Zhang Guangyi, Liang Danxin, Zhao Zisheng, Qi Jingsa, Huang Long
Zhengzhou University, Kexue Road 100, Zhengzhou, 450001, China.
Zhengzhou University, Kexue Road 100, Zhengzhou, 450001, China.
Environ Res. 2022 Apr 15;206:112605. doi: 10.1016/j.envres.2021.112605. Epub 2021 Dec 25.
Tetracycline hydrochloride (TCH) is a typical antibiotic pollutant with high toxicity and persistence. The degradation of TCH and the generation of the associated electron mediator in a dual chamber microbial fuel cells (MFCs) were studied. The results of liquid chromatography revealed that TCH could be effectively removed (>93%) in MFCs mode. The maximum COD removal was 88.14 ± 1.47% in MFCs while it was 69.57 ± 1.36% in open circuit MFCs. According to cyclic voltammetry, the presence of the relevant redox peaks clearly suggested that the intermediates from TCH degradation could act as endogenous electron mediator. The highest power density of 120.02 ± 2.76 mW/m and the lowest internal resistance of 18.68 Ω were achieved in MFC with 2 mg/L of TCH. Microbial community analysis illustrated that Bacteroides, Comamonas, Clostridium_sensu_stricto, Desulfovibrio and Geobacter were enriched and played a dominant role in TCH degradation and power generation. Electrochemical active bacteria had certain tolerance to TCH and the inhibiting threshold value of TCH was below 5 mg/L. This study provided a new thinking that low concentration of TCH could produce electron mediators to improve the performance of MFC system.
盐酸四环素（TCH）是一种典型的具有高毒性和持久性的抗生素污染物。研究了双室微生物燃料电池（MFCs）中TCH的降解及相关电子介质的产生。液相色谱结果表明，在MFCs模式下TCH可被有效去除（>93%）。MFCs中最大化学需氧量（COD）去除率为88.14±1.47%，而开路MFCs中为69.57±1.36%。根据循环伏安法，相关氧化还原峰的存在清楚地表明，TCH降解产生的中间产物可作为内源性电子介质。在含有2mg/L TCH的MFC中，实现了120.02±2.76mW/m的最高功率密度和18.68Ω的最低内阻。微生物群落分析表明，拟杆菌属、丛毛单胞菌属、严格梭菌属、脱硫弧菌属和地杆菌属得到富集，并在TCH降解和发电中起主导作用。电化学活性细菌对TCH有一定耐受性，TCH的抑制阈值低于5mg/L。本研究提供了一种新的思路，即低浓度的TCH可产生电子介质以提高MFC系统的性能。
