三价铬钝化废水中水回用研究

Reuse of Trivalent Chromium Passivation Wastewater Research

文章以三价铬钝化废水处理为研究对象,与常规的水处理方法作对比试验,为彻底去除钝化废水中三价铬络合物,实现铬钝化废水中水回用到生产上,并尽可能提高回用率,复合采取化学沉淀、膜分离法、三维电极氧化耦合高压脉冲电絮凝等处理方法设计了钝化废水深度处理及中水回用系统,试验结果表明:上述三价铬钝化废水处理及中水回用系统能满足回用水水质要求。在废水总铬浓度低于8000 mg/L的前提下,上述钝化废水处理及中水回用系统能保持自身良性循环,综合回用率达90%左右,不向环境外排废水。

In the paper, as the object of study, the trivalent chromium passivation wastewater treatment will be compared with conventional methods for water treatment. For the complete removal of trivalent chromium passivation wastewater coordination compound, the recycling of chromium passivation wastewater in the production, and a higher rate of reuse, it is suggested to apply chemical precipitation method, membrane separation method, three-dimensional electrode with oxidative coupling process on high-voltage pulse electric flocculation treatment to design the passivation wastewater advanced treatment and water reuse system. The test results show that the trivalent chromium passivation wastewater treatment and water reuse system can meet the requirements of water quality. On the premise that the chromium concentration is below 8000 mg/L, the system can keep its substantial circulation with the passivation wastcwater treatment and reclaimed water, with the overall recycling rate around 90 % without disposing waste water externally.