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Contributions of enhanced endogenous microbial metabolism via inoculation with a novel microbial consortium into an anoxic side-stream reactor to in-situ sludge reduction for landfill leachate treatment

Authors
Cheng, YuChon, KangminRen, XianghaoLee, YingKou, YingyingWu, YanShen, MingyuHwang, Moon-HyunChae, Kyu-Jung
Issue Date
1-10월-2021
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Keywords
Beneficial microorganisms; Microbial community; Potential gene functions; Side-stream reactor; Sludge reduction
Citation
JOURNAL OF ENVIRONMENTAL MANAGEMENT, v.295
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume
295
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/136088
DOI
10.1016/j.jenvman.2021.113088
ISSN
0301-4797
Abstract
In-situ sludge reduction plays a significant role in reducing excess sludge production. This study investigated the role of beneficial microorganisms (BM) in the anoxic-oxic-settling-anoxic (A-OSA) process associated with the insitu sludge reduction efficiency under synthetic landfill leachate treatment. The rates of excess sludge reduction with the inoculation of BM increased up to 53.6% (calculated as total suspended solids) and 38.3% (calculated as total volume), respectively. Side-stream reactors, as important components of the A-OSA process, were further studied to explore change of parameters related to in-situ sludge reduction. With the inoculation of BM, the release and conversion of extracellular polymeric substances and the dehydrogenase activity (increasing rate = 60.9%) were increased. Species richness and microbial diversity, as well as the microbial community composition (e.g., hydrolytic and fermentative bacteria), were improved via bioaugmentation. Moreover, potential gene functions of microorganisms were positively regulated and the abundance of gene expressions (e.g., nirK, norB) for in-situ sludge reduction could be improved.
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