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.
J Hazard Mater. 2012 Mar 30;209-210:516-9. doi: 10.1016/j.jhazmat.2011.12.065. Epub 2012 Jan 9.
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.
本研究考察了用于难处理的对硝基苯酚（PNP）去除的生物电化学系统（BES）。在低至 0.010 ± 0.002 kWh mol(-1) PNP 的能量消耗下，实现了高达 9.14 ± 0.48 mol m(-3)d(-1) 的有效 PNP 去除率。随着阴极电势的降低、进水 PNP 浓度的增加和水力停留时间（HRT）的缩短，PNP 的去除率得到了提高。尽管阳极的库仑效率没有超过 40%，但在各种阴极电势下，阴极对 PNP 的去除的库仑效率均高于 70%。与传统的厌氧工艺相比，由于阴极的高库仑效率，BES 中的共基质用量显著减少。在 BES 的非生物石墨阴极上，鉴定出对氨基苯酚（PAP）是 PNP 还原的主要产物。本研究表明，BES 具有从废水中有效去除硝基酚污染物的潜力。
