电催化氧化法处理染料废水的影响因素及动力学

以钛涂膜极板为阳极、石墨极板为阴极、Fe2O3/γ-Al2O3为多相催化剂,构建电-多相催化氧化体系,研究了该体系对酸性大红模拟染料废水中COD的去除效果及其影响因素,优化了实验条件,并初步探讨了COD的降解机理。结果表明,在槽电压20 V,pH 4,曝气量0.24 m3/h,极板间距3 cm的条件下,COD的去除率最高,达到64.5%;COD的降解近似符合一级动力学方程:ln(C0/C)=0.0034t+0.719。在电-多相催化氧化体系中,废水中的有机物被直接矿化或降解为小分子有机物。

Affecting factors and kinetics of dye wastewater treatment by electro-catalytic oxidation process

Under the condition of the coating of titanium plate as anode,graphite plate as cathode and Fe2O3/γ-Al2O3 as heterogeneous catalyst,COD removal effect and its affecting factors in dye-wastewater of acid red by electro-heterogeneous catalytic oxidation system were investigated.Experimental conditions and the degradation mechanism of COD were discussed.The result shows that cell voltage,pH,airflow rate and electrode distance had a significant impact on COD removal.The best COD removal was 64.5% with cell voltage of 20 V,pH of 4,airflow rate of 0.24 m3/h and electrode distance of 3 cm.The degradation of COD approximation order kinetics equation: ln(C0/C)=0.0034t+0.719.It is capable of mineralizing organic contaminants into H2O,CO2 and other inorganics in the electro-heterogeneous catalytic oxidation system.