Increased biodegradability of low-grade coal wastewater in anaerobic membrane bioreactor by adding yeast wastes

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Demineralization is required in upgrading low-grade coal to serve as an alternative energy resource for the production of fuel and valuable chemicals but generates a large amount of low-grade coal wastewater (LCWW). The objective of this study was to investigate the effects of a co-substrate on an anaerobic membrane bioreactor (AnMBR) treating LCWW. CH4 was not produced during the operation fed by LCWW alone. When yeast wastes (YW) were supplemented, there was a gradual increase in the biodegradability of LCWW, achieving 182 CH4 mL/g COD with 58% COD removal efficiency. The analysis of physicochemical characteristics in the effluent of AnMBR, done by excitation-emission matrix (EEM) and size exclusion chromatography (SEC), showed that the proportion of soluble microbial products (SMPs) and aromatic group with high-molecular weight (>1 kDa) increased. Microbial analysis revealed that the increased dominance of bacteria Comamonas, Methanococcus, and Methanosarcina facilitated biodegradation of LCWW in the presence of YW.
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Issue Date
2019-03
Language
English
Article Type
Article
Citation

JOURNAL OF ENVIRONMENTAL MANAGEMENT, v.234, pp.36 - 43

ISSN
0301-4797
DOI
10.1016/j.jenvman.2018.12.083
URI
http://hdl.handle.net/10203/249786
Appears in Collection
CE-Journal Papers(저널논문)
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