title: Pathway of FeEDTA transformation and its impact on performance of NOx removal in a chemical absorption-biological reduction integrated process.
abstract: A novel chemical absorption-biological reduction (CABR) integrated process, employing ferrous ethylenediaminetetraacetate (Fe(II)EDTA) as a solvent, is deemed as a potential option for NOx removal from the flue gas. Previous work showed that the Fe(II)EDTA concentration was critical for the NOx removal in the CABR process. In this work, the pathway of FeEDTA (Fe(III)/Fe(II)-EDTA) transformation was investigated to assess its impact on the NOx removal in a biofilter. Experimental results revealed that the FeEDTA transformation involved iron precipitation and EDTA degradation. X-ray photoelectron spectroscopy analysis confirmed the iron was precipitated in the form of Fe(OH)3. The iron mass balance analysis showed 44.2% of the added iron was precipitated. The EDTA degradation facilitated the iron precipitation. Besides chemical oxidation, EDTA biodegradation occurred in the biofilter. The addition of extra EDTA helped recover the iron from the precipitation. The transformation of FeEDTA did not retard the NO removal. In addition, EDTA rather than the iron concentration determined the NO removal efficiency.
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
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.|Zhejiang Industrial Environmental Protection Design &Research Institute Co., Ltd., Hangzhou, 310035, China.
authors.forename: Lei
authors.initials: L
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.|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: Nan
authors.initials: N
authors.lastname: Liu
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.
authors.forename: Shihan
authors.initials: S
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D061808:Air Filters; D001426:Bacterial Proteins; D001673:Biodegradation, Environmental; D019149:Bioreactors; D058440:Denitrification; D004492:Edetic Acid / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry* / Q000378:metabolism; D007700:Kinetics; D009589:Nitrogen Oxides / Q000737:chemistry / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D052638:Particulate Matter / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D001426:Bacterial Proteins; D005296:Ferrous Compounds; D009589:Nitrogen Oxides; D052638:Particulate Matter; C055526:Fe(II)-EDTA; D004492:Edetic Acid; D007501:Iron