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.
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.
Water Res. 2014 Dec 15;67:11-8. doi: 10.1016/j.watres.2014.09.003. Epub 2014 Sep 16.
Coupling of a bioelectrochemical system (BES) into the upflow anaerobic sludge blanket (UASB) was developed for enhanced p-nitrophenol (PNP) removal in this study. Compared to the control UASB reactor, both PNP removal and the formation of its final reductive product p-aminophenol (PAP) were notably improved in the UASB-BES system. With the increase of current density from 0 to 4.71 A m(-3), the rates of PNP removal and PAP formation increased from 6.16 ± 0.11 and 4.21 ± 0.29 to 6.77 ± 0.00 and 6.11 ± 0.28 mol m(-3) d(-1), respectively. More importantly, the required dosage of organic cosubstrate was significantly reduced in the UASB-BES system than that in the UASB reactor. Organic carbon flux analysis suggested that biogas production from organic cosubstrate was seriously suppressed while direct anaerobic reduction of PNP was not remarkably affected by current input in the UASB-BES system. This study demonstrated that the UASB-BES coupling system had a promising potential for the removal of nitrophenol-containing wastewaters especially without adequate organic cosubstrates inside.
本研究将生物电化学系统 (BES) 与上流式厌氧污泥床 (UASB) 耦合，以提高对 p-硝基苯酚 (PNP) 的去除效果。与对照 UASB 反应器相比，UASB-BES 系统中 PNP 的去除和最终还原产物对氨基苯酚 (PAP) 的生成均得到显著改善。随着电流密度从 0 增加到 4.71 A m(-3)，PNP 的去除速率和 PAP 的生成速率分别从 6.16 ± 0.11 和 4.21 ± 0.29 增加到 6.77 ± 0.00 和 6.11 ± 0.28 mol m(-3) d(-1)。更重要的是，与 UASB 反应器相比，UASB-BES 系统中所需的有机共基质剂量显著减少。有机碳通量分析表明，在 UASB-BES 系统中，有机共基质的沼气生成受到严重抑制，而电流输入对 PNP 的直接厌氧还原没有显著影响。本研究表明，UASB-BES 耦合系统具有去除含硝基酚废水的巨大潜力，特别是在内部缺乏足够有机共基质的情况下。
