Hydrogen sulfide affects the performance of a methanogenic bioelectrochemical system used for biogas upgrading

WATER RESEARCH

卷:200

Article

Dykstra, Christy M.^1,2  Pavlostathis, Spyros G.¹ 

[1] Georgia Inst Technol, Sch Civil & Environm Engn, 311 Ferst Dr, Atlanta, GA 30332 USA

[2] San Diego State Univ, Dept Civil Construct & Environm Engn, 5500 Campanile Dr, San Diego, CA 92182 USA

关键词: Bioanode;    Biocathode;    Carbon dioxide;    Methane;    Methanobrevibacter;    Sulfur oxidation;   

DOI  :  10.1016/j.watres.2021.117268

来源: Elsevier

【 摘 要 】

Methanogenic bioelectrochemical systems (BESs) can convert carbon dioxide (CO2) to methane (CH4) and may be used for anaerobic digester biogas upgrading. However, the effect of hydrogen sulfide (H2S), a common biogas component, on BES performance is unknown. Thus, the objective of this study was to assess the effect of H2S addition to the cathode headspace on BES performance at a range of initial gasphase H2S concentrations (0-6% v/v), as well as its effect on the anode and cathode microbial communities. As the initial cathode headspace H2S increased from 0 to 2% (v/v), biocathodic CH4 production increased by two-fold to 3.56 +/- 0.36 mmol/L-d, due to dissolved H2S transport from the cathode to the anode where H2S was oxidized. Elemental sulfur and sulfate were H2S oxidation products detected in the anode. Above 3% initial cathode headspace H2S, biocathodic CH4 production declined due to inhibition. A phylotype most closely related to Methanobrevibacter arboriphilus dominated the cathode archaeal communities. In the sulfide-amended BES, a phylotype similar to the exoelectrogen Ochrobactrum anthropi was enriched in both the anode and cathode, whereas phylotypes related to sulfate-reducing and sulfur oxidizing Bacteria were detected in the bioanode. Thus, sulfide transport and oxidation in the anode play an important role in methanogenic BESs treating sulfide-bearing biogas. (C) 2021 The Author(s). Published by Elsevier Ltd.

【 授权许可】

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