邯郸膨润土吸附含镍废水的实验研究

Removal of Ni^(2+) from containing wastewater by bentonite of Handan

研究了邯郸钙基膨润土及其钠化改性土对模拟废水中Ni2+的吸附行为,探索了膨润土用量、吸附时间、pH值、初始离子浓度和温度等因素对Ni2+吸附效果的影响。结果表明,实验所用两种膨润土对Ni2+的吸附在15min时基本达到吸附平衡,吸附率随溶液pH值的增大、吸附剂用量的增加、搅拌时间的延长而增大;钠化土的吸附效果明显优于钙基土,Ni2+的去除率可达96%以上;经钠化土处理后废水中的Ni2+浓度为0.825mg/L,低于国家排放标准1mg/L。

The removal of Ni^2＋ cations from artificial wastewater by Ca-bentonite and Na-bentonite of Han- dan was studied. The effect of adsorption conditions on the adsorption behavior of bentonite was investigated, such as the amount of bentonite, adsorption time, pH value, initial concentration and temperature. The results showed that the equilibrium time of adsorbing Ni^2＋ cations were 15min. The removal rate of Ni^2＋ cations increased with the increase of pH, amount of bentonite and time of adsorption. Na-bentonite sorbed more Ni^2＋ than Ca-bentonite, the removal rate of Ni^2＋ reached up to 96%. The concentration of wastewater treated by Na-bentonite was 0. 825mg/L, which is lower than the national emission standards.