粉煤灰合成沸石用于含Cr^3＋废水处理的应用研究

研究了粉煤灰合成沸石处理含Cr^3＋废水的性能以及其它几种竞争性阳离子的影响。合成沸石对低浓度（〈100 mg/L）含Cr^3＋废水具有良好的去除效果,去除效率达94%以上。当废水中存在其它阳离子（NH＋4、Na＋、K＋、Ni^2＋和Ca^2＋）时,即使其阳离子浓度（以me/L计）达Cr3＋的4倍,合成沸石对Cr^3＋仍表现出了较高的选择性,Cr^3＋去除效率基本未受影响。对于成分复杂的实际含Cr^3＋的制革废水,当合成沸石投加量大于5 g/L时,对Cr^3＋去除率高达99%以上,处理后废水中的Cr^3＋浓度低于国家规定Cr^3＋排放限值。因此,粉煤灰合成沸石在处理含Cr^3＋废水方面具有良好的应用前景。

Application of Zeolite Synthesized from Coal Fly Ash to the Treatment of Cr3+-Containing Wastewater

The treatment of Cr^3＋-containing wastewater by zeolites synthesized from coal fly ashes （ZFAs） and the influence of competitive cations were investigated. ZFAs exhibited high performances for the uptake of Cr^3＋ with low concentrations （〈100 mg/L）. The removal efficiency exceeded 94 %. In the presence of NH： ,Na^2＋ ,K^ ,Ni^2＋ and Ca^2＋ whose normal concentration were equivalent to 100 %, 200 %, and 400 % of Cr^3＋, ZFAs showed very high selectivity for Cr^3＋ Still, and the removal efficiency of Cr^3＋ was not altered by the competitive cations. Despite the complex composition of a real tannery wastewater, the removal rate of Cr^3＋ by ZFAs reached over 99 % when the dosage of ZFAs is more than 5 g/L with the result that the concentration of Cr^3＋ in treated wastewater was lower than the regulated discharge limit. It is concluded that ZFAs may be promising materials for the treatment of Cr^3＋ containing wastewater.