Evaluating influence of filling fraction of carriers packed in anaerobic side-stream reactors on membrane fouling and microbial community of the coupled membrane bioreactors

2020 ◽  
Vol 388 ◽  
pp. 122030 ◽  
Author(s):  
Yue Zheng ◽  
Zhen Zhou ◽  
Lingyan Jiang ◽  
Jing Huang ◽  
Jie Jiang ◽  
...  
Keyword(s):  
Microbial Community ◽  
Membrane Fouling ◽  
Membrane Bioreactors ◽  
Filling Fraction ◽  
Side Stream

scholarly journals Quorum quenching, biological characteristics, and microbial community dynamics as key factors for combating fouling of membrane bioreactors

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Syed Salman Ali Shah ◽  
Luigi De Simone ◽  
Giuseppe Bruno ◽  
Hyeona Park ◽  
Kibaek Lee ◽  
...  
Keyword(s):  
Microbial Community ◽  
Membrane Fouling ◽  
Community Dynamics ◽  
Bacterial Species ◽  
Quorum Quenching ◽  
Community Change ◽  
Membrane Bioreactors ◽  
Solid Retention Time ◽  
Fouling Control ◽  
Microbial Community Dynamics

AbstractMembrane fouling is a major challenge in membrane bioreactors (MBRs) for wastewater treatment. This study investigates the effects of disturbance and solid retention time (SRT) on quorum-quenching (QQ) MBRs relative to antifouling efficacy and microbial community change. The fouling rate increases with the applied disturbance at a short SRT, counteracting the antifouling effect of QQ; however, it decreases with QQ at a long SRT. The microbial community appears to be responsible for such MBR behaviors. Several bacterial species belonging to the biofilm-forming group are dominant after disturbance, resulting in substantive membrane fouling. However, the balance between the bacterial species plays a key role in MBR fouling propensity when stabilized. Koflera flava becomes dominant with QQ, leading to reduced membrane fouling. QQ makes the MBR microbial community more diverse, while lowering its richness. QQ with long SRT would be a favorable operational strategy for effective MBR fouling control.

scholarly journals Performance and Microbial Community of Different Biofilm Membrane Bioreactors Treating Antibiotic-Containing Synthetic Mariculture Wastewater

Membranes ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 282
Author(s):  
Huining Zhang ◽  
Xin Yuan ◽  
Hanqing Wang ◽  
Shuoqi Ma ◽  
Bixiao Ji
Keyword(s):  
Microbial Community ◽  
Membrane Fouling ◽  
High Throughput Sequencing ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Membrane Bioreactors ◽  
Resistant Bacteria ◽  
Fouling Mitigation ◽  
Maximum Removal

The performance of pollutant removals, tetracycline (TC) and norfloxacin (NOR) removals, membrane fouling mitigation and the microbial community of three Anoxic/Oxic membrane bioreactors (AO-MBRs), including a moving bed biofilm MBR (MBRa), a fixed biofilm MBR (MBRb) and an AO-MBR (MBRc) for control, were compared in treating antibiotic-containing synthetic mariculture wastewater. The results showed that MBRb had the best effect on antibiotic removal and membrane fouling mitigation compared to the other two bioreactors. The maximum removal rate of TC reached 91.65% and the maximum removal rate of NOR reached 45.46% in MBRb. The addition of antibiotics had little effect on the removal of chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N)—both maintained more than 90% removal rate during the entire operation. High-throughput sequencing demonstrated that TC and NOR resulted in a significant decrease in the microbial diversity and the microbial richness MBRs. Flavobacteriia, Firmicutes and Azoarcus, regarded as drug-resistant bacteria, might play a crucial part in the removal of antibiotics. In addition, the dynamics of microbial community had a great change, which included the accumulation of resistant microorganisms and the gradual reduction or disappearance of other microorganisms under antibiotic pressure. The research provides an insight into the antibiotic-containing mariculture wastewater treatment and has certain reference value.

Effects of bioporous carriers on the performance and microbial community structure in side-stream anaerobic membrane bioreactors

2020 ◽  
Vol 66 (8) ◽  
pp. 475-489 ◽  
Author(s):  
Bin Zhang ◽  
Jiao Yue ◽  
Yu Guo ◽  
Taixin Liu ◽  
Min Zhou ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Oxygen Demand ◽  
Illumina Miseq ◽  
Membrane Bioreactors ◽  
Pollutant Removal ◽  
Sludge Reduction ◽  
Porous Carrier ◽  
Side Stream

The aim of this study was to investigate the effects of a volcanic rock porous carrier (VRPC) on sludge reduction, pollutant removal, and microbial community structure in an anaerobic side-stream reactor (ASSR). Three lab-scale membrane bioreactors (MBRs), including an anoxic–oxic MBR, which served as the control (C-MBR), an ASSR-coupled MBR (A-MBR), and an A-MBR filled with VRPC (FA-MBR) were stably and simultaneously operated for 120 days. The effect of the three reactors on the removal of chemical oxygen demand (COD) was almost negligible (all greater than 95%), but the average removal efficiency of ammonium nitrogen, total nitrogen, and total phosphorus was significantly improved by the insertion of an ASSR, especially when the ASSR was filled with VRPC. Finally, A-MBR and FA-MBR achieved 16.2% and 26.4% sludge reduction rates, with observed sludge yields of 0.124 and 0.109 g mixed liquid suspended solids/g COD, respectively. Illumina MiSeq sequencing revealed that microbial diversity and richness were highest in the VRPC, indicating that a large number of microorganisms formed on the carrier surface in the form of a biofilm. Abundant denitrifying bacteria (Azospira, Comamonadaceae_unclassified, and Flavobacterium) were immobilized on the carrier biofilm, which contributed to increased nitrogen removal. The addition of a VRPC to the ASSR successfully immobilized abundant hydrolytic, fermentative, and slow-growing microorganisms, which all contributed to reductions in sludge yield.

scholarly journals Effects of a low-strength magnetic field on the characteristics of activated sludge for membrane fouling mitigation

RSC Advances ◽  
2019 ◽  
Vol 9 (16) ◽  
pp. 9180-9186 ◽  
Author(s):  
Ren Zhijun ◽  
Wang Pengfei ◽  
Tian Jiayu ◽  
Zhang Zhiliu
Keyword(s):  
Magnetic Field ◽  
Microbial Community ◽  
Activated Sludge ◽  
Membrane Fouling ◽  
Membrane Bioreactors ◽  
Sludge Characteristics ◽  
Fouling Mitigation ◽  
Low Strength

This study aims to investigate the performance of a low-strength magnetic field in membrane bioreactors (MBRs) for membrane fouling mitigation and its effects on sludge characteristics and microbial community.

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