title: Bioelectrochemical Reduction of Fe(II)EDTA-NO in a Biofilm Electrode Reactor: Performance, Mechanism, and Kinetics.
abstract: A biofilm electrode reactor (BER) is proposed to effectively regenerate Fe(II)EDTA, a solvent for NOx removal from flue gas, from Fe(II)EDTA-NO, a spent solution. In this study, the performance, mechanism, and kinetics of the bioelectrochemical reduction of Fe(II)EDTA-NO were investigated. The pathways of Fe(II)EDTA-NO reduction were investigated via determination of nitrogen element balance in the BER and an abiotic electrode reactor. The experimental results indicate that the chelated NO (Fe(II)EDTA-NO) is reduced to N2 with N2O as an intermediate. However, the oxidation of NO occurred in the absence of Fe(II)EDTA in abiotic reactors. Furthermore, the accumulation of N2O was suppressed with the help of electricity. The preponderant electron donor for reduction of Fe(II)EDTA-NO was also confirmed via analysis of the electron conservation. About 87% of Fe(II)EDTA-NO was reduced using Fe(II)EDTA as the electron donor in the presence of both glucose and cathode electrons while the cathode electrons were utilized for the reduction of Fe(III)EDTA to Fe(II)EDTA. Michaelis-Menten kinetic constants of bioelectrochemical reduction of Fe(II)EDTA-NO were also calculated. The maximum reduction rate of Fe(II)EDTA-NO was 13.04 mol m(-3) h(-1), which is 50% higher than that in a conventional biofilter.
authors.affiliation: Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University (Yuquan Campus) , Hangzhou, 310027, China.|Institute of Environmental Engineering, Zhejiang University (Zijingang Campus) , Hangzhou, 310058, China.
authors.forename: Yinfeng
authors.initials: Y
authors.lastname: Xia
authors.affiliation: Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University (Yuquan Campus) , Hangzhou, 310027, China.
authors.forename: Jingkai
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University (Yuquan Campus) , Hangzhou, 310027, China.
authors.forename: Meifang
authors.initials: M
authors.lastname: Li
authors.affiliation: Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University (Yuquan Campus) , Hangzhou, 310027, China.
authors.forename: Shihan
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University (Yuquan Campus) , Hangzhou, 310027, China.
authors.forename: Sujing
authors.initials: S
authors.lastname: Li
authors.affiliation: Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University (Yuquan Campus) , Hangzhou, 310027, China.|Institute of Environmental Engineering, Zhejiang University (Zijingang Campus) , Hangzhou, 310058, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
mesh_terms: D000393:Air Pollutants / Q000737:chemistry / Q000378:metabolism; D018441:Biofilms; D019149:Bioreactors / Q000382:microbiology; D002614:Chelating Agents / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry / Q000378:metabolism*; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods; D004566:Electrodes; D004867:Equipment Design; D005296:Ferrous Compounds / Q000737:chemistry / Q000378:metabolism*; D007700:Kinetics; D009569:Nitric Oxide / Q000737:chemistry / Q000378:metabolism*; D010084:Oxidation-Reduction
chemical_list: D000393:Air Pollutants; D002614:Chelating Agents; D005296:Ferrous Compounds; D009569:Nitric Oxide; D004492:Edetic Acid