水体扰动条件下黄河泥沙对磷的吸附效应

Adsorption influence of the Yellow River sediment on phosphorus under water disturbance condition

采用黄河花园口断面河滩原型沙开展实验研究,重点研究了含调水调沙期的丰水期较高含沙量时黄河泥沙对磷的吸附效应及吸附动力学特性,建立了吸附动力学模型,为黄河下游河道和滩区生态综合治理提供借鉴。研究表明:含沙量越高,黄河泥沙对磷的吸附越快,吸附平衡时间越短。总磷的去除率在17.7%~60%范围的含沙量较低时,泥沙对总磷的吸附作用不明显,总磷去除率随含沙量的增加呈对数增长。单位质量泥沙的吸附量随含沙量增加呈对数递减。黄河泥沙对磷的吸附过程以物理吸附为主,同时也存在一定的化学吸附。

The prototype sand on the beach at the Huayuankou Reach of the Yellow River was used in this study. The adsorption influence and adsorption kinetics of the Yellow River sediment on phosphorus were studied in the wet season with high sediment content, and the adsorption kinetics was established. The dynamic model provides a reference for the comprehensive ecological management of the channels in the Lower Yellow River and floodplains. Results show that the higher the sediment content, the faster the adsorption of phosphorus by the Yellow River sediment, and the shorter the adsorption equilibrium time. The removal rate of total phosphorus was between 17.7% and 60%. The adsorption influence is not obvious, and the total phosphorus removal rate increases logarithmically with the increase of sediment content. The adsorption capacity per unit mass of sediment decreases logarithmically with the increase of sediment content. The adsorption processes of phosphorus on the Yellow River Salt are mainly physical adsorption, and at the same time, there are certain chemical adsorption.