碎石、沸石和页岩陶粒构建人工湿地的除磷效果

Phosphorus Removal Effect of Artificial Wetland Built with Detritus; Zeolite and Shale-haydite

由碎石、页岩陶粒、沸石3种基质和芦苇构建4个潜流湿地处理单元,研究不同处理单元对污水中磷的去除效果。在设计水力停留时间3d,连续进出水的情况下,结果表明碎石单元对污水中总磷的去除效果最好,页岩陶粒单元次之,沸石单元效果最差。栽种芦苇碎石单元对磷去除效果优于不栽种芦苇碎石单元。当进水中磷含量较低时,总磷的去除率随质量浓度升高而升高,总磷的质量浓度升高至一定程度时,去除率开始下降。

4 underflow wetland treatment units have been built with 3 kinds of substrates(detritus, shale-haydite and zeolite) and reed for testing the effects of different treatment units on the removal of phosphorus from wastewater. The results show: Under the conditions that the designed hydraulic residence time is 3 d and water flows in and flows out continuously, the detritus unit has the best effect on removing the total phosphorus in the wastewater, which is followed by the shale-haydite unit, while the effect of zeolite unit is the poorest. The detritus unit with reed planted has a better effect on phosphorus removal than the detritus unit without reed planted. When the phosphorus content in the influent water is lower, the removal rate of total phosphorus increases with the increasing of the mass concentration of total phosphorus; however, when the mass concentration of the total phosphorus rises to a certain extent, the removal rate begins to decrease.