Enhancing corn stalk-based anaerobic digestion with different types of zero-valent iron added during the acidification stage:Performance and mechanism  

作　　者：Xiang Liu Yue Liu Min Wang Qianzhen Deng Hao Yang 

机构地区：[1]College of Agricultural Science and Engineering,Hohai University,Nanjing 210098,China [2]State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China [3]National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution,Wenzhou University,Wenzhou 325035,China [4]Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse,Anhui Jianzhu University,Hefei 230009,China

出　　处：《Journal of Environmental Sciences》2024年第11期64-74,共11页环境科学学报（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities of China(No.B220202066);the Natural Science Foundation of Jiangsu Province(No.BK20200527);the Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse(No.2021EPC05).

摘　　要：Anaerobic digestion has been defined as a competitive approach to facilitate the recycling of corn stalks.However,few studies have focused on the role of direct interspecies electron transfer(DIET)pathway in the acidification stage under the addition of different particle sizes of zero-valent iron(ZVI).In this study,three types of ZVI,namely iron filings,iron powder and nanoscale iron,were investigated,respectively,to enhance its high-value conversion.Variations in volatile fatty acids(VFAs)and methane(CH4)production associated with the underlyingmechanisms were emphatically determined.Results indicated that the addition of ZVI could increase the concentration of VFAs,with the most outstanding performance observed with the use of nanoscale iron.Importantly,the conversion of propionic acid to acetic acid was driven by adding ZVI with no between-group differences in acidizing phase.Conversely,the substrate was more fully utilized when supplied with iron powder compared with other groups in methanogenic phase,thereby displaying the maximumCH4 yield with a value of 263.1 mL/(g total solids(TS)).However,adding nanoscale iron could signally shorten the digestion time(T80),saving 7 days in comparison to the group of iron powder.

关 键 词：Zero-valent iron Corn stalk Anaerobic digestion Volatile fatty acids METHANE 

分 类 号：X71[环境科学与工程—环境工程]