周期换向电絮凝法用于处理含铬废水研究

以铁作为极板,采用周期换向电絮凝法处理含铬废水,考察了初始pH值,电流密度,处理时间,初始质量浓度及周期换向时间等因素的影响.结果表明,在初始pH值为8.0~9.0,电流密度为16.37A/m2,处理时间为3.0min,初始浓度为40mg/l时,总铬和六价铬的去除效果理想,去除率均在99.5%以上;10~15min的换向周期在一定程度上解决了极板钝化问题,可降低10%~20%的能耗.实验结果表明周期换向电絮凝法处理含铬废水效果好,且可降低能耗.

Treatment of wastewater containing chromium with periodic reversal electrocoagulation

Wastewater containing chromium was treated with periodic reversal electrocoagulation by using iron plate as electrode. Several affecting factors for the removal of chromium, such as initial concentration, pH, retention time, reversal period and current density were investigated. The results showed that the removal rates of total Chromium and Chromium (VI) were above 99.5% under initial concentration of 40 mg/L, pH of 8.0~9.0, retention time of 2min and current density of 16.37A/m2. Furthermore, the electrode passivation was reduced with the reversal period of 10~15min, and the energy consumption decreased by 10%~20%. The experiment results indicated that periodic reversal electrocoagulation was effectively and energy-saving for treatment of wastewater containing chromium.