生物电Fenton氧化法去除水体中雌二醇的研究

Removal of 17β-estradiol in a Bio-electro-Fenton System

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p H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(R_(ex)=R_(in)=150?)时,体系中E2去除效果最好,去除率可以达到90%以上。

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 bio- electro-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%.