College of Environmental Science and Engineering, Guilin University of Technology, Guilin, People's Republic of China.
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Areas, Guilin University of Technology, Guilin, People's Republic of China.
Environ Technol. 2024 Jan;45(3):483-494. doi: 10.1080/09593330.2022.2113918. Epub 2022 Aug 25.
Cr(VI) and p-chlorophenol (4-CP) are common pollutants in the aquatic environment but are difficult to degrade and have complex toxic effects. A downflow microbial fuel cell (DLCW-MFC) system was constructed to purify Cr(VI) and 4-CP polluted wastewater, as well as to investigate the effects of different pHs on Cr(VI) and 4-CP removal, electrochemical performance, physiological and biochemical responses, and Cr enrichment status of . . The results showed that the DLCW-MFC had the highest Cr(VI) and 4-CP removal rates at pH 6.5, which were 99.0% and 78.6%, respectively. At the same time, 543 mV output voltage and 72.25 mW/m power density of the system were generated at pH 6.5, which were better than those at pH 7.4 and pH 5.8. The electrochemical performance result showed that pH 6.5 enhanced charge transfer ability and ion diffusion ability of the system. pH 6.5 also promoted growth and photosynthesis, and enhanced the Cr enrichment capacity (4.56 mg/10 plants) of . These results demonstrate that pH 6.5 was the optimum pH for the DLCW-MFC synchronous treatment of Cr(VI) and 4-CP as well as the generation of electricity. The DLCW-MFC designed in this study will provide a reference for purifying polluted wastewater and generating electricity.
六价铬（Cr(VI)）和对氯苯酚（4-CP）是常见的水环境污染污染物，但它们难以降解，且具有复杂的毒性效应。本研究构建了下流式微生物燃料电池（DLCW-MFC）系统，以净化受 Cr(VI)和 4-CP 污染的废水，并研究不同 pH 值对 Cr(VI)和 4-CP 去除、电化学性能、生理生化响应以及 Cr 富集状态的影响。结果表明，在 pH 6.5 时，DLCW-MFC 对 Cr(VI)和 4-CP 的去除率最高，分别为 99.0%和 78.6%。同时，在 pH 6.5 时，该系统产生 543 mV 的输出电压和 72.25 mW/m 的功率密度，优于 pH 7.4 和 pH 5.8 时的性能。电化学性能结果表明，pH 6.5 增强了系统的电荷转移能力和离子扩散能力。此外，pH 6.5 还促进了的生长和光合作用，并增强了 Cr 的富集能力（4.56 mg/10 株）。这些结果表明，pH 6.5 是 DLCW-MFC 同步处理 Cr(VI)和 4-CP 以及发电的最佳 pH 值。本研究设计的 DLCW-MFC 将为净化受污染废水和发电提供参考。
