title: Effective biodegradation of nitrate, Cr(VI) and p-fluoronitrobenzene by a novel three dimensional bioelectrochemical system.
abstract: p-Fluoronitrobenzene (p-FNB) was degraded in a novel three dimensional bioelectrochemical system (3D BES) and potentially utilized as carbon source for achieving both nitrate (NO3(-)−N) and Cr(VI) reduction. For single NO3(-)−N and Cr(VI) removal, 200 mg L(-1) NO3(-)−N and 100 mg L(-1) Cr(VI) could be almost completely converted to N2 and Cr(III) at current 50 mA. For single p-FNB degradation, 100 mg L(-1) p-FNB was completely degraded at current 50 mA. The critical current for defluorination was 40 mA, and the intermediate product p-fluoroaniline (p-FA) tended to decrease when current was higher than 40 mA. When NO3(-)−N, Cr(VI), and p-FNB were both coexisted in this system, the average NO3(-)−N, Cr(VI), and p-FNB removal efficiencies slightly decreased with addition of carbon source. Without carbon source, NO3(-)−N and Cr(VI) removal rates reached 34.45% and 41.38% with 91.02% p-FNB degradation, proving that NO3(-)−N and Cr(VI) could be reduced by degrading p-FNB in the BES.
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Chen
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China. Electronic address: hongyuwangcc@126.com.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Civil Engineering, Wuhan University, Wuhan 430072, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Yang
mesh_terms: D001673:Biodegradation, Environmental; D002244:Carbon / Q000737:chemistry / Q000378:metabolism; D002857:Chromium / Q000032:analysis / Q000378:metabolism*; D055664:Electrochemical Techniques; D009566:Nitrates / Q000032:analysis / Q000378:metabolism*; D009578:Nitrobenzenes / Q000032:analysis / Q000378:metabolism*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D002244:Carbon; D002857:Chromium; D009566:Nitrates; D009578:Nitrobenzenes; D062065:Wastewater; C046306:1-fluoro-2-nitrobenzene; C074702:chromium hexavalent ion
keywords: Bioelectrochemical; Cr(VI); Nitrate; p-Fluoronitrobenzene