Ultrasonication as anaerobic digestion pretreatment to improve sewage sludge methane production:Performance and microbial characterization  

作　　者：Kai Zhao Ge Song Chaojie Lu Jiaqi Wang Ruiping Liu Chengzhi Hu 

机构地区：[1]State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Center for Water and Ecology,State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China

出　　处：《Journal of Environmental Sciences》2024年第12期15-27,共13页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52192683,51925807,and 52221004);the National Science Fund for Distinguished Young Scholars of China(No.52125003);the Key Research Program of Frontier Sciences,CAS(No.ZDBS-LY-DQC014).

摘　　要：A large amount of sludge is inevitably produced during sewage treatment.Ultrasonication(US)as anaerobic digestion(AD)pretreatment was implemented on different sludges and its effects on batch and semi-continuous AD performance were investigated.US was ef-fective in sludge SCOD increase,size decrease,and CH_(4)production in the subsequent AD,and these effects were enhanced with an elevated specific energy input.As indicated by semi-continuous AD experiments,the mean daily CH_(4)production of US-pretreated A^(2)O-,A^(2)O-MBR-,and AO-AO-sludgewere 176.9,119.8,and 141.7 NmL/g-VSadded,whichwere 35.1%,32.1%and 78.2%higher than methane production of their respective raw sludge.The US of A^(2)O-sludge achieved preferable US effects and CH_(4)production due to its high organic con-tent andweak sludge structure stability.In response to US-pretreated sludge,amore diverse microbial community was observed in AD.The US-AD system showed negative net energy;however,it exhibited other positive effects,e.g.,lower required sludge retention time and less residual total solids for disposal.US is a feasible option prior to AD to improve anaer-obic bioconversion and CH_(4)yield although further studies are necessary to advance it in practice.

关 键 词：Ultrasonication Waste activated sludge Anaerobic digestion CH_(4)production Microbial community 

分 类 号：X703[环境科学与工程—环境工程]