>> Electrically regulating co-fermentation of sewage sludge and food waste towards promoting biomethane production and mass reduction
题名：Electrically regulating co-fermentation of sewage sludge and food waste towards promoting biomethane production and mass reduction
来源：Bioresource Technology
发表年代：2019年
作者：Zhongxiang Zhi, Yang Pan, Xueqin Lu, Guangyin Zhen*, Youcai Zhao, Xuefeng Zhu, Jianying Xiong, Tianbiao Zhao
Abstract Microbial electrolysis cell (MEC) was integrated into conventional anaerobic digestion (AD) system (i.e. MEC-AD) to electrochemically regulate the co-fermentation of food waste (FW) and sewage sludge (SS). Two anaerobic systems (i.e. MEC-AD, and single AD) were operated in parallel to explore the potential stimulation of electrical regulation in metabolic behaviors of FW and SS and subsequent biomethane production. The highest accumulative methane yield was achieved at an applied voltage of 0.4 V and the FW and SS ratio of 0.2:0.8, increasing by 2.8-fold than those in AD. The combined MEC-AD system mitigated N2O emission and considerably improved ammonia removal and the dewaterability of digestate, in contrast to AD. Scanning electron microscope (SEM) visualized the presence of a large number of rod-like and cocci-like electroactive microbes on the electrode surface. Electrical regulation stimulated the self-growth and proliferation of typical Methanobacterium and Methanosaeta, accordingly contributing to biomethane production greatly.
