摘要：

采用间歇式电絮凝装置，以铁铝为复合电极，考察氯化物浓度、电流密度、极板间距以及pH对电絮凝去除地下水中砷、锰、氟三类污染物效果的影响。结果表明，氯化物浓度变化对锰和砷的去除几乎没影响，但浓度过高会阻碍电絮凝除氟过程的进行；反应初期随pH和电流密度增加，目标污染物去除率增大，随极板间距增大，目标污染物去除率减小，反应后期恰恰相反；在最佳运行条件下，即电流密度3 mA/cm²，电解时间25 min，极板间距2.0 cm，初始pH 6.0条件下，砷、锰、氟的去除率分别为99.75%、100.00%、69.84%。

关键词: 电絮凝, 砷, 锰, 氟, 地下水污染

Abstract:

An intermittent electro-flocculation device with iron and aluminum as the composite electrode was used to investigate the effects of chloride concentration, current density, electrode spacing, and pH on the removal effect of arsenic, manganese and fluorine from groundwater by eletro-flocculation. The results showed that the change of chloride concentration had little effect on the removal of manganese and arsenic but the high chloride concentration would hinder the process of electro flocculation for defluoridation. The removal efficiency of target pollutants at the initial stage of the reaction increased with the increase of pH and current density, while decreased with the increase of the electrode spacing. However, in the latter stage of the reaction, it presented opposite trend. Under the optimal operating conditions with current density 3 mA/cm², electrolysis time 25 min, plate spacing 2.0 cm and initial pH 6.0, the removal rates of arsenic, manganese and fluorine were 99.75%, 100.00% and 69.84% respectively.

Key words: electro-flocculation, arsenic, manganese, fluorine, groundwater pollution

中图分类号: 

• X523