Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Bioresour Technol. 2020 Apr;302:122796. doi: 10.1016/j.biortech.2020.122796. Epub 2020 Jan 13.
In this study, a FeO supported on conductive carbon cloth (FC) was prepared and supplemented into anaerobic digestion reactors to improve propionate degradation. In the FC-supplemented reactors, the cumulative methane production and propionate degradation increased by 15.4% and 19.67% compared with those of the control, respectively. Less methane production with H/CO as the sole substrate in the culture taken from the FC reactors suggested that interspecies hydrogen transfer in the FC reactors was weaker. These results suggested that direct interspecies electron transfer (DIET) was established in the FC reactors to improve the performance. FeO increased the secretion of electron shuttle components of extracellular polymeric substances to increase electron exchange capacity of biomass of the FC reactors, which further facilitated the DIET. Analysis on microbial communities confirmed that the abundance of microorganisms-related DIET in the FC reactors was higher than that in the control.
在这项研究中，制备了负载在导电碳纤维布（FC）上的 FeO，并将其补充到厌氧消化反应器中，以提高丙酸的降解。与对照组相比，补充 FC 的反应器中的累积甲烷产量和丙酸降解分别增加了 15.4%和 19.67%。从 FC 反应器中取出的培养物中以 H/CO 作为唯一底物时产生的甲烷较少，这表明 FC 反应器中的种间氢转移较弱。这些结果表明，在 FC 反应器中建立了直接种间电子转移（DIET）以改善性能。FeO 增加了细胞外聚合物中电子穿梭成分的分泌，增加了 FC 反应器中生物质的电子交换能力，从而进一步促进了 DIET。微生物群落分析证实，FC 反应器中与微生物相关的 DIET 的丰度高于对照组。
