Basic Research On Application Of Microbial Fuel Cell To Remove Organic Chlorine

The development of organic chlorinated compounds has greatly promoted social progress,but its refractoriness and toxicity also had a negative impact on human survival,and even harm.In this paper,2,4,6-trichlorophenol(2,4,6-TCP)was used as a model compound to degrade it by microbial fuel cell.The effects of initial pH,temperature,external resistance and initial concentration of 2,4,6-TCP on the degradation of 2,4,6-TCP by microbial fuel cell and the evolution of anodic microbial community in the process of acclimation were studied.The treatment methods of microbial fuel cell were compared with microbial direct degradation,electrochemical oxidation degradation and chemical degradation.Initial pH,temperature,external resistance and initial concentration of 2,4,6-TCP all affect the degradation of 2,4,6-TCP in microbial fuel cell.The results showed that the optimum conditions for the treatment of 2,4,6-TCP by microbial fuel cell were pH 7.0,25?,510 ?.The higher the initial concentration of 2,4,6-TCP,the lower the degradation rate of 2,4,6-TCP.When the initial concentration of 2,4,6-TCP was 30 mg/L,150 mg/L,300 mg/L,the degradation rate of 2,4,6-TCP for 7 days was 100%,89.96%,5 1.3 1%respectively.Geoalkalibacter,Alishewanella,Alcanivorax,Clostrium,Luteimonas are inhibited by 2,4,6-TCP,while Halomonas,Truepera,Rhodobacteraceae,Euzebyaceae are better adapt to the environment with 2,4,6-TCP,and may play a major role in the degradation of 2,4,6-TCP.Microbial direct degradation,electrochemical oxidation degradation and chemical degradation can degrate 2,4,6-TCP.The microbial direct degradation is slow,and the degradation rate under anaerobic conditions is higher than aerobic conditions.The degradation rates of 2,4,6-TCP under aerobic and anaerobic conditions for 40 days were 15%and 58.5%respectively for the initial concentration of 2,4,6-TCP was 15 mg/L.The electrochemical oxidation degradation of 2,4,6-TCP has a high degradation rate.The optimum degradation conditions are as follows:applied voltage 0.8 V,pH 7.When the initial concentration of 2,4,6-TCP was 10 mg/L,80 mg/L and 240 mg/L,the degradation rate of 2,4,6-TCP for 6 h was 80.59%,58.54%and 23.86%respectively at the applied voltage of 0.6 V,pH 7.0 and 35?.Compared with electrochemical oxidation degradation,microbial fuel cells degrade 2,4,6-TCP more thoroughly in the same time;and compared with microbial fuel cell method,chemical method is more suitable for treating solutions with higher initial concentration of 2,4,6-TCP.