COD/sulfate ratio does not affect the methane yield and microbial diversity in anaerobic digesters

WATER RESEARCH

卷:155

Article

Cetecioglu, Zeynep^1,2  Dolfing, Jan³  Taylor, Jessica²  Purdy, Kevin J.²  Eyice, Ozge⁴ 

[1] KTH Royal Inst Technol, Sch Chem Sci & Engn, SE-10044 Stockholm, Sweden

[2] Univ Warwick, Sch Life Sci, Coventry CV4 7AL, W Midlands, England

[3] Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

[4] Queen Mary Univ London, Sch Biol & Chem Sci, London E1 4NS, England

关键词: Anaerobic digestion;    Methanogens;    Sulfate reducers;    COD/Sulfate ratio;   

DOI  :  10.1016/j.watres.2019.02.038

来源: Elsevier

【 摘 要 】

Anaerobic digestion of organic matter is the major route of biomethane production. However, in the presence of sulfate, sulfate-reducing bacteria (SRB) typically outcompete methanogens, which may reduce or even preclude methane production from sulfate-containing wastewaters. Although sulfate reduction and methanogenesis can occur simultaneously, our limited understanding of the microbiology of anaerobic digesters treating sulfate-containing wastewaters constrains improvements in the production of methane from these systems. This study tested the effects of carbon sources and chemical oxygen demand-to-sulfate ratio (COD/SO42-) on the diversity and interactions of SRB and methanogens in an anaerobic digester treating a high-sulfate waste stream. Overall, the data showed that sulfate removal and methane generation occurred in varying efficiencies and the carbon source had limited effect on the methane yield. Importantly, the results demonstrated that methanogenic and SRB diversities were only affected by the carbon source and not by the COD/SO42- ratio. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

Free