中文摘要：

以合肥董铺水库为水源、天然纯棉绳为人工基质培养自然水体生物膜,研究了该生物膜对Pb^2＋和Zn^2＋的吸附特性及其影响因素。结果表明,单一重金属离子体系中,生物膜对两种重金属离子的吸附均符合Freundlich吸附等温式（RP2b=0.9900,RZ2n=0.9989）和Langmuir吸附等温式（RP2b=0.9823,RZ2n=0.9792）;吸附过程符合Langmuir二级动力学方程（RP2b=0.9992,RZ2n=0.9999）;在pH6-7、温度25-30℃的条件下,Pb^2＋和Zn^2＋有较高的去除率;在Pb^2＋-Zn^2＋两元混合体系中,生物膜对Pb^2＋的吸附选择性明显比Zn^2＋强。

英文摘要：

With high adsorption capability and adsorption surface area, biofilms are actively researched, especially in the area of adsorption of heavy metals. Heavy metal adsorption is greatly affected by the method of developing the biofilm. A biofilm was developed in Dongpu reservoir on the surface of a cotton thread. The characteristics and thermodynamics of Pb and Zn adsorption on the biofilm were studies. Statistical analysis of the adsorption data showed that thermodynamic data for each metal fit the Freundlich（F） and Langmuir（L） isotherms and Langmuir second-order kinetics equation. The optimization condition of removing Pb^2＋ and Zn^2＋ from water were as follows：equlibrium time four hours, pH6-7 and 25 ℃. The capacity of adsorption of Pb^2＋ was greater than that of Zn^2＋ in the mixing system of Pb^2＋ and Zn^2＋.