含Cu-EDTA废水吸附法处理研究

用活性炭吸附法对Cu-EDTA废水的处理进行了工艺条件研究。结果表明,对含Cu40mg/L的络合剂废水,利用络合铜在酸性条件下的不稳定和活性炭表面电荷作用,在pH=5—6,采用活性炭进行搅拌吸附0.5h,铜的吸附率可达98％,出水残铜稳定在1mg/L以下。同时采用0.5mol/L H_2SO_4洗脱回收铜,且做到活性炭再生使用,铜的回收率为98％。为Cu-EDTA废水的处理提供了一个经济有效的方法。

Activated Carbon Process (or Treatment of Waatewater Containing Cu(II) and EDTA.

I n this paper the treatment of wastewater containing Cu(II) and EDTA with activated carbon adsorption has been examined. The characteristics of unstability of Cu(II) chelate of EDTA in acid medium and the surface charge of activated carbon were utilized in the process. It was found that, after 30 minutes of mixing wastewater containing Cu 40 mg/L and complexing agent EDTA at pH 5-6, 98% of Cu(II) was adsorbed by the activated carbon and remainder Cu(II) concentration in the treated wastewater was less than 1mg/L. Ir was also found that the adsorbed Cu(II) could be eluted from the activated carbon with 0-5 mol H2SO4 solution, and the recovery of Cu was 98% and the spent activated carbon could well be regenerated, The experimental results demonstrated that this treatment process was an economical and effective process.