三种人工湿地填料的除磷效果研究

The Research on Phosphorus Removal Effect of Three kinds of Constructed Wetland Padding

由沸石、碎石、火山石等3种填料和风车草构建了4个垂直流人工湿地处理单元,在设计水力停留时间2d,间歇进出水的情况下,研究了不同处理单元对污水中磷的去除效果。结果表明:火山石单元对污水中总磷的去除效果最好,碎石单元次之,沸石单元效果最差,栽种有风车草的碎石单元对磷去除效果得到了提高。当进水中总磷的质量浓度分别小于2.5mg/L、3.5mg/L、4.0mg/L时,沸石、碎石、火山石单元的总磷去除率大于47.2%、73.2%、89.8%。当总磷的质量浓度升高至一定程度时,去除率开始显著下降。

Four vertical flow constructed wetland treatment units have been built with three kinds of paddings（zeolite,detritus and lava）and cyperus alternifolius,which aims to study the different treatment units＇ performance in the removal of phosphorus from wastewater.Under the conditions that the designed hydraulic retention time is 2dand water flows in and flows out intermittently,the results of the experiment indicate that the lava unit has the best effect on removing the total phosphorus in the wastewater,which is followed by the detritus unit,while the effect of zeolite unit is the poorest.The detritus unit which is planted with cyperus alternifolius has a better effect on phosphorus removal than that without cyperus alternifolius.When the mass concentration of total phosphorus is less than 2.5mg/L,3.5mg/L,and 4.0mg/L in the inflow water,the corresponding removal rate of zeolite,detritus and lava is more than 47.2%,73.2% and 89.8% respectively.When the mass concentration of the total phosphorus rises to a certain extent,the removal rate begins to decrease obviously.