Effect of nitrite on hydrolysis-acidification, biogas production and microbial community in semi-continuous two-phase anaerobic digestion of sewage sludge  

作　　者：Qian Sheng Yiqing Lu Shijie Yuan Xiaowei Li Xiaohu Dai Yali Guo Bin Dong 

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China [2]School of Environmental and Chemical Engineering,Organic Compound Pollution Control Engineering,Ministry of Education,Shanghai University,Shanghai 200444,China [3]Shanghai Investigation Design&Research Institute Co.Ltd.,Shanghai 200335,China [4]YANGTZE Eco-Environment Engineering Research Center,China Three Gorges Corporation,Beijing 100038,China

出　　处：《Journal of Environmental Sciences》2023年第4期434-444,共11页环境科学学报（英文版）

基　　金：supported by the China Three Gorges Group Co.LTD (No.202003080);the National Key Research and Development Project (Nos.2020YFC1908702,2021YFC_(3)200704)。

摘　　要：Previous study found that the pre-treatment of sewage sludge with nitrite improves the biogas production during the mono/two-phase anaerobic digestion (AD) using batch biochemical methane potential tests.In this study,the effects of nitrite on hydrolysisacidification,biogas production,volatile solids destruction and microbial composition in semi-continuous two-phase AD of sewage sludge were investigated.The addition of nitrite promotes sludge organic matter solubilization (+484%) and VFAs production (+98.9%),and causes an increase in the VS degradation rate during the AD process (+8.7%).The comparison of biogas production from the acidogenic and methanogenic reactors with or without the addition of nitrite implies that the nitrite has no significant effect on the overall biogas production of two-phase sludge AD process.High-throughput sequencing analysis shows that the microbial communities of bacteria and archaea in two-phase AD reactors significantly changes after the addition of nitrite.Vulcanibacillus (bacteria) and Candidatus Methanofastidiosum (archaea) become the dominant genera in the acidogenic and methanogenic reactors with the nitrite respectively.These findings provide new insights about using nitrite to promote the organic matter degradation of sewage sludge in a semicontinuous two-phase AD system.

关 键 词：Sewage sludge BIOENERGY Methane production NITRITE Semi-continuous two-phase anaerobic digestion 

分 类 号：X703[环境科学与工程—环境工程] X172