膨润土-白泥复合吸附剂处理含Zn^(2+)酸性废水实验研究

Experimental study on bentonite-white mud composite adsorbent for treatment of acid wastewater containing Zn^(2+)

为高效处理含重金属Zn^(2+)的酸性矿山废水(AMD),将具有碱性的造纸白泥和具有黏结性和吸附性的膨润土复合,并掺加造孔剂,通过高温焙烧制备新型复合颗粒吸附剂,建立Zn^(2+)的吸附等温式和动力学方程.研究结果表明:复合吸附剂最大碱度释放量为82.9 mg/g(以Ca_(2)CO_(3)计),投加复合吸附剂可使水样的pH值上升.Freundlich等温模型能更好地描述复合吸附剂对Zn^(2+)的吸附,吸附过程更符合准二级动力学方程.

In order to efficiently treat acid mine drainage(AMD)containing heavy metal Zn^(2+),a new type of composite particle adsorbent was prepared by compounding alkaline papermaking white mud and cohesive and absorbent bentonite and adding a pore former to high-temperature roasting,and the adsorption isotherms and kinetic equations for Zn^(2+)were established.The results showed that the maximum alkalinity release of composite adsorbents was 82.9 mg/g(calculated as Ca_(2)CO_(3)),adding composite adsorbent can increase the pH of water sample.The Freundlich isotherm model could better describe the adsorption of Zn^(2+)by composite particles,and the adsorption process was more in line with quasi-second order kinetics equation.