基于铁阳极的生物阴极自养反硝化效能影响因素探究  

Parameters’ optimization of autotrophic denitrification on bio-cathode with iron as anode

作　　者：王思凡 刘冰茵 谭国涛 王茹 袁林江[1,2,3] WANG Sifan;LIU Bingyin;TAN Guotao;WANG Ru;YUAN Linjiang(School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi’an 710055;Key Laboratory of Environmental Engineering of Shaanxi Province,Xi’an 710055;Key Laboratory of Northwest Water Resources and Environmental Ecology Ministry of Education,Xi’an 710055)

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]陕西省环境工程重点实验室,西安710055 [3]西北水资源环境与生态教育部重点实验室,西安710055

出　　处：《环境科学学报》2022年第8期137-145,共9页Acta Scientiae Circumstantiae

基　　金：陕西高校青年创新团队(2020);国家自然科学基金青年项目(No.51808433)。

摘　　要：利用微生物燃料电池(Microbial fuel cell,MFC)装置耦合零价铁脱氮和生物阴极,研发基于铁阳极的新型生物脱氮技术,可有效避免脱氮过程中外源有机物的添加,降低污水处理成本,减少二次污染.本文以MFC装置为平台,零价铁为阳极,附着生物膜的碳刷为阴极,组成零价铁自养反硝化装置.在控制变量的条件下,采用单因素试验法探究不同起始pH(5~9)、不同外接电阻(50~2000Ω)、不同阴极电导率(0~232g·L^(-1))和不同起始基质浓度(42~800 mg·L^(-1))对零价铁自养反硝化效能和MFC产电性能的影响.结果表明,以脱氮作为首要目标,产电作为次要目标时,零价铁生物自养反硝化体系最佳起始pH为7,最佳起始硝氮浓度为200 mg·L^(-1),最佳阴极电导率为添加116 g·L^(-1),最佳外接电阻为1000Ω.对自养反硝化效能影响因素的探究将有助于优化反应条件,探明碳阴极生物脱氮过程的主要干扰因素,提升生物自养反硝化技术效能.A novel microbial fuel cell(MFC) was set up to perform autotrophic denitrification by coupling iron-dependent and bio-cathodic denitrification,named autotrophic denitrification on bio-cathode with iron anode was proposed and investigated. The novel MFC effectively avoids the addition of exogenous organic carbon,reducing the treatment costs and the risk of secondary pollution. In the MFC,an iron plate was used as anode,while a carbon brush attached with denitrifier as biocathode. The effects of initial pH(5~9),external resistance(50~2000 Ω),conductivity(0~232g·L^(-1)),and substrate concentration(42~800 mg·L^(-1))on denitrification efficiency and power generation efficiency were investigated. Results suggested initial pH,substrate concentration,conductivity and external resistance were 7.0,200 mg·L^(-1),116 g·L^(-1)and 1000 Ω when targeting denitrification.The investigation will help to explore the main influencing factors,optimize the process and improve the denitrification efficiency using MFC.

关 键 词：自养反硝化 微生物燃料电池 pH值 基质浓度 电导率 外接电阻 

分 类 号：X171[环境科学与工程—环境科学] X703