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研究了广泛应用的农药2,4-二氯苯氧乙酸(2,4-D)存在对微生物燃料电池(microbial fuel cell,MFCs)产电性能、污染物去除及微生物群落结构的影响,并探讨了阳极预曝气对2,4-D的强化去除及产电影响.结果表明,向以乙酸钠为燃料的双室型微生物燃料电池阳极室内加入2,4-D,会降低系统输出电压,降低功率密度,增加内阻.当300 mg·L~(-1)的2,4-D与乙酸钠(850 mg·L~(-1))共存时,与乙酸钠单基质相比,最大功率密度从0.151 W·m~(-2)迅速下降到0.057 W·m~(-2),内阻相应从524Ω增加到1 230Ω.为了加快系统中2,4-D的去除,减少其对产电菌的抑制效应,采用阳极预曝气6 h的运行方式,显著提高了2,4-D去除效率,同时获得了0.42~0.47 V的最高输出电压.2,4-D加入后MFC阳极微生物群落结构发生了变化,选择出了多种2,4-D降解菌及具有2,4-D耐受能力的产电菌.研究表明,可以通过阳极预曝气方式强化2,4-D去除的同时从MFCs系统回收电能.
The effects of 2,4-dichlorophenoxyacetic acid (2,4-D), a widely used pesticide, on the electric performance, contaminant removal and microbial community structure of microbial fuel cells (MFCs) were studied and discussed The effect of anode pre-aeration on the removal of 2,4-D and the generation of electricity were studied.The results showed that the addition of 2,4-D to the anode compartment of bi-compartment microbial fuel cell using sodium acetate as fuel could reduce the system output voltage, Reduce the power density and increase the internal resistance.When 300 mg · L -1 2,4-D coexists with sodium acetate (850 mg · L -1), the maximum The power density decreases rapidly from 0.151 W · m -2 to 0.057 W · m -2, and the internal resistance increases from 524Ω to 1 230 Ω. In order to speed up the removal of 2,4-D in the system, The inhibitory effect of producing bacteria, using anode pre-aeration 6 h operation mode, significantly improve the 2,4-D removal efficiency, while the highest 0.42 ~ 0.47 V. The output voltage .2,4-D after adding MFC anode Microbial community structure has changed, select a variety of 2,4-D-degrading bacteria and 2,4-D tolerance of the producing bacteria.Studies show that, by way of anode pre-aeration to strengthen 2,4-D Removed from MFCs at the same time Energy recovery system.