泥沙吸附磷前后Zeta电位变化试验

Experiment on Zeta potential variation before and after phosphorus adsorption by sediment

选取长江南京段、淮河蚌埠段以及甬江口3种来源不同的细颗粒泥沙,通过泥沙对磷的等温平衡吸附试验,研究细颗粒泥沙吸附磷前后Zeta电位的变化。结果表明:泥沙的Zeta电位绝对值随着单位质量泥沙对固相磷的平衡吸附量的增大而增大,泥沙稳定性增强,不易絮凝;泥沙的Zeta电位绝对值变化量与单位质量泥沙对固相磷的平衡吸附量呈正比关系,对于不同来源的泥沙,单位质量泥沙对固相磷的平衡吸附量增量相同时,Zeta电位绝对值的增幅不同,甬江泥沙增幅最大,淮河泥沙次之,长江泥沙最小;Zeta电位绝对值相对变化量与固相磷相对吸附量呈正比,甬江泥沙Zeta电位绝对值相对变化量对固相磷相对吸附量变化的敏感度更高,长江与淮河泥沙的敏感度相近。

In this paper,sediment samples of fine partiles were olleted from three rivers,the Nanjing reah of the Yangtze River,the Bengbu reah of the Huai River and the Yong River Estuary.Isothermal equilibrium adsorption experiments were arried out to study the variation of Zeta potential of sediment after phosphorus adsorption.It an be onluded that the absolute value of Zeta potential inreases with the inreasing equilibrium phosphorus adsorption amount per unit mass of sediment,resulting in an enhaning stability that restrains floulation.Zeta potential variation is proportional to the equilibrium phosphorus adsorption amount,but the ratio is different for sediments with different origins.This ratio ranks from high to low respetively for sediments from the Yong River,the Huai River and the Yangtze River.Moreover,the relative variation of Zeta potential is proportional to the relative adsorption amount of phosphorus,and the ratio is the largest for sediment from the Yong River Estuary,followed by that from the Yangtze River and the Huai River,whih have similar values.