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

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

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.

Suggested Citation

  • Xu, Xi-Jun & Wang, Wan-Qiong & Chen, Chuan & Xie, Peng & Liu, Wen-Zong & Zhou, Xu & Wang, Xue-Ting & Yuan, Ye & Wang, Ai-Jie & Lee, Duu-Jong & Yuan, Yi-Xing & Ren, Nan-Qi, 2020. "The effect of PBS on methane production in combined MEC-AD system fed with alkaline pretreated sewage sludge," Renewable Energy, Elsevier, vol. 152(C), pages 229-236.
    • Handle: RePEc:eee:renene:v:152:y:2020:i:c:p:229-236
    DOI: 10.1016/j.renene.2020.01.052
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    References listed on IDEAS

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    1. Liu, Wenzong & Cai, Weiwei & Guo, Zechong & Wang, Ling & Yang, Chunxue & Varrone, Cristiano & Wang, Aijie, 2016. "Microbial electrolysis contribution to anaerobic digestion of waste activated sludge, leading to accelerated methane production," Renewable Energy, Elsevier, vol. 91(C), pages 334-339.
    2. Li, Yue & Chen, Yinguang & Wu, Jiang, 2019. "Enhancement of methane production in anaerobic digestion process: A review," Applied Energy, Elsevier, vol. 240(C), pages 120-137.
    3. Xiao, Benyi & Chen, Xia & Han, Yunping & Liu, Junxin & Guo, Xuesong, 2018. "Bioelectrochemical enhancement of the anaerobic digestion of thermal-alkaline pretreated sludge in microbial electrolysis cells," Renewable Energy, Elsevier, vol. 115(C), pages 1177-1183.
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