Enhanced denitrification driven by a novel iron-carbon coupled primary cell:chemical and mixotrophic denitrification  

作　　者：Ruofan Wu Paramsothy Jeyakumar Nanthi Bolan Xu Zhai Hailong Wang Minghui Pan Jiapan Lian Liping Cheng Jiangzhou Li Minghei Hou Yonghe Cui Xiaoe Yang Kuai Dai 

机构地区：[1]MOE Key Laboratory of Environmental Remediation and Ecological Health,College of Environmental and Resources Science,Zhejiang University,Hangzhou 310058,China. [2]Environmental Sciences Group,School of Agriculture and Environment,Massey University,Private Bag 11222,Palmerston North 4442,New Zealand. [3]School of Agriculture and Environment,The University of Western Australia,Perth,WA 6009,Australia. [4]UWA Institute of Agriculture,The University of Western Australia,Perth,WA 6009,Australia. [5]School of Environmental and Chemical Engineering,Foshan University,Foshan,China. [6]Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China. [7]Yunnan Tobacco Company Yuxi Branch,102 Fenghuang Road,Hongta District,Yuxi 653100,Yunnan,China.

出　　处：《Biochar》2024年第1期66-80,共15页生物炭(英文)

基　　金：the project from Science and Technology Department of Yunnan Tobacco Cooperation(#202020530000241006);the key project from Zhejiang Science and Technology Bureaux(#2023C02002).

摘　　要：Iron-carbon micro-electrolysis system is a promising method for promoting electron transfer in nitrate removal.However,many traditional approaches involving simple physical mixing inevitably suffered from the confined iron-carbon contact area and short validity period,leading to the overuse of iron.Here,a ceramsite-loaded microscale zero-valent iron(mZVI)and acidified carbon(AC)coupled-galvanic cell(CMC)was designed to support chemical,autotrophic and heterotrophic denitrification.Long-term experiments were conducted to monitor the nitrogen removal performance of denitrification reactors filled with CMC and thus optimized the denitrification performance by improving fabrication parameters and various operating conditions.The denitrification contributions test showed that the chemical denitrification pathway contributed most to nitrate removal(57.3%),followed by autotrophic(24.6%)and heterotrophic denitrification pathways(18.1%).The microbial analysis confirmed the significant aggregation of related denitrifying bacteria in the reactors,while AC promoted the expression of relevant nitrogen metabolism genes because of accelerated uptake and utilization of iron complexes.Meanwhile,the electrochemical analysis revealed a significantly improved electron transfer capacity of AC compared to pristine carbon.Overall,our study demonstrated the application of a novel mZVI-AC coupled material for effective nitrate removal and revealed the potential impact of CMC in the multipathway denitrification process.

关 键 词：Multipathway denitrification Iron and carbon coupled-galvanic cell Nitrate removal Electron transfer capability 

分 类 号：X52[环境科学与工程—环境工程]