给水厂铝污泥特性分析及吸附氮磷性能试验  

CHARACTERISTICS OF ALUMINUM-BASED WATER TREATMENT RESIDUAL( WTR)AND ITS ADSORPTION PERFORMANCE ON AMMONIUM AND PHOSPHATE

作　　者：仇付国[1] 孙瑶[1] 陈丽霞[1] 

机构地区：[1]北京建筑大学城市雨水系统与水环境教育部重点实验室,北京100044

出　　处：《环境工程》2016年第4期54-59,共6页Environmental Engineering

基　　金：国家自然科学基金"铝污泥基质填料雨水生物滞留系统中磷的去除机理和形态分布及转化行为研究"(51278024)

摘　　要：对典型给水厂铝污泥的元素组成及含量、比表面积和孔径结构、结构基团等特性进行了系统分析。利用静态试验对其吸附水溶液中氨氮和磷酸盐的性能进行考察,确定了其吸附等温线、吸附速率模型及参数。分析表明:铝污泥中铝、铁、硅等元素含量较多,污泥本身以无定形的非晶体物质为主,具有较大的比表面积和发达的孔隙结构,孔径处于介孔范围,红外光谱分析表明铝污泥中含有大量的铝羟基络合物(Al—OH)和Si—O—Si键。铝污泥对磷和氨氮的吸附等温线可分别用Langmuir和Freundlich等温式描述,吸附动力学符合拟二级动力学模型,铝污泥对氨氮的吸附存在快速吸附后并解吸至稳定的现象。The characteristics of alumium-based drinking water treatment residual（ WTR）,such as their type and chemical composition,surface area and pore structure,function groups,were analyzed. The adsorption capacity of ammonium and phosphate on WTR was tested. The result showed that WTR were highly porous and presented as amorphous phases with greater surface area; the dominant elements found in WTR were Al,Fe,Si and Ca; aluminum hydroxyl complex（ Al—OH）and Si—O—Si bonds were the main function groups on WTR surface. The phosphorus and ammonium adsorption isotherms on WTR could be described respectively by the Langmuir and Freundlich isotherm; the adsorption kinetics complied with the pseudo-second-order kinetic model; the fast adsorbed ammonium on WTR finally became stable after a process of desorption.

关 键 词：铝污泥 磷 氮 吸附等温线 拟二级动力学 

分 类 号：X703[环境科学与工程—环境工程]