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.%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.
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