Suspended membrane bioreactor with extracellular polymeric substances as reserve carbon source for low carbon to nitrogen ratio wastewater: Performance and microbial community composition

2021 ◽  
Author(s):  
Min Li ◽  
Junfeng Su ◽  
Yifei Li ◽  
Amjad Ali ◽  
Shu Yang ◽  
...  
Keyword(s):  
Microbial Community ◽  
Carbon Source ◽  
Community Composition ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Microbial Community Composition ◽  
Low Carbon ◽  
Carbon To Nitrogen Ratio ◽  
Nitrogen Ratio ◽  
Suspended Membrane

scholarly journals Effects of sodium citrate on the structure and microbial community composition of an early-stage multispecies biofilm model

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Yuan Yao ◽  
Yang Pu ◽  
Wing Yui Ngan ◽  
Karin Kan ◽  
Jie Pan ◽  
...  
Keyword(s):  
Microbial Community ◽  
Carbon Source ◽  
Community Composition ◽  
Nutrient Medium ◽  
Sodium Citrate ◽  
Early Stage ◽  
Microbial Community Composition ◽  
Biofilm Model ◽  
Multispecies Biofilm ◽  
Biofilm Development

Abstract In recent years, most biofilm studies have focused on fundamental investigations using multispecies biofilm models developed preferentially in simulated naturally occurring low-nutrient medium than in artificial nutrient-rich medium. Because biofilm development under low-nutrient growth media is slow, natural media are often supplemented with an additional carbon source to increase the rate of biofilm formation. However, there are knowledge gaps in interpreting the effects of such supplementation on the resulting biofilm in terms of structure and microbial community composition. We investigated the effects of supplementation of a simulated freshwater medium with sodium citrate on the resulting structure, bacterial community composition, and microbial network interactions of an early-stage multispecies biofilm model. Qualitative and quantitative analyses of acquired confocal laser scanning microscopy data confirmed that sodium citrate supplementation distinctly increased biofilm biomass. Sequencing data revealed that the microbial community structure of biofilms grown in sodium citrate-supplemented conditions was characterized with increased relative abundance and dominance of Proteobacteria compared with that of biofilms grown in sodium citrate-free conditions. Our findings suggest that the supplementation of a low-nutrient medium with a carbon source in experiments involving multispecies biofilms may lead to structural and compositional biases of the microbial community, causing changes in biofilm phenotype.

scholarly journals Mechanism of Membrane Fouling Control by HMBR: Effect of Microbial Community on EPS

2020 ◽  
Vol 17 (5) ◽  
pp. 1681
Author(s):  
Qiang Liu ◽  
Ying Yao ◽  
Delan Xu
Keyword(s):  
Microbial Community ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Microbial Community Composition ◽  
Domestic Wastewater ◽  
Control Group ◽  
Transmembrane Pressure ◽  
Fouling Control ◽  
Cake Layer

A hybrid membrane bioreactor (HMBR) employing activated sludge and biofilm simultaneously is proved to represent a good performance on membrane fouling control compared to conventional membrane bioreactor (CMBR) by reducing extracellular polymeric substances (EPS), especially bound EPS (B-EPS). In order to better understand the mechanism of membrane fouling control by the HMBR in regard of microbial community composition, a pilot scale HMBR operated to treat domestic wastewater for six months, and a CMBR operated at the same time as control group. Results showed that HMBR can effectively control membrane fouling. When transmembrane pressure reached 0.1 MPa, the membrane module in the HMBR operated for about 26.7% longer than that in the CMBR. In the HMBR, the quantity of EPS was significantly lower than that in the CMBR. In this paper, soluble EPS was also found to have a close relationship with cake layer resistance. The species richness and diversity in the HMBR were higher than those in the CMBR, and a certain difference between the compositions of microbial communities in the two reactors was confirmed. Therefore, the difference in microbial community compositions may be the direct reason why EPS in the HMBR was lower than that in the CMBR.

Fine-scale monitoring of shifts in microbial community composition after high organic loading in a pilot-scale membrane bioreactor

2016 ◽  
Vol 121 (5) ◽  
pp. 550-556 ◽  
Author(s):  
Yuya Sato ◽  
Tomoyuki Hori ◽  
Ronald R. Navarro ◽  
Hiroshi Habe ◽  
Hiroshi Yanagishita ◽  
...  
Keyword(s):  
Microbial Community ◽  
Community Composition ◽  
Membrane Bioreactor ◽  
Microbial Community Composition ◽  
Pilot Scale ◽  
Fine Scale ◽  
Organic Loading

Membrane Bioreactor Performance during Processing of a Low Carbon to Nitrogen Ratio Municipal Wastewater

2018 ◽  
Vol 5 (S1) ◽  
pp. 87-100 ◽  
Author(s):  
Athanasios Bezirgiannidis ◽  
Nikolaos Marinakis ◽  
Spyridon Ntougias ◽  
Paraschos Melidis
Keyword(s):  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Low Carbon ◽  
Carbon To Nitrogen Ratio ◽  
Nitrogen Ratio ◽  
Bioreactor Performance

Liming alters microbial community composition and its co-occurrence patterns in Cd- and Pb-contaminated agricultural soil

2021 ◽  
Vol 166 ◽  
pp. 104064
Author(s):  
Xinqi Wang ◽  
Xia Lu ◽  
Zhuoqing Li ◽  
Qi Cheng ◽  
Yimin Zhou ◽  
...  
Keyword(s):  
Microbial Community ◽  
Community Composition ◽  
Agricultural Soil ◽  
Microbial Community Composition ◽  
Occurrence Patterns
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