间歇供电的微生物电解池改善甲酸预处理剩余污泥厌氧消化产甲烷  

Methane production from formic acid pretreated activated sludge in an intermittently powered microbial electrolysis cell

作　　者：李欣彤 仲司佳 张代钧[1,2] 尹向阳 杜豪敏 江瑞阳 LI Xintong;ZHONG Sijia;ZHANG Daijun;YIN Xiangyang;DU Haomin;JIANG Ruiyang(College of Environment and Ecology,Chongqing University,Chongqing 400045;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044)

机构地区：[1]重庆大学,环境与生态学院,重庆400045 [2]重庆大学,煤矿灾害动力学与控制国家重点实验室,重庆400044

出　　处：《环境科学学报》2024年第7期201-212,共12页Acta Scientiae Circumstantiae

基　　金：国家科学自然基金(No.51974039)。

摘　　要：厌氧消化(AD)是一种有前景的剩余污泥(WAS)资源化的技术,但存在底物利用率低、甲烷产率低和反应周期长等问题.本研究利用甲酸预处理技术促进WAS溶裂(FA-WAS),同时构建微生物电解池-厌氧消化(MEC-AD)体系,并引入间歇供电模式,旨在提高厌氧消化过程中底物甲烷产率和能量转换效率.与AD体系相比,MEC-AD体系的生物沼气中甲烷含量(67.8%)、累计甲烷产量(230.7 mL·g^(-1))和甲烷产率(19.5mL·g^(-1)·d-1)分别提高了19.2%、84.4%和59.8%,净能量转换效率达到41.7%.间歇供电(12 h-ON、12 h-OFF)模式下,该体系的生物沼气中甲烷含量(61.4%)、累计甲烷产量(157.2 mL·g^(-1))和甲烷产率(11.5 mL·g^(-1)·d^(-1))相较于AD体系分别提高6.2%、14.2%、13.9%,净能量转换效率达到64.0%;同连续模式相比其电能消耗降低了63%,净能量回收效率提高了34.8%.MEC的引入使Methanobacterium、Methanobrevibacter菌属得到富集,间歇供电中,Methanobacterium相对丰度较连续供电模式提高28.9%;Methanobacterium和Methanobrevibacter均是典型的氢营养型产甲烷菌,从而有利于甲烷的产生.MEC-AD体系提升了FA-WAS的厌氧产甲烷性能,间歇供电运行模式实现了低能耗下高甲烷产量,为WAS厌氧消化产甲烷提供了新途径.Anaerobic digestion(AD) is a promising technology for resource utilization of wasted activated sludge(WAS).However,it suffers from low substrate utilization,low methane yield and long reaction cycles.In this study,formic acid pretreatment is used to promote the dissolution of WAS(FAWAS),and constructed an microbial electrolysis cell coupled anaerobic digestion(MEC-AD) system.The intermittent power supply mode was introduced to improve the methane yield and energy conversion efficiency.Compared to the AD system,MEC-AD system increased the methane content(67.8%),cumulative methane production(230.7 mL·g^(-1) VSS) and methane yield(19.5 mL·g^(-1)·d-1) of the biogas by 19.2%,84.4 % and 59.8%,respectively,with a net energy conversion efficiency up to 41.7%.When the MEC-AD under the intermittent power supply(12 h-ON,12 h-OFF) modes,the methane content(61.4%),cumulative methane production(157.2 mL·g^(-1) VSS),and methane yield(11.5 mL·g^(-1)·d^(-1)) of the biogas are increased by 6.2%,14.2%,and 13.9%,respectively,with the net energy conversion efficiency of 64.0%,in comparison with the AD.The electrical energy consumption is reduced by 63.0% and the net energy recovery efficiency is increased by 34.8% compared with the continuous mode.Methanobacterium and Methanobrevibacter are enriched by the introduction of MEC.In the intermittent power supply mode,the relative abundance of Methanobacterium can increase by 28.9%.Methanobacterium and Methanobrevibacter are typical hydrogenotrophic methanogens,thus favoring methane production.The MEC-AD system improves the anaerobic methanogenesis performance of FA-WAS,and the intermittent power supply operation mode can achieve high methane production under low energy consumption.This study provides a new way for WAS anaerobic digestion to methane.

关 键 词：剩余污泥 厌氧消化 产甲烷 微生物电解池 间歇供电 

分 类 号：X703[环境科学与工程—环境工程]