生物阴极BES降解对硝基苯酚影响因素研究

Influence factors for p-nitrophenol degradation in biocathode bioelectrochemical system

摘要:

为研究生物阴极微生物电化学系统（biocathode bioelectrochemical system, Bioc-BES）对硝基芳香烃降解在实际生产中的应用,分析了外加电压、磷酸盐缓冲溶液浓度（PBS）、外电阻对对硝基苯酚（PNP）降解的影响.结果表明,在外电阻为10 Ω时,随着外加电压由0.2 V增加到0.6 V,PNP去除速率常数由(0.024±0.005) h^-1增加到(0.098±0.001) h^-1,0.5 V是PNP去除最佳外加电压.当磷酸盐缓冲溶液浓度由10 mmol/L增加到200 mmol/L,PNP去除速率常数由(0.039±0.004) h^-1增加到(0.071±0.011) h^-1,50 mmol/L磷酸盐缓冲液浓度为最适PNP去除浓度.外电阻由1 Ω增加到100 Ω对PNP的去除没有显著影响.表明生物阴极BES降解PNP具有良好的环境适应力,生物阴极BES为PNP生物降解提供了新的途径.

Abstract:

To determine the influence factors of biocathode bioelectrochemical system(bioc-BES) used for p-nitrophenol (PNP) degradation in actual production, the effects of applied voltage, PBS concentrations, and external resistance on the PNP removal were studied. The results showed that when external resistance was 10 Ω, with the increase of applied voltage from 0.2 V to 0.6 V, the PNP degradation rate constant increased from (0.024±0.005) h^-1to (0.098±0.001) h^-1,and 0.5 V was the best applied voltage for PNP removal. With the phosphate buffer solution concentration increasing from 10 mmol/L to 200 mmol/L, the PNP degradation rate constant increased from (0.039±0.004) h^-1 to (0.071±0.011) h^-1, and 50 mmol/L was optimal for PNP removal. The external resistance, which increased from 1 Ω to 100 Ω, had no obvious difference on PNP removal. These results indicated that the biocathode BES is well adaptable for environment and able to provide a theoretical basis for efficient PNP removal in practical wastewater treatment.