矿物材料/PAM吸附-混凝处理含Mn^(2+)酸性矿山废水

Adsorption-Coagulation of Acid Mine Wastewater Containing Mn^(2+) by Environment Mineral Material and PAM

采用环境矿物材料膨润土、钢渣、膨润土-钢渣复合粉末及复合颗粒对含Mn^(2+)酸性矿山废水进行对比处理试验,确定最佳吸附剂及其与聚丙烯酰胺(PAM)联用技术的最佳反应条件。结果表明,5∶5膨润土-钢渣复合粉末对含Mn^(2+)酸性矿山废水处理效果最好;对于p H值为3~3.5、Mn^(2+)质量浓度为50 mg/L的酸性矿山废水,当复合吸附剂用量为3 g/L、PAM投加量为0.4 mg/L、吸附时间为120 min时,Mn^(2+)去除率可达96.12%,处理后溶液pH值为8.91,浊度为4.0 NTU,可达标排放。膨润土-钢渣复合粉末与PAM吸附-混凝联用对含Mn^(2+)酸性矿山废水的处理效果比单独吸附有较大程度提高,可实现泥水分离,且处理成本较低,值得推广应用。

Environmental mineral materials such as bentonite, steel slag, composite power and particle of two materials were prepared to treat acid mine drainage containing Mn^2＋; the optimum adsorption material and best reaction condition were determined. The experimental results showed that 5∶5 bentonite-slag composite powder performed best. For acid mine wastewater with initial p H value 3～3.5 and concentration of 50 mg/L, the removal rate of Mn^2＋ was 96.12% when adsorbent dose was 3 g/L, PAM dose was 0.4 mg/L and adsorption time was 120 min. The wastewater p H value was 8.91 and turbidity was 4.0 NTU which can met discharge standard. The bentonite-slag composite powder combined with PAM had greater effect than sole adsorption process realizing spate separation and reducing the cost. It is worth to extensive application.