微生物燃料电池强化去除农药2,4-二氯苯氧乙酸及同步产电性能

发布时间：2018-03-18 02:19

本文选题：微生物燃料电池　切入点：-二氯苯氧乙酸　出处：《环境科学》2017年03期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:The effects of the widely used pesticide 2n4- dichlorophenoxyacetic acid 24-D on the electricity production, pollutant removal and microbial community structure of microbial fuel cells were studied. The effect of anodic preaeration on the enhanced removal and generation of 2H4 D was also discussed. The results showed that the addition of 2H4 D to the anode chamber of a dual chamber microbial fuel cell with sodium acetate as fuel could reduce the output voltage and power density of the system. The maximum power density decreased rapidly from 0.151 W 路m ~ (-1) to 0.057 W 路m ~ (-1), and the internal resistance increased from 524 惟 to 1 230 惟. In order to accelerate the removal of 2H _ 4-D in the system, the maximum power density decreased rapidly from 0.151 W 路m ~ (-1) to 0.057 W 路m ~ (2) ~ (-2), and the internal resistance increased from 524 惟 to 1 230 惟 when it co-existed with sodium acetate (850 mg 路L ~ (-1) 路L ~ (-1)). In order to reduce the inhibitory effect on the electricity-producing bacteria, the removal efficiency of 24-D was significantly improved by using anodic pre-aeration for 6 h, and the microbial community structure of MFC anode was changed after adding the highest output voltage of 0.42V 0.47V. A variety of 2n4-D degrading bacteria and 24-D tolerant electro producing bacteria were selected. The results showed that 2n4-D removal could be enhanced by anodic preaeration and the electric energy could be recovered from the MFCs system at the same time.
【作者单位】：北京师范大学环境学院水环境模拟国家重点实验室;
【基金】：高等学校博士学科点专项科研基金项目(20130003110028)
【分类号】：TM911.45;X703.1

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