Guo Xiaobo, Sun Chihe, Lin Richen, Xia Ao, Huang Yun, Zhu Xianqing, Show Pau-Loke, Murphy Jerry D
Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, College of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
MaREI Centre, Environmental Research Institute, University College Cork, Cork, Ireland; School of Engineering, University College Cork, Cork, Ireland.
J Hazard Mater. 2020 Nov 15;399:122830. doi: 10.1016/j.jhazmat.2020.122830. Epub 2020 May 17.
Stimulating direct interspecies electron transfer with conductive materials is a promising strategy to overcome the limitation of electron transfer efficiency in syntrophic methanogenesis of industrial wastewater. This paper assessed the impact of conductive foam nickel (FN) supplementation on syntrophic methanogenesis and found that addition of 2.45 g/L FN in anaerobic digestion increased the maximum methane production rate by 27.4 % (on day 3) while decreasing the peak production time by 33 % as compared to the control with no FN. Cumulative methane production from day 2 to 6 was 14.5 % higher with addition of 2.45 g/L FN than in the control. Levels of FN in excess of 2.45 g/L did not show benefits. Cyclic voltammetry results indicated that the biofilm formed on the FN could generate electrons. The dominant bacterial genera in suspended sludge were Dechlorobacter and Rikenellaceae DMER64, whereas that in the FN biofilm was Clostridium sensu stricto 11. The dominant archaea Methanosaeta in the FN biofilm was enriched by 14.1 % as compared to the control.
利用导电材料刺激种间直接电子转移是克服工业废水共营养产甲烷过程中电子转移效率限制的一种有前景的策略。本文评估了添加导电泡沫镍（FN）对共营养产甲烷的影响，发现与不添加FN的对照相比，在厌氧消化中添加2.45 g/L的FN可使最大甲烷产生速率提高27.4%（在第3天），同时使峰值产生时间缩短33%。添加2.45 g/L FN时，第2天至第6天的累积甲烷产量比对照高14.5%。超过2.45 g/L的FN水平未显示出益处。循环伏安法结果表明，在FN上形成的生物膜可以产生电子。悬浮污泥中的优势细菌属为脱氯杆菌属和理研菌科DMER64，而FN生物膜中的优势细菌属为严格梭菌属11。与对照相比，FN生物膜中的优势古菌甲烷八叠球菌属富集了14.1%。
