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Previous work showed that the Fe(II)EDTA concentration was critical for the NO<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub> 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 NO<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub> 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)<jats:sub>3<\/jats:sub>. 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.<\/jats:p>","DOI":"10.1038\/srep18876","type":"journal-article","created":{"date-parts":[[2016,1,8]],"date-time":"2016-01-08T11:28:19Z","timestamp":1452252499000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Pathway of FeEDTA transformation and its impact on performance of NOx removal in a chemical absorption-biological reduction integrated process"],"prefix":"10.1038","volume":"6","author":[{"given":"Wei","family":"Li","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jingkai","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yinfeng","family":"Xia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nan","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sujing","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shihan","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2016,1,8]]},"reference":[{"key":"BFsrep18876_CR1","doi-asserted-by":"publisher","first-page":"443","DOI":"10.1016\/j.scitotenv.2014.07.055","volume":"496","author":"L Guo","year":"2014","unstructured":"Guo, L. et al. 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