| 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 |
| 摘要点击 2937 全文点击 1208 投稿时间：2016-08-19 修订日期：2016-10-17 |
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| 中文关键词 微生物燃料电池 2,4-二氯苯氧乙酸 阳极曝气 生物降解 难降解有机物 |
| 英文关键词 microbial fuel cell(MFC) 2,4-dichlorophenoxyacetic acid anode aeration biodegradation recalcitrant organics |
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| 中文摘要 |
| 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（850mg·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524 Ω增加到1230 Ω.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. |
| 英文摘要 |
| This study investigated the effects of a widely used herbicide 2,4-dichlorophenoxyacetic acid on power generation, pollutants removal from microbial fuel cells (MFCs) and microbial community changes, and also explored anode pre-aeration for enhanced 2,4-D removal and power generation. The results showed that when 2,4-D was inputted to the anode chamber of MFCs which was previously enriched with acetate sodium as the fuel, the voltage output and power density declined and the internal resistance increased apparently. The maximum power density declined to 0.057 W·m-2 in the presence of 300 mg·L-1 2,4-D comparing to 0.151 W·m-2 obtained with acetate alone (850 mg·L-1), and the internal resistance increased from 524 Ω to 1230 Ω correspondingly. To accelerate 2,4-D removal rate and reduce its inhibition to anode exoelectrogens, 6h pre-aeration was applied to the anode chamber. Fast removal of 2,4-D was achieved during aeration period and simultaneous high maximum voltage output (0.42-0.47 V) was obtained. Anode microbial community changed after 2,4-D addition and several 2,4-D degrading bacteria and 2,4-D tolerant exoelectrogen were enriched. MFCs could be used for 2,4-D removal and simultaneous power generation through anode pre-aeration. |
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