干燥好氧颗粒污泥对重金属的吸附研究

Adsorption of heavy metals with dried aerobic granular sludge

采用经干燥处理后失去活性的好氧颗粒污泥对水中的Pb^2＋、Cu^2＋和Cdh进行吸附试验研究。试验结果表明：当溶液pH为5．0，吸附时间为20min，Pbp、Cu^2＋和Cd^2＋的初始质量浓度各为0-40ms／L时，干燥好氧颗粒污泥对3种重金属的吸附效果均最好；吸附过程更加符合Langrnuir等温吸附方程；在单一吸附体系中，吸附剂对3种重金属离子的吸附能力依次为Cd^2＋〉Cu^2＋〉Pb^2＋；在共存吸附体系中，吸附剂对3种重金属离子的吸附能力依次为Pb^2＋〉CubCd^2＋。

Dried and inactive aerobic granular sludge has been used for the adsorption of Pb^2＋, Cu^2＋ and Cd^2＋ in water. The experimental results show that when the pH of solution is 5.0, adsorption time 20 min, and the initial con- centrations of heavy metal ions ,Pb^2＋, Cu^2＋ and Cd^2＋ are 0--40 mg/L,respectively, the dried aerobic granular sludge has the best adsorption effect on the three kinds of heavy metals. The adsorption process is more in accordance with Langmuir isotherm equation. According to single-metal adsorption system, the adsorptive capacity for the three kinds of heavy metals ions follows the order of Cd^2＋〉Cu^2＋〉Pb^2＋. However, in coexisting adsorption system, the adsorption capacity for the three kinds of heavy metal ions follows the order of Pb=＋〉Cu^2＋〉Cd^2＋.