脉冲电解技术处理含铬废水实验研究

Study on Treatment of Chromium-containing Waste Water by Pulse-electrolysis Technique

脉冲电解技术应用于含铬废水处理,以六价铬去除率为考察指标,通过筛选极板材料、电源种类、极板组数强化处理效果,考察了废水pH值、初始浓度、电流强度、电解时间对六价铬去除的影响。实验结果表明,采用铁极板材料和脉冲电源时六价铬去除率明显优于铝极板材料和直流电源;脉冲电源在保证去除速率的情况下能减少能量消耗;增加极板组数可显著强化六价铬去除率,根据反应器确定最大极板组数为9;电源最佳脉冲频率为1 kHz;六价铬去除率随电解时间的延长、电流强度的增加而增大,随废水pH值增大而显著降低;脉冲电解技术更适合低浓度含铬废水的处理;最佳实验条件下六价铬去除率最高可达99.4%。

The electrochemical technique was used to treat chromate waste water by the analysis of removal rate of hexa- valent chrome. In order to strengthen treatment, through screening electrode materials, kinds of power, and the amount of electrode, the influence of pH, initial concentrate of chromate, current intensity, electrolysis time were investigated. The result shows that, the removal of hexavalent chrome was higher when using iron plate electrodes and pulse power than using aluminum plate electrodes and direct current（ DC ） power. Energy consumption could be reduced by the pulse power supply with the same removal rate. The removal rate could be significantly strengthened by the increment of amount of electrodes. According to the electrolysis reactor, the most amount of plate electrodes was 9. The optimum pulse power frequency was 1 kHz. Pulse power technique was more suitable for low concentration of chromium-containing waste water treatment. Under the optimum conditions, the removal rate of hexavalent chrome could be at 99.4%.