镉存在条件下湖泊表层沉积物对菲的吸附  

Adsorption of Phenanthrene by Surface Sediments of Lake under the Condition of Cadmium Presence

作　　者：李兴国 张克峰[1] 刘雷[1] 闫帅成 LI Xingguo;ZHANG Kefeng;LIU Lei;YAN Shuaicheng(Municipal and Environmental Engineering College of Shandong Jianzhu University,Jinan 250101,China;Jinan Municipal Engineering Design and Research Institute,Jinan 250101,China)

机构地区：[1]山东建筑大学市政与环境工程学院,山东济南250101 [2]济南市市政工程设计研究院,山东济南250101

出　　处：《净水技术》2020年第10期155-161,共7页Water Purification Technology

基　　金：山东省高等学校科技计划(J13LC01)。

摘　　要：自然资源丰富的南四湖是华北地区第一大淡水湖泊,也是南水北调东线工程的重要枢纽。试验以南四湖表层沉积物为湖泊表层沉积物的代表,以菲为多环芳烃类有机物的代表,研究复合污染体系下重金属镉、温度、pH等因素对湖泊表层沉积物吸附有机物菲的影响。结果表明:水体中镉的存在小幅度提高了湖泊表层沉积物对菲的吸附量。拟一级和拟二级动力学方程能很好地拟合表层沉积物对菲的吸附,等温状态下湖泊表层沉积物对菲的吸附可用Freundlich方程拟合,表明湖泊表层沉积物对菲的吸附既有物理扩散吸附又有化学吸附。湖泊表层沉积物对菲的吸附达到动态平衡的时间是24 h,前3 h以湖泊表层沉积物对菲的物理吸附为主,3 h后以沉积物对菲的化学吸附为主。湖泊表层沉积物对菲的吸附比例随环境pH的升高而降低,当pH值=10时,表层沉积物对菲的吸附比例仍高于80%。Nansi Lake,which is rich in natural resources,is the largest freshwater lake in North China,and also an important hub for the Eastern Route of South-North Water Diversion Project.The test took surface sediments of Nansi Lake as the representative surface sediments of lake,and phenanthrene as the representative of polycyclic aromatic hydrocarbons organic compounds.The effects of cadmium,temperature,pH value and other factors on the adsorption of phenanthrene by surface pollutants in lakes under the combined pollution system were studied.Results showed that the presence of cadmium in water increased the adsorption of phenanthrene by surface sediments of the lake to a small extent.The quasi-first-order and quasi-second-order kinetic equations could well fit the adsorption of phenanthrene on surface sediments,and the adsorption of phenanthrene on surface sediments of lakes under isothermal conditions could be fitted with Freundlich equation,which showed that the adsorption of phenanthrene on surface sediments of the lake had both physical diffusion adsorption and chemical adsorption.The time it took for surface sediments of the lake to adsorb phenanthrene to reach dynamic equilibrium was 24 h,physical adsorption of phenanthrene on surface sediments of the lake was dominant in the first 3 h,and chemical adsorption of phenanthrene by sediments was the main after 3 h.The adsorption ratio of phenanthrene in surface sediments of lakes decreased with the increase of environmental pH value,when pH value was 10,adsorption ratio of phenanthrene in surface sediments was still higher than 80%.

关 键 词：表层沉积物 菲 镉 复合污染 吸附 

分 类 号：X52[环境科学与工程—环境工程]