Bioenergy recovery and carbon emissions benefits of short-term bio-thermophilic pretreatment on low organic sewage sludge anaerobic digestion:A pilot-scale study  

作　　者：Hui Wang Xiang Fu Haozhe Huang Danni Shen Dongdong Fan Liming Zhu Xiaohu Dai Bin Dong 

机构地区：[1]College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China [2]Yangtze Eco-Environment Engineering Research Center,China Three Gorges Corporation,Beijing 100038,China [3]Yangtze River Eco-Environmental Engineering Research Center,Shanghai Investigation,Design and Research Institute Co.,LTD,Shanghai 200092,China [4]China Construction Third Engineering Bureau First Engineering Co.,Ltd.,Wuhan 430000,China

出　　处：《Journal of Environmental Sciences》2025年第2期321-335,共15页环境科学学报(英文版)

基　　金：supported by the National Key Research and Development Project (Nos.2020YFC1908702 and 2021YFC3200700);the National Natural Science Foundation of China (Nos.52192684 and 52192680).

摘　　要：Sewage sludge in cities of Yangzi River Belt,China,generally exhibits a lower organic content and higher silt contentdue to leakage of drainage system,which caused low bioenergy recovery and carbon emission benefits in conventional anaerobic digestion(CAD).Therefore,this paper is on a pilot scale,a bio-thermophilic pretreatment anaerobic digestion(BTPAD)for low organic sludge(volatile solids(VS)of 4%)was operated with a long-term continuous flow of 200 days.The VS degradation rate and CH_(4) yield of BTPAD increased by 19.93%and 53.33%,respectively,compared to those of CAD.The analysis of organic compositions in sludge revealed that BTPAD mainly improved the hydrolysis of proteins in sludge.Further analysis of microbial community proportions by high-throughput sequencing revealed that the short-term bio-thermophilic pretreatment was enriched in Clostridiales,Coprothermobacter and Gelria,was capable of hydrolyzing acidified proteins,and provided more volatile fatty acid(VFA)for the subsequent reaction.Biome combined with fluorescence quantitative polymerase chain reaction(PCR)analysis showed that the number of bacteria with high methanogenic capacity in BTPAD was much higher than that in CAD during the medium temperature digestion stage,indicating that short-term bio-thermophilic pretreatment could provide better methanogenic conditions for BTPAD.Furthermore,the greenhouse gas emission footprint analysis showed that short-term bio-thermophilic pretreatment could reduce the carbon emission of sludge anaerobic digestion system by 19.18%.

关 键 词：Sludge Anaerobic digestion Bio-thermophilic pretreatment Pilot scale Molecular microbiology Carbon emissions 

分 类 号：X70[环境科学与工程—环境工程]