悬移质泥沙粒径对磷吸附的影响  

Effect of Different Size of Suspended Sediment on Adsorption of Phosphorus

作　　者：秦宇[1] 王紫薇[1] 韩超[1] 

机构地区：[1]重庆交通大学水利水运工程教育部重点实验室,重庆400074

出　　处：《中国给水排水》2017年第7期80-83,共4页China Water & Wastewater

基　　金：水利水运工程教育部重点实验室开放基金资助项目(SLK2012A03);重庆市教委项目(KJ1500506)

摘　　要：河流中泥沙运动对于磷的分布有着重要影响。针对粉粒粘粒混合物(≤0.038mm)、粉粒(0.038~0.075 mm)、极细沙(0.075~0.15 mm)、细沙(0.15~0.25 mm)四种泥沙粒径等级,运用循环流明渠模型,研究泥沙粒径变化对磷吸附过程的影响。试验结果显示,四种不同粒径泥沙均在3 h内完成吸附平衡,吸附平衡时单位质量泥沙饱和吸附量分别是:细沙为0.1 mg/g、极细沙为0.05 mg/g、粉粒为0.09 mg/g、粉粒粘粒混合物为0.13 mg/g,粉粒粘粒混合物的吸附速率最快,其最大吸附速率达到0.6 mg/(g·h)。除细沙外,其他三种粒径呈现粒级越小则吸附能力越强的规律。细沙由于内部孔隙较大,存在孔隙填充吸附,吸附特性与粉粒类似。The sediment movement in river has important effect on the distribution of phosphorus. Aimed at four kinds of sediment grain sizes including mixture of silt and clay with less than or equal to 0. 038 mm, silt with 0.038 to 0. 075 mm, very fine sand with 0. 075 to 0.15 mm and fine sand with 0.15 to 0.25 mm, the influence of variation in sediment grain sizes on phosphorus adsorption process was investigated using the circular open channel model. The results showed that four kinds of sediment grain sizes could all achieve the adsorption equilibrium within 3 hours. The saturated adsorption capacity per unit mass of sediment during the adsorption equilibrium was as follows： fine sand was 0.1 mg/g, very fine sand was 0.05 mg/g, silt was 0.09 mg/g and mixture of silt and clay was 0.13 mg/g. The mixture of silt and clay had the fastest adsorption rate with the maximum adsorption rate of 0.6 mg/（ g · h）. The smaller the sediment grain size, the higher the adsorption capacity of three kinds of sediment grain sizes could be except for fine sand. Because of the large internal pore, fine sand had pore filling adsorption, and its adsorption property

关 键 词：悬移质泥沙 粒径 磷 吸附 

分 类 号：TV142[水利工程—水力学及河流动力学] X143[环境科学与工程—环境科学]