Xu X.-JWu Y.-NXiao Q.-YXie PRen N.-QYuan Y.-XLee D.-JChen C.DUU-JONG LEE2022-03-222022-03-22202200139351https://www.scopus.com/inward/record.uri?eid=2-s2.0-85121256595&doi=10.1016%2fj.envres.2021.112541&partnerID=40&md5=181d650ddccb4f61b7199e763e9e1e2chttps://scholars.lib.ntu.edu.tw/handle/123456789/598157Chemical absorption-biological reduction (CABR) process is an attractive method for NOX removal and Fe(II)EDTA regeneration is important to sustain high NOX removal. In this study a sustainable and eco-friendly sulfur cycling-mediated Fe(II)EDTA regeneration method was incorporated in the integrated biological flue gas desulfurization (FGD)-CABR system. Here, we investigated the NOX and SO2 removal efficiency of the system under three different flue gas flows (100 mL/min, 500 mL/min, and 1000 mL/min) and evaluated the feasibility of chemical Fe(III)EDTA reduction by sulfide in series of batch tests. Our results showed that complete SO2 removal was achieved at all the tested scenarios with sulfide, thiosulfate and S0 accumulation in the solution. Meanwhile, the total removal efficiency of NOX achieved ?100% in the system, of which 3.2%–23.3% was removed in spray scrubber and 76.7%–96.5% in EGSB reactor along with no N2O emission. The optimal pH and S2?/Fe(III)EDTA for Fe(II)EDTA regeneration and S0 recovery was 8.0 and 1:2. The microbial community analysis results showed that the cooperation of heterotrophic denitrifier (Saprospiraceae_uncultured and Dechloromonas) and iron-reducing bacteria (Klebsiella and Petrimonas) in EGSB reactor and sulfide-oxidizing, nitrate-reducing bacteria (Azoarcus and Pseudarcobacter) in spray scrubber contributed to the efficient removal of NOX in flue gas. ? 2021 Elsevier Inc.Fe(II)EDTA regenerationFlue gasNOXS0 recoverySO2edetic acidnitric oxidesulfatesulfidesulfursulfur dioxidethiosulfateaccumulationbiological analysismicrobial communityregenerationArticleAzoarcusbacteriumchemical absorption biological reductionchemical reactioncontrolled studyDechloromonasdenitrifying bacteriumdesulfurizationflue gasheterotrophyKlebsiellanonhumanPetrimonasPseudarcobacterSaprospiraceaesulfide oxidizing bacteriumsulfur cyclewaste component removal[SDGs]SDG12[SDGs]SDG13journal article10.1016/j.envres.2021.112541349150322-s2.0-85121256595