School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0512, USA; School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
Bioresour Technol. 2021 Feb;322:124534. doi: 10.1016/j.biortech.2020.124534. Epub 2020 Dec 16.
Tetracycline (TC) transformation in the anode of an air cathode microbial fuel cell (MFC) and in the cathode of an MFC-Fenton system was investigated. TC at 10 mg/L in the anolyte was removed by 43-74% in 14-d cycles, mainly attributed to adsorption. The electrochemical activity, COD and acetate consumption of the anodic biofilm were inhibited by TC; inhibition was reversed when TC addition was stopped. Over 84 d of MFC operation with TC, Geobacter and Mycobacterium in the anode biofilm decreased, while Janthinobacterium and Comamonas increased. Over 99% of TC at 10-40 mg/L was removed within 8 h in the MFC-Fenton cathode. O•/HO• and •OH were responsible for the cathodic TC degradation. The maximum current was 0.93 mA (at 250 Ω) and increased by 36.3% by the MFC-Fenton reaction. Cathodic MFC-Fenton is an efficient and energy-saving process for TC removal, compared to slow and problematic anodic TC bio-oxidation.
研究了四环素（TC）在空气阴极微生物燃料电池（MFC）阳极和 MFC-Fenton 系统阴极中的转化。在 14 天的循环中，阳极电解液中浓度为 10mg/L 的 TC 被去除了 43-74%，主要归因于吸附作用。TC 抑制了阳极生物膜的电化学活性、COD 和乙酸盐的消耗；停止添加 TC 后，抑制作用得到逆转。在含有 TC 的 MFC 运行超过 84 天后，阳极生物膜中的 Geobacter 和 Mycobacterium 减少，而 Janthinobacterium 和 Comamonas 增加。在 MFC-Fenton 阴极中，浓度为 10-40mg/L 的 TC 在 8 小时内被去除了 99%以上。O•/HO•和•OH 是阴极 TC 降解的主要原因。最大电流为 0.93mA（在 250Ω 时），通过 MFC-Fenton 反应增加了 36.3%。与缓慢且存在问题的阳极 TC 生物氧化相比，阴极 MFC-Fenton 是一种去除 TC 的高效节能工艺。
