Wang XiaXia, Zhao Yu, Jin Li'E, Liu Bin
Institute of Clean Chemical Engineering, College of Chemistry and Chemical Engineering, Taiyuan University of Technology Taiyuan 030024 China
RSC Adv. 2024 Feb 12;14(8):5390-5399. doi: 10.1039/d3ra07771c. eCollection 2024 Feb 7.
This study explores the removal of Cd(ii) from wastewater using a microbial electrolysis cell (MEC) to investigate the electrochemical performance and removal kinetics of an anodic polarity reversal biocathode and the mechanism of action of electrochemically active bacteria. Comparative electrochemical methods showed that using an anodic polarity reversal biocathode resulted in greater than 90% removal of different concentrations of Cd(ii) within three days, which may be related to the catalytic effect of anodic electrochemically active bacteria. However, due to the ability of bacteria to regulate, up to nearly 2 mg L of Cd(ii) ions will remain in solution. As shown by the linear fitting relationship between scanning speed and peak current, the removal process was dominated by adsorption control for 20-80 mg L Cd(ii) and diffusion control for 100 mg L Cd(ii). The analysis of raw sludge and sludge containing Cd(ii) showed that and were the primary cadmium-tolerant bacteria, and that the ability to remove Cd(ii) was the result of a synergistic collaboration between autotrophic and heterotrophic Gram-negative bacteria.
本研究利用微生物电解池（MEC）探索从废水中去除镉（II），以研究阳极极性反转生物阴极的电化学性能和去除动力学以及电化学活性细菌的作用机制。比较电化学方法表明，使用阳极极性反转生物阴极可在三天内使不同浓度的镉（II）去除率超过90%，这可能与阳极电化学活性细菌的催化作用有关。然而，由于细菌的调节能力，溶液中仍会残留高达近2 mg/L的镉（II）离子。扫描速度与峰值电流之间的线性拟合关系表明，对于20 - 80 mg/L的镉（II），去除过程以吸附控制为主，而对于100 mg/L的镉（II），则以扩散控制为主。对原污泥和含镉（II）污泥的分析表明，[具体细菌名称未给出]是主要的耐镉细菌，并且去除镉（II）的能力是自养和异养革兰氏阴性细菌协同作用的结果。
