Shenyang Academy of Environmental Sciences, Shenyang 110167, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Bioresour Technol. 2017 Oct;241:951-958. doi: 10.1016/j.biortech.2017.06.056. Epub 2017 Jun 13.
Bioelectrodegradation of various organic pollutants has been extensively studied. However, whether different cathode potentials could alter the antimicrobial-degrading biocathode community structure and composition remain poorly understood. Here, the microbial community structure and composition of the nitrofurans nitrofurazone (NFZ) degrading biocathode in response to different cathode potentials (-0.45±0.01, -0.65±0.01 and -0.86±0.05V vs standard hydrogen electrode, with applied cell voltages of 0.2, 0.5 and 0.8V, respectively) were investigated. The bioelectrodegradation efficiency and degree of NFZ were highly related to different cathode potentials. The 0.2 and 0.5V performed biocathode communities were similar but significantly differed from those of the 0.8V and open circuit biofilms. The bacteria possessing functions of nitroaromatics reduction and electrons transfer (e.g. Klebsiella, Enterococcus, Citrobacter and Desulfovibrio) were selectively enriched in different biocathode communities. This study offers new insights into the ecological response of antimicrobial-degrading biocathode communities to different cathode potentials.
各种有机污染物的生物电极降解已得到广泛研究。然而，不同的阴极电势是否会改变抗菌降解生物阴极群落的结构和组成仍知之甚少。本研究中，研究了不同阴极电势（-0.45±0.01、-0.65±0.01 和-0.86±0.05V 相对于标准氢电极，施加的电池电压分别为 0.2、0.5 和 0.8V）对硝基呋喃类抗生素中硝呋扎酮（NFZ）降解生物阴极微生物群落结构和组成的影响。生物电极降解效率和 NFZ 的降解程度与阴极电势密切相关。0.2 和 0.5V 运行的生物阴极群落相似，但与 0.8V 和开路生物膜的群落明显不同。具有硝基芳烃还原和电子传递功能的细菌（如克雷伯氏菌、肠球菌、柠檬酸杆菌和脱硫弧菌）在不同的生物阴极群落中被选择性富集。本研究为了解抗菌降解生物阴极群落对不同阴极电势的生态响应提供了新的见解。
