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Insights into the minimization of excess sludge production in micro-aerobic reactors coupled with a membrane bioreactor: Characteristics of extracellular polymeric substances

Authors
Cheng, YuTian, KunXie, PengRen, XianghaoLi, YingKou, YingyingChon, KangminHwang, Moon-HyunKo, Myung-Han
Issue Date
Apr-2022
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Micro-aerobic reactor; Membrane bioreactor; Extracellular polymeric substances; Excess sludge minimization; Microbial community
Citation
CHEMOSPHERE, v.292
Indexed
SCIE
SCOPUS
Journal Title
CHEMOSPHERE
Volume
292
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/141852
DOI
10.1016/j.chemosphere.2021.133434
ISSN
0045-6535
1879-1298
Abstract
The production of excess sludge by the activated sludge system of wastewater treatment plants is a problem. In this study, the EPS characteristics on production and degradation were investigated in the real-scale food processing wastewater treatment system (i.e., a micro-aerobic reactor coupled with a membrane bioreactor (MAR-MBR)) with a treatment capacity of 150 t d(-1), which could cater for the low production of excess sludge (i.e., 9 t.a(-1); 76% moisture content). The total organic carbon concentrations in the different EPS fractions were in the following order: soluble EPS (S-EPS) < loosely bound EPS (LB-EPS) < tightly bound EPS (TB-EPS). Although the components (e.g., protein and humic acid-like substances) of each EPS fraction changed significantly throughout the MAR-MBR process owing to the low production of excess sludge, the degrees of change in S-EPS, LB-EPS, and TB-EPS were significantly different from the corresponding change in their relative molecular weights. Furthermore, the microbial community composition was beneficial for the release and degradation of EPS, and the regulation of gene functions via the MAR-MBR enhanced this process.
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