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Wang J, Liu Q, Ma S, Hu H, Wu B, Zhang XX, Ren H. Distribution characteristics of N-acyl homoserine lactones during the moving bed biofilm reactor biofilm development process: Effect of carbon/nitrogen ratio and exogenous quorum sensing signals. BIORESOURCE TECHNOLOGY 2019; 289:121591. [PMID: 31230907 DOI: 10.1016/j.biortech.2019.121591] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 05/27/2019] [Accepted: 05/30/2019] [Indexed: 06/09/2023]
Abstract
Carbon/nitrogen (C/N) ratios play an important role in biological wastewater treatment processes, with quorum sensing (QS) coordinating biological group behaviors. However, the relationship between them remains unclear. This study investigated the effects of varying C/N ratios and exogenous QS signals on the distribution characteristics of AHLs in Moving Bed Biofilm Reactors during the biofilm development process. Results show that C10-HSL and C12-HSL were the dominant AHLs, with the highest concentrations observed in the reactor with a C/N ratio of 10, followed by C/N ratios of 20 and 4. With varying C/N ratios, the biofilm microbial community structure changed significantly, which may contribute to significant differences in the distribution of AHLs. Furthermore, with the addition of a QS strain Sphingomonas rubra sp. nov., the pollutant removal efficiency of the reactor was not significantly improved and a reversible change in community composition was temporarily observed.
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Affiliation(s)
- Jinfeng Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Qiuju Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Sijia Ma
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Haidong Hu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Bing Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Xu-Xiang Zhang
- 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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Tian X, Ahmed W, Delatolla R. Nitrifying bio-cord reactor: performance optimization and effects of substratum and air scouring. ENVIRONMENTAL TECHNOLOGY 2019; 40:480-488. [PMID: 29098963 DOI: 10.1080/09593330.2017.1397760] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 10/13/2017] [Indexed: 06/07/2023]
Abstract
Ammonia removal kinetics and solids' production performance of the bio-cord technology are studied in this research. Three nitrifying reactors housing different bio-cord substratum were operated at five different ammonia loading rates. All of the bio-cord substrata demonstrated stable and high ammonia-nitrogen removal efficiencies of 96.8 ± 0.9%, 97.0 ± 0.6% and 92.0 ± 0.4% at loading rates of 0.8, 1.6 and 1.8 g -N/m2 d, respectively. At these same loading rates, the bio-cord reactors housing the three substrata also showed low solids' production rates of 0.19 ± 0.03, 0.23 ± 0.02, 0.25 ± 0.03 g total suspended solids/d. A reduction of system stability, identified via fluctuating ammonia removal rates, was however observed for all substrata at loading rates of 2.1 and 2.4 g -N/m2 d. Further, the solids' production rates at these higher loading conditions were also observed to fluctuate for all substrata, likely indicating intermediate sloughing events. The effects of enhancing the air scouring of the bio-cord on the ammonia removal rate was shown to be dependent upon the substratum, while enhanced air scouring of the bio-cord was shown to stabilize the production of solids for all substrata. This study represents the first performance and optimization study of the bio-cord technology for low-carbon nitrification and shows that air scouring of the substratum reduces sloughing events at elevated loading and that the bio-cord technology achieves stable kinetics above conventional rates of 1 g -N/m2 d to values of 1.8 g -N/m2 d.
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Affiliation(s)
- Xin Tian
- a Department of Civil Engineering , University of Ottawa , Ottawa , ON , Canada
| | - Warsama Ahmed
- a Department of Civil Engineering , University of Ottawa , Ottawa , ON , Canada
| | - Robert Delatolla
- a Department of Civil Engineering , University of Ottawa , Ottawa , ON , Canada
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Zhu Y. Preparation and characterization of a new hydrophilic and biocompatible magnetic polypropylene carrier used in wastewater treatment. ENVIRONMENTAL TECHNOLOGY 2018; 39:2736-2746. [PMID: 28791890 DOI: 10.1080/09593330.2017.1365940] [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: 03/20/2017] [Accepted: 08/05/2017] [Indexed: 06/07/2023]
Abstract
This paper employed a blending method to prepare a new hydrophilic and biocompatible magnetic polypropylene carrier (HBMPC) and pure polypropylene carrier (PPC). Mechanical strength, magnetic induction on surface, microstructure, hydrophilicity and biocompatibility of HBMPC were measured, characterized and investigated respectively. The results showed that mechanical strength of PPC and HBMPC was not much different; magnetic induction on the surface of HBMPC was 4-6 mT; HBMPC had relatively large surface roughness and specific surface; average water content of PPC and HBMPC was 47.1% and 64.7%, respectively; contact angle of PPC and HBMPC was 88.7° and 58.5°, respectively; adsorption capacity of HBMPC and PPC to microorganism was 5.40E + 05 and 5.70E + 04 cfu (g·h)-1, respectively. It took about 15 days for PPC to succeed in biofilm culturing while it took only 12 days for HBMPC. COD and [Formula: see text] removal efficiencies of PPC and HBMPC on the 15th day of biofilm formation were 80.5%, 90.5%, 63.7% and 85.4%, respectively; and growth status of microorganism adhering to the surface of HBMPC was better than that of PPC, biomass on single HBMPC and PPC after succeeded in biofilm culturing was 43.9 and 27.4 mg, respectively. All of these indicated that HBMPC had excellent hydrophilicity and biocompatibility.
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Affiliation(s)
- Youli Zhu
- a Faculty of Urban Construction and Environmental Engineering , Chongqing University , Chongqing , 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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Lv ZH, Wang J, Yang GF, Feng LJ, Mu J, Zhu L, Xu XY. Underestimated effects of sediments on enhanced startup performance of biofilm systems for polluted source water pretreatment. Biodegradation 2017; 29:89-103. [DOI: 10.1007/s10532-017-9815-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 12/07/2017] [Indexed: 10/18/2022]
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Enhancing nitrogen removal efficiency of domestic wastewater through increased total efficiency in sewage treatment (ITEST) pilot plant in cold climatic regions of Baltic Sea. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.ijsbe.2017.05.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Feng LJ, Jia R, Sun JY, Wang J, Lv ZH, Mu J, Yang GF. Response of performance and bacterial community to oligotrophic stress in biofilm systems for raw water pretreatment. Biodegradation 2017; 28:231-244. [DOI: 10.1007/s10532-017-9792-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 04/25/2017] [Indexed: 10/19/2022]
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8
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Performance improvement of raw water pretreatment process with pre-inoculation biofilm: feasibility and limiting factors. Biodegradation 2016; 28:111-123. [DOI: 10.1007/s10532-016-9781-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 11/28/2016] [Indexed: 10/20/2022]
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Yang GF, Feng LJ, Wang SF, Zhou JH, Guo CR, Xia T, Sun WX, Jiang YJ, Sun XY, Cao L, Xu XY, Zhu L. Potential risk and control strategy of biofilm pretreatment process treating raw water. BIORESOURCE TECHNOLOGY 2015; 198:456-463. [PMID: 26413896 DOI: 10.1016/j.biortech.2015.09.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Revised: 09/10/2015] [Accepted: 09/11/2015] [Indexed: 06/05/2023]
Abstract
An enhanced lab-scale biofilm pretreatment process treating raw water obtained from eutrophicated water bodies was established and started up with a novel strategy of low-level nutrients addition and effluent recirculation. Results showed that the startup strategy was useful for biofilm formation and pollutants removal, but it had the risks of increasing substrate affinity constant (Ks) and biofilm decay in treating raw water. Fortunately, the increased Ks value did not affected the NH4(+)-N removal performance via keeping the NH4(+)-N loading rate larger than 6.29 mg L(-1)d(-1). In addition, lower hydraulic retention time (HRT) favored the removal of organic matters, and the maximum TOC removal rate of 76.5 mg L(-1)d(-1) were achieved at HRT of 2h. After long-term acclimatization at oligotrophic niche, the decrease of Ks value and increase of biomass, extracellular polymeric substances, bioactivity were achieved. Finally, the stable operation of biofilm pretreatment process was realized in treating polluted raw water.
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Affiliation(s)
- Guang-Feng Yang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Li-Juan Feng
- Department of Environmental Engineering, Zhejiang Ocean University, No. 1 Haida South Road, Zhoushan 316022, China
| | - Sha-Fei Wang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Jia-Heng Zhou
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Cai-Rong Guo
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Tian Xia
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Wen-Xiong Sun
- Haining Second Waterworks Co. Ltd., Haining 314408, China
| | - Yue-Jie Jiang
- Haining Second Waterworks Co. Ltd., Haining 314408, China
| | - Xiao-Yan Sun
- Haining Second Waterworks Co. Ltd., Haining 314408, China
| | - Lian Cao
- Haining Second Waterworks Co. Ltd., Haining 314408, China
| | - Xiang-Yang Xu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China
| | - Liang Zhu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China.
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Yang GF, Feng LJ, Wang SF, Yang Q, Xu XY, Zhu L. Performance and enhanced mechanism of a novel bio-diatomite biofilm pretreatment process treating polluted raw water. BIORESOURCE TECHNOLOGY 2015; 191:271-280. [PMID: 26000837 DOI: 10.1016/j.biortech.2015.05.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 05/08/2015] [Accepted: 05/11/2015] [Indexed: 06/04/2023]
Abstract
A lab-scale novel bio-diatomite biofilm process (BDBP) was established for the polluted raw water pretreatment in this study. Results showed that a shorter startup period of BDBP system was achieved under the completely circulated operation mode, and the removal efficiencies of nitrogen and disinfection by-product precursor were effective at low hydraulic retention time of 2-4 h due to high biomass attached to the carrier and diatomite. A maximum NH4(+)-N oxidation potential predicted by modified Stover-Kincannon model was 333.3 mg L(-1) d(-1) in the BDBP system, which was 4.7 times of that in the control reactor. Results demonstrated that the present of bio-diatomite favors the accumulation of functional microbes in the oligotrophic niche, and the pollutants removal performance of this novel process was enhanced for polluted raw water pretreatment.
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Affiliation(s)
- Guang-feng Yang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Li-juan Feng
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Department of Environmental Engineering, Zhejiang Ocean University, No. 1 Haida South Road, Zhoushan 316022, China
| | - Sha-fei Wang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Qi Yang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Xiang-yang Xu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China
| | - Liang Zhu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China.
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Feng L, Yang G, Zhu L, Xu X, Gao F, Mu J, Xu Y. Enhancement removal of endocrine-disrupting pesticides and nitrogen removal in a biofilm reactor coupling of biodegradable Phragmites communis and elastic filler for polluted source water treatment. BIORESOURCE TECHNOLOGY 2015; 187:331-337. [PMID: 25863211 DOI: 10.1016/j.biortech.2015.03.095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 03/20/2015] [Accepted: 03/21/2015] [Indexed: 06/04/2023]
Abstract
The coupling of conventional elastic filler and solid carbon source of Phragmites communis (P. communis) as the biofilm support was applied in a biofilm system for treating polluted source water containing nitrogen and trace endocrine-disrupting pesticides (cypermethrin and chlorpyrifos). Results showed that removal efficiencies of TN and EDPs were improved with addition of 3.6kg P. communis/m(3) in the biofilm system. Meanwhile, the uniform distribution of P. communis favored simultaneously nitrogen and organics removal but not to trace EDPs compared with non-uniform distribution of P. communis. The biofilm on elastic filler was mainly responsible for the nitrification with NH4(+)-N oxidation efficiency of 82.9±1.5%. Poor nitrification with NH4(+)-N oxidation efficiency of 36.3±6.1% but effective denitrification with a TN removal efficiency of 56.5±2.0% were obtained by the biofilm on P. communis. Cypermethrin was mainly removed via adsorption and microbial degradation, and chlorpyrifos removal mostly depended on the microbial degradation in biofilm system.
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Affiliation(s)
- Lijuan Feng
- Department of Environmental Engineering, Zhejiang Ocean University, No. 1 Haida South Road, Zhoushan 316022, PR China; Department of Environmental Engineering, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China
| | - Guangfeng Yang
- Department of Environmental Engineering, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China
| | - Liang Zhu
- Department of Environmental Engineering, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China.
| | - Xiangyang Xu
- Department of Environmental Engineering, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China
| | - Feng Gao
- Department of Environmental Engineering, Zhejiang Ocean University, No. 1 Haida South Road, Zhoushan 316022, PR China
| | - Jun Mu
- Department of Environmental Engineering, Zhejiang Ocean University, No. 1 Haida South Road, Zhoushan 316022, PR China
| | - Yanmei Xu
- Department of Environmental Engineering, Zhejiang Ocean University, No. 1 Haida South Road, Zhoushan 316022, PR China
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