Evaluating influence of filling fraction of carriers packed in anaerobic side-stream reactors on membrane fouling and microbial community of the coupled membrane bioreactors
| Autor: | Jie Jiang, Zhen Zhou, Lingyan Jiang, Yue Zheng, Zhiwei Wang, Kaichong Wang, Yanjun Shao, Yirong Chen, Jing Huang, Jianping Huang, Yu Siqi |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Biofouling Nitrogen Health Toxicology and Mutagenesis 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences Membrane bioreactor 01 natural sciences Waste Disposal Fluid Extracellular polymeric substance Bioreactors Ammonium Compounds Bioreactor Environmental Chemistry Anaerobiosis Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies Fouling Sewage Chemistry Extracellular Polymeric Substance Matrix Microbiota Membrane fouling Membranes Artificial Phosphorus Pollution Anoxic waters Membrane Chemical engineering Nitrification Water Pollutants Chemical |
| Zdroj: | Journal of hazardous materials. 388 |
| ISSN: | 1873-3336 |
| Popis: | An anoxic/oxic membrane bioreactors (AO-MBR) and three identical anaerobic side-stream reactor coupled with anoxic/oxic membrane bioreactors (ASSR-MBR) were constructed and operated in parallel to investigate the appropriate filling fraction of carriers packed in ASSR, influences on pollutants removal, sludge reduction, membrane fouling and microbial community of ASSR-MBR. Inserting ASSR achieved efficient COD removal and nitrification, and packing carriers in ASSR obtained the highest sludge reduction efficiency of 50.5 % at filling fraction of 25 %. Compared to AO-MBR, inserting ASSR without carriers induced the release of viscous components in extracellular polymeric substances (EPS) and the formation of calcium carbonate-related bacteria on membrane surface, and thus deteriorated membrane fouling. Packing carriers with 25 % filling fraction promoted the hydrolysis of soluble microbial products and EPS, whilst reduced the viscoelasticity of sludge flocs. Higher filling fraction of 50 % increased the shear forces to the biofilm and biomarkers related to membrane fouling, and thus showed little improvement to alleviate membrane fouling. MiSeq sequencing revealed that although it enriched in the bulk sludge of conventional ASSR-MBR and the coupled reactor with filling fraction of 50 %, the floc-forming, hydrolytic and fermentative bacteria were more inclined to attach on the membrane surface and alleviate fouling process. |
| Databáze: | OpenAIRE |
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