging realization that protein glycosylation impacts protein function and immunogenicity places the ability to define the mechanisms by which glycosylation impacts these features at the forefront of carbohydrate modeling. This review will discuss the relevant theoretical approaches to studying the three-dimensional structures of this fascinating class of molecules and interactions, with reference to the relevant experimental data and techniques that are key for validation of the theoretical predictions.
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Affiliation(s)
- Robert J Woods
- Complex Carbohydrate Research Center and Department of Biochemistry and Molecular Biology , University of Georgia , 315 Riverbend Road , Athens , Georgia 30602 , United States
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32
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Maddela NR, Zhou Z, Yu Z, Zhao S, Meng F. Functional Determinants of Extracellular Polymeric Substances in Membrane Biofouling: Experimental Evidence from Pure-Cultured Sludge Bacteria. Appl Environ Microbiol 2018; 84:e00756-18. [PMID: 29858205 PMCID: PMC6052268 DOI: 10.1128/aem.00756-18] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Accepted: 05/20/2018] [Indexed: 01/26/2023] Open
Abstract
The aim of this work was to better understand the roles of extracellular polymeric substances (EPS) in membrane biofouling at the single-strain level. In the present study, a total of 23 bacterial strains were isolated from a sludge sample. The EPS extracted from pure-cultured bacteria were assessed for their fouling potentials and were simultaneously analyzed using Fourier transform infrared spectroscopy (FTIR). Further, the impact of calcium on the chemical composition of EPS and membrane fouling behavior was investigated in a strain-dependent manner. The EPS of the 23 bacterial strains exhibited different IR features for protein and polysaccharide regions. In addition, an α-1,4-glycosidic linkage (920 cm-1) and amide II (1,550 cm-1) correlated very well with the fouling potentials of all pure-cultured bacteria. In contrast to low-fouling strains, medium- and high-fouling strains exhibited two distinct peaks at 1,020 cm-1 (uronic acids) and 1,250 cm-1 (O-acetyl), which accelerate membrane fouling given their gelling capacities. In the presence of calcium, the fouling potential of a high-fouling strain (Bacillus sp. strain JSB10) was profoundly reduced (P < 0.0005) due to the binding activity of an α-1,4-glycosidic linkage and amide II with calcium. However, the impact of calcium on a low-fouling strain (Vagococcus sp. strain JSB21) was insignificant. Two-dimensional FTIR correlation spectroscopic (2D-FTIR-COS) analysis further revealed that the susceptibilities of functional groups to calcium largely relied on the composition and abundance of the above-described functional groups in EPS. These findings suggest that bacterial strains with different fouling potentials exhibit varied responses to calcium.IMPORTANCE Membrane biofouling is one of the main challenges for the operation of membrane-based processes used for water and wastewater treatment. This study revealed the functional determinants of EPS in membrane biofouling of 23 bacterial strains isolated from a full-scale membrane bioreactor (MBR) plant. We found that an α-1,4-glycosidic bond, amide II, and uronic acids of EPS significantly correlated with the fouling potentials of bacteria. The roles of these EPS groups in membrane fouling were impacted by calcium resulting from EPS-calcium interactions. In addition, our results also demonstrated that any perturbations in the sludge bacterial community in MBRs can lead to varied filtration potentials of the bulk liquor.
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Affiliation(s)
- Naga Raju Maddela
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, People's Republic of China
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, People's Republic of China
| | - Zhongbo Zhou
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, People's Republic of China
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, People's Republic of China
| | - Zhong Yu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, People's Republic of China
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, People's Republic of China
| | - Shanshan Zhao
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, People's Republic of China
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, People's Republic of China
| | - Fangang Meng
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, People's Republic of China
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, People's Republic of China
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Huang H, Lin Y, Peng P, Geng J, Xu K, Zhang Y, Ding L, Ren H. Calcium ion- and rhamnolipid-mediated deposition of soluble matters on biocarriers. WATER RESEARCH 2018; 133:37-46. [PMID: 29407713 DOI: 10.1016/j.watres.2018.01.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 12/28/2017] [Accepted: 01/04/2018] [Indexed: 06/07/2023]
Abstract
Start-up of biofilm process initiated by the deposition of soluble matters on biocarriers is a very important yet time-consuming procedure. However, rapid start-up methods especially in the enhancement of soluble matters deposition have been rarely addressed. In this study, a quartz crystal microbalance with dissipation monitoring (QCM-D) was applied to investigate the influences of calcium ion and rhamnolipid (RL) on the deposition of soluble matters from real and synthetic industrial wastewaters with different configurations of organics (bovine serum albumin and sodium alginate) and ionic strength on the model biocarriers polystyrene and polyamide. Results showed that deposition was effectively promoted by the addition of Ca2+ and along with the increase in Ca2+ content. However, RL enhanced the deposition effectively only in hyperhaline wastewater through breaking hydration repulsion and decreased the deposition in low-salinity wastewater, and its influence to the deposited layer property exhibited characteristics of negative feedback. The combined use of Ca2+ and RL had a better enhancement effect than that of separate use and the mechanism involved can not be soundly explained only by Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The strategy of mediating the deposition of soluble matters on different biocarriers by adding Ca2+ and RL has important implications for regulating biofilm formation to accelerate the start-up process in attached-growth bioreactors.
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Affiliation(s)
- Hui Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Yuan Lin
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Pengcheng Peng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Jinju Geng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Ke Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Yan Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Lili Ding
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
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Su Y, Huang C, Lu F, Tong X, Niu J, Mao L. Alginate affects agglomeration state and uptake of 14C-labeled few-layer graphene by freshwater snails: Implications for the environmental fate of graphene in aquatic systems. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 234:513-522. [PMID: 29216489 DOI: 10.1016/j.envpol.2017.11.087] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 11/24/2017] [Accepted: 11/27/2017] [Indexed: 06/07/2023]
Abstract
Understanding of the interaction of graphene with natural polysaccharides (e.g., alginate) is crucial to elucidate its environmental fate. We investigated the impact of alginate on the agglomeration and stability of 14C-labeled few-layer graphene (FLG) in varying concentrations of monovalent (NaCl) and divalent (CaCl2) electrolytes. Enhanced agglomeration occurred at high CaCl2 concentrations (≥5 mM) due to the alginate gel networks formation in the presence of Ca2+. FLG enmeshed within extended alginate gel networks was observed under transmission electron microscope and atomic force microscope. However, background Na+ competition for binding sites with Ca2+ at the alginate surfaces shielded the gelation of alginate. FLG was readily dispersed by alginate under environmentally relevant ionic strength conditions (i.e., <200 mM Na+ and <5 mM Ca2+). In comparison with the bare FLG, the slow sedimentation of the alginate-stabilized FLG (158 μg/L) caused continuous exposure of this nanomaterial to freshwater snails, which ingested 1.9 times more FLG through filter-feeding within 72 h. Moreover, surface modification of FLG by alginate significantly increased the whole-body and intestinal levels of FLG, but reduced the internalization of FLG to the intestinal epithelial cells. These findings indicate that alginate will act as a stabilizing agent controlling the transport of FLG in aqueous systems. This study also provides the first evidence that interaction of graphene with natural polysaccharides affected the uptake of FLG in the snails, which may alter the fate of FLG in aquatic environments.
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Affiliation(s)
- Yu Su
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China
| | - Chi Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China
| | - Fenxiao Lu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China
| | - Xin Tong
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China
| | - Junfeng Niu
- Beijing Normal University, School of Environment, State Key Lab Water Environmental Simulation, Beijing 100875, China
| | - Liang Mao
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
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Su T, Qi X, Zuo G, Pan X, Zhang J, Han Z, Dong W. Polysaccharide metallohydrogel obtained from Salecan and trivalent chromium: Synthesis and characterization. Carbohydr Polym 2018; 181:285-291. [DOI: 10.1016/j.carbpol.2017.10.088] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 10/17/2017] [Accepted: 10/25/2017] [Indexed: 11/24/2022]
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Charfi A, Jang H, Kim J. Membrane fouling by sodium alginate in high salinity conditions to simulate biofouling during seawater desalination. BIORESOURCE TECHNOLOGY 2017; 240:106-114. [PMID: 28286013 DOI: 10.1016/j.biortech.2017.02.086] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 02/16/2017] [Accepted: 02/18/2017] [Indexed: 06/06/2023]
Abstract
This study aims to better understand biofouling by algal organic matters (AOM) during seawater pretreatment by microfiltration (MF). To simulate AOM biofouling, sodium alginate (SA) solutions with three different concentrations (2, 20 and 50ppm) were filtered in dead-end mode with MF membrane. A modelling approach with blocking laws was used to identify the fouling mechanisms behind flux decline with time. The effect of SA concentration and cations such as Na+ (0.6M) and Ca2+ (0.015M) addition to SA solution on fouling mechanisms was studied. While for low SA concentration (2ppm), fouling occurs within two phases: a pore constriction phase followed by cake formation phase, for high SA concentration (50ppm), fouling occurs within only one phase controlled by cake formation. The addition of Na+ (0.6M) or Ca2+ (0.015M) to SA solution mitigates membrane fouling, however, the addition of both cations enhances fouling by formation of dense cake layer on membrane.
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Affiliation(s)
- Amine Charfi
- Department of Environmental Engineering, Inha University, Namgu Yonghyun dong 253, Incheon, Republic of Korea
| | - Hoseok Jang
- Department of Environmental Engineering, Inha University, Namgu Yonghyun dong 253, Incheon, Republic of Korea
| | - Jeonghwan Kim
- Department of Environmental Engineering, Inha University, Namgu Yonghyun dong 253, Incheon, Republic of Korea.
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Shoaib T, Carmichael A, Corman RE, Shen Y, Nguyen TH, Ewoldt RH, Espinosa-Marzal RM. Self-adaptive hydrogels to mineralization. SOFT MATTER 2017; 13:5469-5480. [PMID: 28812774 DOI: 10.1039/c7sm01058c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Mineralized biological tissues, whose behavior can range from rigid to compliant, are an essential component of vertebrates and invertebrates. Little is known about how the behavior of mineralized yet compliant tissues can be tuned by the degree of mineralization. In this work, a synthesis route to tune the structure and mechanical response of agarose gels via ionic crosslinking and mineralization has been developed. A combination of experimental techniques demonstrates that crosslinking via cooperative hydrogen bonding in agarose gels is disturbed by calcium ions, but they promote ionic crosslinking that modifies the agarose network. Further, it is shown that the rearrangement of the hydrogel network helps to accommodate precipitated minerals into the network -in other words, the hydrogel self-adapts to the precipitated mineral- while maintaining the viscoelastic behavior of the hydrogel, despite the reinforcement caused by mineralization. This work not only provides a synthesis route to design biologically inspired soft composites, but also helps to understand the change of properties that biomineralization can cause to biological tissues, organisms and biofilms.
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Affiliation(s)
- Tooba Shoaib
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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Membrane recovery of alginate in an aqueous solution by the addition of calcium ions: Analyses of resistance reduction and fouling mechanism. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.04.050] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Azaïs A, Mendret J, Petit E, Brosillon S. Evidence of solute-solute interactions and cake enhanced concentration polarization during removal of pharmaceuticals from urban wastewater by nanofiltration. WATER RESEARCH 2016; 104:156-167. [PMID: 27522026 DOI: 10.1016/j.watres.2016.08.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 07/07/2016] [Accepted: 08/04/2016] [Indexed: 06/06/2023]
Abstract
The objective of this paper is to help understanding the distinctive influence of the matrix and of the flux decline (e.g. through the cake enhanced concentration polarization (CECP) phenomenon) on the removal mechanisms of four pharmaceutically active compounds (PhACs) from wastewater treatment plant (WWTP) effluent by nanofiltration (NF). PhACs which are commonly encountered in secondary treated effluent were spiked in various matrix (real and synthetic) to investigate the separate and synergetic effects of the organic and ionic environment on PhACs rejection by two commercial membranes (NF-90 and NF-270). With pure water, rejection of NF membranes is dependent on the type of PhACs and of the permeate flux variations. Then, it appeared that the rejection of PhACs by NF-90 was poorly influenced by the type of compounds, because of the prevalence of steric mechanisms, but rather influenced by permeate flux variations and thus to fouling. For this tight NF membrane, CECP impacts PhACs rejection at the start of filtration while after a dense cake is formed, it became enhanced. On the contrary, rejections of PhACs by the NF-270 were enhanced during the filtration of the real wastewater in comparison with spiked pure water. It appeared that for loose-NF membranes, PhACs rejection is mainly governed by solute-solute interactions (EfOM-compound association) or electrostatic membrane-solute interactions. Finally, it seems that calcium concentration of the effluent is a critical parameter for the rejection of PhACs as it alters both the availability of sites for PhACs association and the fouling layer density. Rejections of the NF-270 were negatively impacted in the presence of Ca2+. Such a study has practical implications for further understanding of the fate of trace organic compounds during nanofiltration of wastewater for reuse applications.
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Affiliation(s)
- Antonin Azaïs
- IEM, Institut Européen des Membranes, Université Montpellier 2, Place Eugène Bataillon, 34095, Montpellier, France
| | - Julie Mendret
- IEM, Institut Européen des Membranes, Université Montpellier 2, Place Eugène Bataillon, 34095, Montpellier, France.
| | - Eddy Petit
- IEM, Institut Européen des Membranes, Université Montpellier 2, Place Eugène Bataillon, 34095, Montpellier, France
| | - Stephan Brosillon
- IEM, Institut Européen des Membranes, Université Montpellier 2, Place Eugène Bataillon, 34095, Montpellier, France
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Chen J, Zhang M, Li F, Qian L, Lin H, Yang L, Wu X, Zhou X, He Y, Liao BQ. Membrane fouling in a membrane bioreactor: High filtration resistance of gel layer and its underlying mechanism. WATER RESEARCH 2016; 102:82-89. [PMID: 27328364 DOI: 10.1016/j.watres.2016.06.028] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 05/22/2016] [Accepted: 06/12/2016] [Indexed: 05/27/2023]
Abstract
A membrane bioreactor (MBR) was continuously operated to investigate mechanisms of fouling caused by the gel layer in this study. Agar was used as a model foulant for gel layer formation, and filtration resistance of gel layers was systematically assessed. The results showed that gel layer possessed unusually high specific filtration resistance (SFR) and high measured porosity as compared with cake layer. Current knowledge cannot explain the contradiction between high filtration resistance and high porosity of gel layer. A new fouling mechanism based on Flory-Huggins theory was then proposed. Filtration resistance of agar gel layer was found to be independent of pH and ionic strength, but linearly increase with gel thickness. The results are accordant with the mechanism deductions. Simulation of the mechanism model showed that the filtration resistance induced by mixing chemical potential variation was comparable to the experimental data of filtration resistance of agar gel layer, indicating that the proposed mechanism is the predominant mechanism responsible for the high filtration resistance of gel layer. The proposed mechanism was further verified from the bound water viewpoint.
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Affiliation(s)
- Jianrong Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Meijia Zhang
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Fengquan Li
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Lei Qian
- 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.
| | - Lining Yang
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Xilin Wu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Xiaoling Zhou
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Yiming He
- Department of Materials Physics, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Bao-Qiang Liao
- Department of Chemical Engineering, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, P7B 5E1, Canada
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Fathy M, Abdel Moghny T, Mousa MA, El-Bellihi AHAA, Awadallah AE. Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models. APPLIED NANOSCIENCE 2016. [DOI: 10.1007/s13204-016-0537-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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He X, Meng F, Lin A, Li J, Tang CY. Characteristics and fouling propensity of polysaccharides in the presence of different monovalent ions. AIChE J 2016. [DOI: 10.1002/aic.15276] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xiang He
- School of Environmental Science and Engineering; Sun Yat-sen University; Guangzhou 510275 P.R. China
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology; Sun Yat-sen University; Guangzhou 510275 P.R. China
| | - Fangang Meng
- School of Environmental Science and Engineering; Sun Yat-sen University; Guangzhou 510275 P.R. China
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology; Sun Yat-sen University; Guangzhou 510275 P.R. China
| | - Anli Lin
- School of Environmental Science and Engineering; Sun Yat-sen University; Guangzhou 510275 P.R. China
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology; Sun Yat-sen University; Guangzhou 510275 P.R. China
| | - Jiapeng Li
- College of Urban and Environmental Sciences; Hubei Normal University; Huangshi 435002 P.R. China
| | - Chuyang Y. Tang
- Dept. of Civil Engineering; The University of Hong Kong; Pokfulam Hong Kong P.R. China
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Chen XD, Yang HW, Liu WJ, Wang XM, Xie YF. Filterability and structure of the fouling layers of biopolymer coexisting with ferric iron in ultrafiltration membrane. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2015.08.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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