Abstract:

Bio-electro-Fenton (BEF) system is an emerging advanced oxidation process, which can not only generate electricity and degrade organic substrates via bio-oxidation on the anode, but also remove bio-refractory pollutants via Fenton’s reaction on the cathode. The bio-electro-Fenton system was applied to the removal of trace estrogens, and both the removal efficiency and the optimization of performance were investigated in the bioelectro-chemical system equipped with the Fe@Fe₂O₃/non-catalyzed carbon felt (NCF) degradation mechanism, including external resistance, the cathode iron content, aeration rate and catholyte pH. It was found that chemical oxidation was the main pathway for E2 removal, and external resistance was the most significant factor influencing E2 removal rate, and the E2 removal was maximized when the external resistance was close to the internal one. The systems with Fe@Fe2O3/NCF cathode showed a high E2 removal performance under the optimized conditions, mostly over 90%.

Key words: words Bio-electron-Fenton, 17β-estradiol, oxidation, external resistance

摘要：

摘要 应用生物电Fenton 系统去除水体中痕量有机微污染物雌激素, 以Fe@Fe₂O₃/NCF (无催化碳毡电极)为
阴极, 研究该系统对雌二醇(E2)的去除效果, 并对该系统外电阻、电极含铁量、曝气量和阴极液 pH 值 4 个
影响因素进行优化。研究表明, 化学氧化是该体系去除E2 的主要途径; 外电阻是影响生物电Fenton 系统去
除E2 的主要因素, 当外阻和内阻相等(Rex = Rin = 150 Ω)时, 体系中E2 去除效果最好, 去除率可以达到90%
以上。

关键词: 生物电Fenton, 雌二醇, 氧化, 外电阻