title: Bioelectrochemical system for recalcitrant p-nitrophenol removal.
abstract: Bioelectrochemical system (BES) for recalcitrant p-nitrophenol (PNP) removal was investigated in this study. Effective removal of PNP at rates up to 9.14 ± 0.48 mol m(-3)d(-1) was achieved at an energy consumption as low as 0.010 ± 0.002 kWh mol(-1) PNP. PNP removal rate was enhanced with negative cathode potential, increased influent PNP concentration and shortened hydraulic retention time (HRT). Although the coulombic efficiencies at the anode did not exceed 40%, coulombic efficiencies for PNP removal at the cathode were above 70% at various cathode potentials. Compared with conventional anaerobic process, the cosubstrate dosage in BES was significantly reduced due to the high coulombic efficiencies at the cathode. p-Aminophenol (PAP) was identified as the dominant product of PNP reduction at the abiotic graphite cathode of BESs. This study demonstrated that the BES had a potential for efficient removal of nitrophenol pollutants from wastewater.
authors.affiliation: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu Province, China.
authors.forename: Jinyou
authors.initials: J
authors.lastname: Shen
authors.forename: Cencen
authors.initials: C
authors.lastname: Feng
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Fei
authors.initials: F
authors.lastname: Jia
authors.forename: Xiuyun
authors.initials: X
authors.lastname: Sun
authors.forename: Jiansheng
authors.initials: J
authors.lastname: Li
authors.forename: Weiqing
authors.initials: W
authors.lastname: Han
authors.forename: Lianjun
authors.initials: L
authors.lastname: Wang
authors.forename: Yang
authors.initials: Y
authors.lastname: Mu
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004563:Electrochemistry / Q000379:methods*; D009596:Nitrophenols / Q000302:isolation & purification*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D009596:Nitrophenols; C024836:4-nitrophenol