Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
Volume 55, Issue 11, Pages 1283-1293Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10934529.2020.1789409
Keywords
Anaerobic treatment; sludge digester; microbial community; dsrB gene; biogas
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Funding
- Asahi Glass Foundation, Japan
- Chulabhorn Research Institute, Bangkok, Thailand [BT 2017-01]
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An understanding of microbial communities present in anaerobic bioreactors can strongly facilitate the development of approaches to control undesirable microorganisms, such as sulfate-reducing bacteria (SRB), in the system. In this study, overall microbial communities present in anaerobic bioreactors from seven industrial wastewater treatment plants (including food, pulp and paper industries) were investigated using 16S rRNA gene amplicon sequencing (MiSeq, Illumina). The dominant methanogens identified in the anaerobic bioreactors treating industrial wastewater wereMethanobacteriumandMethanosaeta;Methanospirillumwas a predominant methanogen in the anaerobic sludge digester. Hydrogenotrophic and acetoclastic methanogens were detected at similar relative abundances in the anaerobic covered lagoons treating starch wastewater, whereas hydrogenotrophic methanogens were the predominant methanogens present in the sludge digester. SRB communities were further investigated using dsrB gene clone libraries. The results indicated the presence of SRB, such as unculturedDesulfobulbussp.,Syntrophobacter fumaroxidans,Syntrophorhabdussp. PtaB.Bin027, andDesulfovibrio fructosivarans JJ.Incomplete-oxidizing SRB were the predominant SRB in all of the anaerobic bioreactors treating wastewater. In contrast, similar relative abundances of complete and incomplete-oxidizing SRB were observed in the sludge digester. The results of this study can further facilitate the development of SRB-controlling strategies to improve the efficiency of wastewater treatment.
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