泥沙级配与成分对磷吸附作用影响试验研究  

Experimental study on the effect of sediment gradation and component on phosphorus adsorption

作　　者：尧印鹏 许春阳[1,2] 陈永平 储鏖[2,3] YAO Yin-peng;XU Chun-yang;CHEN Yong-ping;CHU Ao(Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security,Hohai University,Nanjing 210024,China;College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210024,China;Key Laboratory of Port,Waterway&Sedimentation Engineering Ministry of Communications,Nanjing 210029,China)

机构地区：[1]河海大学江苏省海岸海洋资源开发与环境安全重点实验室,江苏南京210024 [2]河海大学港口海岸与近海工程学院,江苏南京210024 [3]港口航道泥沙工程交通行业重点实验室,江苏南京210029

出　　处：《泥沙研究》2023年第6期1-8,共8页Journal of Sediment Research

基　　金：国家自然科学基金项目(51709084,51979076);港口航道泥沙工程交通行业重点实验室开放基金项目(YK222001-6)。

摘　　要：泥沙是水体中磷元素的重要载体,研究泥沙自身特性与磷吸附作用的相关关系对于了解磷在水体中的输运过程具有重要意义。为更加清晰地揭示不同级配和组分对泥沙吸附磷的影响机理,采用江苏沿海现场采集的泥沙进行恒温振荡试验,研究不同中值粒径和黏土含量的泥沙对磷的平衡吸附量和对固体浓度效应的响应。研究结果表明,黏土是泥沙对磷吸附作用的关键,黏土含量高的泥沙对磷具有更强的吸附能力,以黏土含量为变量的公式能更好地表现泥沙对磷的吸附现象。对于粗颗粒和细颗粒泥沙,固体浓度效应均导致单位质量泥沙对磷吸附量下降,在0.5~2.5 g/L的泥沙浓度范围内,两者响应趋势存在差异。Sediment is an important carrier of phosphorus(P)in waters.It is of great importance to investigate the effects of sediment characteristics on P adsorption as it will help understanding the transport process of P in waters.A series of constant temperature oscillation experiments were conducted based on on-site sediment collected from Jiangsu coastal shoals,the equilibrium P adsorption capacities of sediment with different median particle sizes and clay contents,and the solid concentration effects of coarse and fine sediment were studied.The results show that clay content is the key factor on the P adsorption capacity of sediment.Under the same median particle size,sediment with higher clay content has stronger P adsorbability.Therefore,it is more accurate to establish the equation of P adsorption using clay content as the variable instead of the median particle sizes.The solid concentration effect will lead to the decrease of P adsorption capacity with per unit mass of either coarse or fine sediment,although there is a difference in the response trend between the two different sediment particles when the sediment concentration ranges from 0.5 to 2.5 g/L.

关 键 词：泥沙级配 黏土含量 磷 吸附 

分 类 号：TV141.2[水利工程—水力学及河流动力学]