He Xia, Xu Weijia, Lu Jian, Wu Jun, Guo Zhenyu, Wei Xuerui, Wang Chun
College of Environmental Science and Engineering, Guilin University of Technology, Guangxi 541006, China.
CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, China.
Bioresour Technol. 2022 Nov;364:128083. doi: 10.1016/j.biortech.2022.128083. Epub 2022 Oct 7.
To investigate the combination of carbon-based conductive materials and exogenous hydrogen (EH) on methane recovery from fat, oil, and grease (FOG), granular activated carbon (GAC) and carbon cloth (CC) were chosen to collaborate with EH, resulting in increased methane production by 59 % and 84 %, respectively. Further digestion of long chain fatty acids (LCFAs) confirms that enhanced direct interspecies electron transfer (DIET) was achieved in the reactors with GAC/CC + EH than those with GAC/CC only. Other evidences (such as increased microbial population and rapid degradation of volatile fatty acids) were found to support the role of GAC/CC + EH in promotion of DIET. Significant change of microbial community was observed using GAC/CC + EH, which was mainly attributed to the enrichment of electrogenic species (such as Spirochaetaceae, Syntrophomonas palmitatica, and Methanosaeta), leading to some changes in metabolic pathways during acidogenesis and methanogenesis. Together, enhanced DIET was achieved by GAC/CC + EH, thus improving the methane recovery from FOG.
为了研究碳基导电材料与外源氢（EH）对从脂肪、油和油脂（FOG）中回收甲烷的联合作用，选择了颗粒活性炭（GAC）和碳布（CC）与EH协同作用，结果甲烷产量分别提高了59%和84%。对长链脂肪酸（LCFAs）的进一步消化证实，与仅使用GAC/CC的反应器相比，在使用GAC/CC + EH的反应器中实现了增强的种间直接电子转移（DIET）。还发现了其他证据（如微生物数量增加和挥发性脂肪酸快速降解）来支持GAC/CC + EH在促进DIET中的作用。使用GAC/CC + EH观察到微生物群落发生了显著变化，这主要归因于产电物种（如螺旋体科、棕榈酸互营单胞菌和甲烷八叠球菌）的富集，导致产酸和产甲烷过程中代谢途径发生了一些变化。总之，GAC/CC + EH实现了增强的DIET，从而提高了从FOG中回收甲烷的效率。
