The effect of PBS on methane production in combined MEC-AD system fed with alkaline pretreated sewage sludge

Xi-Jun Xu, Wan-Qiong Wang, Chuan Chen, Peng Xie, Wen-Zong Liu, Xu Zhou, Xue-Ting Wang, Ye Yuan, Ai-Jie Wang, Duu-Jong Lee, Yi-Xing Yuan and Nan-Qi Ren

Renewable Energy, 2020, vol. 152, issue C, 229-236

Abstract: Batch experiments were conducted to study bioelectrochemical enhancement of the anaerobic digestion (AD) of alkaline-pretreated sewage sludge in microbial electrolysis cell (MEC) in the presence or absence of phosphate buffer solution (PBS). Experimental results showed that the maximum methane production rate was increased from 0.18 mL-CH4/(mLreactor·d) (control) to 0.2 mL-CH4/(mLreactor·d) in the presence of PBS and cumulative methane production was 1.4-fold higher than that of control. The initial concentrations of SCOD, protein, polysaccharide and VFAs in the presence of PBS were slightly higher than those of control, suggesting that PBS might facilitate the release of organics into mixed liquor. The microbial community analysis results showed that the microbial community with PBS had higher diversity and Bacteroidetes and Firmicutes were the two most abundant phyla in the communities. Moreover, the PBS addition could enhance the growth of aceticlastic methanogens (Methanosaeta) and inhibit a portion of hydrogenotrophic methanogens (Methanobacterium), possibly due to the different cell wall composition.

Keywords: Anaerobic digestion; Microbial electrolysis cell; Alkaline pretreated sludge; Phosphate buffer solution; Methane production (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:152:y:2020:i:c:p:229-236

DOI: 10.1016/j.renene.2020.01.052

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