Biocathode constructed by traditional method has disadvantages of long starting time and low efficiency for removing persistent organic pollutants from waste water . For this , a novel method for recalcitrant organic pollutants degradation electrochemically active bacteria screening and acclimation was proposed .A novel biocathode used for pentachlorophenol (PCP) degradation was also built during this procedure . The effects of initial PCP concentration , redox mediator concentration and pH on the performance of biocathode were investigated .The optimized condition for PCP degradation on biocathode was also obtained .Experimental results indicated that starting time was reduced from 14 days to 3 days by employing this new method to construct biocathode .The current densities were decreased from -5 mA/m2 to-31 mA/m2 .When the applied potential was -400 mV ,the initial PCP concentration was 20 mg/L and pH was 6 .5 , the process could get an excellent removal rate in the experiments . After 100 hours of treatment ,the PCP removal rate and the total organic carbon (TOC ) removal rate on biocathode were respectively 2 .6 times and 2 .9 times higher than that in an abiotic electrochemical system .%利用传统方法构建的生物阴极在去除废水中的难降解有机污染物时往往启动时间较长、处理效果不佳．为此，提出一种用于筛选与驯化处理难降解有机污染物的电化学活性细菌方法，构建用于高效去除五氯酚（PC P ）的生物阴极．通过研究五氯酚的初始浓度、氧化还原介体浓度以及pH值等因素对生物阴极运行效果的影响，获得生物阴极去除五氯酚的最佳条件．实验结果表明：该方法使生物阴极的启动时间由14d缩短到3d，电流密度由－5 mA／m2下降到－31 mA／m2．当反应时间为100 h时，工作电极电势为－400 mV ，五氯酚的初始质量浓度为20 mg／L ，当pH＝6．5时，生物阴极的性能最佳，五氯酚和总有机碳（TOC）的去除率分别为电化学体系下的2．6倍和2．9倍．
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