Enhanced methane recovery and exoelectrogen-methanogen evolution from low-strength wastewater in an up-flow biofilm reactor with conductive granular graphite fillers  

作　　者：Zechong Guo Lei Gao Ling Wang Wenzong Liu Aijie Wang 

机构地区：[1]State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150001, China [2]Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Beijing 100085, China＊

出　　处：《Frontiers of Environmental Science & Engineering》2018年第4期131-140,共10页环境科学与工程前沿（英文）

基　　金：This research was supported by the National Natural Science Foundation of China （Grant No. 51578534）, and Youth Innovation Promotion Association CAS （No. 2017062）.

摘　　要：Methane production from low-strength wastewater （LSWW） is generally difficult because of the low metabolism rate of methanogens. Here, an up-flow biofilm reactor equipped with conductive granular graphite （GG） as fillers was developed to enhance direct interspecies electron transfer （DIET） between syntrophie electroactive bacteria and methanogens to stimulate methanogcnesis process. Compared to quartz sand fillers, using condnctive fillers significantly enhanced methane production and accelerated the start-up stage ofbJ.ofilm reactor. At HRT of 6 h, the average methane production rate and methane yield of reactor with GG were 0.106 m3/（m3.d） and 74.5 L/kg COD, which increased by 34.3 times and 22.4 times respectively compared with the reactor with common quartz sand fillers. The microbial cornmunity analysis revealed that methanogens structure was significantly altered and the archaea that are involved in DIET （such as Methanohacterium） were enriched in GG fillet- The beneficial effects ot conductive fillers on methane production implied a practical strategy tbr efficient methane recovery from LSWW.Methane production from low-strength wastewater （LSWW） is generally difficult because of the low metabolism rate of methanogens. Here, an up-flow biofilm reactor equipped with conductive granular graphite （GG） as fillers was developed to enhance direct interspecies electron transfer （DIET） between syntrophie electroactive bacteria and methanogens to stimulate methanogcnesis process. Compared to quartz sand fillers, using condnctive fillers significantly enhanced methane production and accelerated the start-up stage ofbJ.ofilm reactor. At HRT of 6 h, the average methane production rate and methane yield of reactor with GG were 0.106 m3/（m3.d） and 74.5 L/kg COD, which increased by 34.3 times and 22.4 times respectively compared with the reactor with common quartz sand fillers. The microbial cornmunity analysis revealed that methanogens structure was significantly altered and the archaea that are involved in DIET （such as Methanohacterium） were enriched in GG fillet- The beneficial effects ot conductive fillers on methane production implied a practical strategy tbr efficient methane recovery from LSWW.

关 键 词：Low-strength wastewater Methane production Conductive filler Microbial community structure 

分 类 号：X703[环境科学与工程—环境工程] TL351.6[核科学技术—核技术及应用]