Institute of Environment Pollution Control and Treatment, Department of Environmental Engineering, Zhejiang University, Hangzhou, 310058, China.
Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, 310058, China.
Environ Sci Pollut Res Int. 2019 May;26(13):13002-13013. doi: 10.1007/s11356-019-04751-9. Epub 2019 Mar 20.
Coupled bioelectrochemical system-upflow anaerobic sludge blanket (BES-UASB) was utilized for wastewater treatment containing 2,4-dichloronitrobenzene (DClNB). The results indicated that a proper voltage enhanced the DClNB reduction, however, over high voltage presented a negative impact (2.0 V). Synergistic effect of external voltage and anaerobic sludge was observed, and dechlorination efficiency reached 57.8 ± 5.4% in the coupled BES, which was higher than the sum of anaerobic sludge and electric system (48.2%). Moreover, the coupled system was more tolerant of high salinity and pollutant concentration. Dehydrogenase activity (DHA) was related to microbial electron transfer activity and DHA reached a maximum 453 ± 33 μgTF gVSS h in the coupled reactor which was 1.6-fold that of the control, meanwhile, extracellular polymeric substances (EPS) content was significantly enhanced in the presence of external voltage. In summary, the coupled BES-UASB systems could be an alternative for removal of recalcitrant pollutants such as DClNB.
采用耦合生物电化学系统-上流式厌氧污泥床（BES-UASB）处理含有 2,4-二氯硝基苯（DClNB）的废水。结果表明，适当的电压可以增强 DClNB 的还原，但过高的电压会产生负面影响（2.0 V）。观察到外加电压和厌氧污泥的协同作用，在耦合 BES 中脱氯效率达到 57.8±5.4%，高于厌氧污泥和电系统的总和（48.2%）。此外，该耦合系统对高盐度和污染物浓度更具耐受性。脱氢酶活性（DHA）与微生物电子传递活性有关，在耦合反应器中 DHA 达到最大值 453±33 μgTF gVSS h，是对照的 1.6 倍，同时，在外加电压存在下，细胞外聚合物（EPS）含量显著增加。总之，耦合 BES-UASB 系统可以作为去除 DClNB 等难降解污染物的一种替代方法。
