Journal
ENVIRONMENTAL RESEARCH
Volume 188, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.109867
Keywords
Electrostatic field; Bioelectrochemical anaerobic digestion; Conductive material; DIET pathway; Methane production
Funding
- National Natural Science Foundation of China [21908118]
- Shandong Provincial Natural Science Foundation [ZR2019MB070]
- Foundation of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences) [ZZ20190116]
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The influence of electrostatic field on the direct interspecies electron transfer (DIET) pathways for methane production was investigated in a batch bioelectrochemical anaerobic digester (BEAD). The ultimate methane production and methane yield in the BEAD reactor saturated to 925 +/- 29 mL/L and 309.9 +/- 9.6 mL CH4/g COD, respectively, which were much higher than 616 +/- 3 mL/L and 205.4 +/- 205.4 mL CH4/g COD in the anaerobic digester (AD). In the cyclic voltammogram (CV) for bulk solution, the oxidation peak current was 0.52 mA in the BEAD reactor, which was higher than 0.24 mA of AD reactor. This shows that the oxidizing ability of microorganisms was greatly improved in the BEAD reactor. Anaemlineaceae, a well-known electroactive bacterial family, was well enriched in the BEAD reactor. It indicates that the electrostatic field can enrich the electroactive bacteria and activate the DIET pathways for methane production. Moreover, the conductive material (activated carbon) further improved the performance of BEAD reactor, implies that the conductivities of bulk solution is one of the important parameters for the DIET pathways.
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