生物电化学系统对4-氯硝基苯的降解

实验以驯化的4-氯硝基苯（4-CNB）降解菌为接种物，以碳刷为阴、阳极材料，构建了生物电化学系统，探讨了4-CNB不同进水浓度、不同外加电压对难降解、具有持久性毒性的有机污染物4-CNB降解效果的影响。结果表明：4-CNB不同进水浓度下，生物电化学系统对4-CNB的去除率均可达到99%，且实验采用的具有电化学活性的微生物对4-CNB表现出较好的耐受性；在不同外加电压下，4-CNB去除率最终也可达到99%，在外加电压为0.5V时，其去除效率最佳。此外，对比了相同浓度、相同外加电压下，生物电化学系统、非生物厌氧反应系统和开路状态生物系统对4-CNB降解效果的影响，结果表明，生物电化学系统降解效果最佳，可有效促进有机污染物4-CNB降解并提高其降解效率，2.5h后4-CNB去除率可达99.5%，非生物厌氧系统去除率为95.7%，而开路状态生物系统中，24h后4-CNB含量无显著变化。

Degradation of 4-chloronitrobenzene by bioelectrochemical system

This research used domesticated 4-chloronitrobenzene (4-CNB) degrading bacteria as inoculum, carbon brush as the cathode and anode materials. Bioelectrochemical system was constructed. The effect of different influent concentrations of 4-CNB and different applied voltages on the degradation of 4-CNB that has persistent toxicity were discussed. The results showed that the removal efficiency of 4-CNB could reach 99% in bioelectrochemical system under different initial concentrations, and the microbes with electrochemical activity used in the experiment showed better tolerance to 4-CNB. Under different applied voltages, the removal efficiency of 4-CNB could also reach 99%, and the reaction was in accordance with the first-order kinetics model. Under the applied voltage of 0.5V, the removal efficiency was the best. In addition, the effects of bioelectrochemical system, abiotic anaerobic reaction system and biological system on the degradation of 4-CNB were compared under the same concentration and the same applied voltage. The results showed that the remove efficiency of bio-electrochemical system was the best, which could effectively promote the degradation of organic pollutants 4-CNB and improve the remove efficiency. After 2.5h, the removal rate of 4-CNB was 99.5%, and the abiotic anaerobic system was 95.7%, While the content of 4-CNB was no significant change in the non-living anaerobic reactor after 24h.