Microbial electrolysis cells (MEC) accelerated methane production from the enhanced hydrolysis and acidogenesis of raw waste activated sludge
Microbial electrolysis cells (MEC) accelerated methane production from the enhanced hydrolysis and acidogenesis of raw waste activated sludge
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微生物电解池（MEC）通过增强原废活性污泥的水解和酸作用来加速甲烷的产生
DOI：
10.1016/j.cej.2020.127472
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发表时间：
2020-10
影响因子：
15.1
通讯作者：
Duu-Jong Lee
中科院分区：
文献类型：
--
作者：
Xue-Ting Wang;Lei Zhao;Chuan Chen;Ke-Yang Chen;Han Yang;Xi-Jun Xu;Xu Zhou;Wen-Zong Liu;De-Feng Xia;Nan-Qi Ren;Duu-Jong Lee
厌氧消化与微生物电解池耦合（MEC-AD）通常被认为可以加速生物质水解产物的甲烷生产。研究了MEC-AD系统分别投加未经处理的活性污泥（rWAS）和经热处理的活性污泥（hWAS）的产甲烷性能及功能菌的响应。结果表明，施加0.8V电压后，rWAS和hWAS的甲烷产率均得到显著提高，分别是未施加电压时（第一次开路，阶段I）的7.8倍和2.1倍。令人惊讶的是，当施加的电压随后降低到0 V时，hWAS的增强观察几乎消失，但rWAS的甲烷生产率仍然高达6.3 mL gVSS in-1d-1，仍然是第一次开路时的6.2倍。与hWAS产甲烷能力的增强不同，rWAS中的外加电压不仅有利于产电菌和产甲烷菌的富集，而且特别有利于发酵菌和互养产乙酸菌在两种电极生物膜中的富集。除产电菌外，rWAS中这种有利的微生物结构并没有随着电压的去除而消失。因此，产乙酸菌和产氢产甲烷菌的协同作用以及水解发酵能力的增强可能是MEC-AD中以rWAS为底物保持高效产甲烷的主要原因。本研究的结果在经济和环境方面具有吸引力，这可能会支持传统AD中的高和稳定的甲烷生产，通过富集功能微生物以更少的能源投入。
The anaerobic digestion coupled with the microbial electrolysis cell (MEC-AD) is generally thought to accelerate methane production from the hydrolysate of biomass. This work studied the methanogenesis performance and response of functional microorganisms in MEC-AD feeding with raw waste activated sludge (rWAS) and heat pretreated waste activated sludge (hWAS), respectively. The results showed that the methane productivity of rWAS and hWAS were both substantially enhanced by applied voltage at 0.8 V, being 7.8 times and 2.1 times higher than that without voltage supply (the first open circuit, stage I). Surprisingly, when applied voltage was afterward decreased back to 0 V, the enhanced observation of hWAS almost gone, but the methane productivity of rWAS remained as high as 6.3 mL gVSSin−1d−1, which were still 6.2 times higher than that in the first open circuit. Different from the enhancement of methanogenesis on hWAS, the applied voltage in rWAS not only benefited to enrich the electricigens and methanogens, but also specially to enrich the fermentative bacteria and syntrophic acetogenic bacteria in both electrode biofilms. While this advantageous microbial structure in rWAS did not disappear with the removal of voltage supply except electricigens. Therefore, the enhanced hydrolysis-fermentation and synergy of acetogenic bacteria and hydrogenotrophic methanogens might be the main reason for keeping the high efficiency of methanogenesis with rWAS as substrate in MEC-AD. The findings reported in this study is economically and environmentally attractive, which might support high and stable methane production in traditional AD by enriching functional microorganisms with less energy input in the future.
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影响因子：
4.4
作者：
Pisciotta, John M.;Zaybak, Zehra;Logan, Bruce E.
通讯作者：
Logan, Bruce E.
影响因子：
12.8
作者：
Zhigang Yang;Lijie Zhang;Changliang Nie;Qingjie Hou;Shasha Zhang;Haiyan Pei
通讯作者：
Zhigang Yang;Lijie Zhang;Changliang Nie;Qingjie Hou;Shasha Zhang;Haiyan Pei
影响因子：
3.2
作者：
Abken, HJ;Tietze, M;Deppenmeier, U
通讯作者：
Deppenmeier, U
影响因子：
4.4
作者：
Holmes, Dawn E.;Shrestha, Pravin M.;Lovley, Derek R.
通讯作者：
Lovley, Derek R.
影响因子：
7.8
作者：
Bougrier, C.;Delgenes, J. -P.;Carrere, H.
通讯作者：
Carrere, H.