海水
阳极
化学
阴极
降级(电信)
硫黄
微生物燃料电池
阴极保护
碳纤维
人工海水
基质(水族馆)
生物膜
环境化学
电极
核化学
细菌
材料科学
有机化学
生物
生态学
电信
遗传学
物理化学
复合数
计算机科学
复合材料
作者
Haoming Xin,Xindi Chen,Yin Ye,Ying‐Chih Liao,Haiping Luo,Chuyang Y. Tang,Guangli Liu
标识
DOI:10.1016/j.watres.2024.121212
摘要
The aim of this study was to investigate the removal of metronidazole (MNZ) from seawater using a bioelectrochemical system (BES). Single-chamber BES (i.e., S-BES) and dual-chamber BES (i.e., D-BES) were constructed with carbon brush as the anode and cathode. With the inoculum of sea mud and 2 g/L of glucose as the substrate in seawater, S-BES and D-BES were acclimated to test the MNZ removal. Results showed that S-BES could remove almost 100 % of 200 mg/L MNZ within 120 h and remain stable within 10 cycles of operation (∼50 d) under the applied voltage of 0.8 V. The MNZ removal reached ∼100 % and 60.2 % in the cathodic and anodic chambers of D-BES fed by 100 mg/L MNZ under 0.8 V, respectively. The MNZ concentration of 200 mg/L significantly inhibited the sulfur metabolism, decreased the ratio of live to dead cells in the electrode biofilms, and thus reduced the SO42− removal in the S-BES. The MNZ degradation and S2– oxidation was mainly attributed to the cathodic and anodic biofilms of S-BES, respectively. Three degradation pathways of MNZ were proposed based on the identified intermediates and results of density functional theory calculations. The synergies among different genus species in the bacterial communities of biofilms, and between anodic and cathodic reactions could be responsible for the high performance of S-BES. Results from this study should be not only useful for the MNZ removal but also for effective MNZ inhibition of sulfate-reducing bacteria induced microbiologically influenced corrosion in seawater.
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