模拟沸石垂直潜流人工湿地除磷性能试验

Phosphorus removal performance of vertical subsurface flow constructed wetland with zeolite as substrate material

为确定沸石作为人工湿地基质的可行性,就沸石静态吸附和模拟沸石人工湿地去除生活污水中的总磷进行了试验。结果表明,温度降低时TP最大理论吸附量上升11.63%;最大TP解析量占最大吸附量的2.31%;本试验条件下,模拟沸石人工湿地对生活污水中TP的平均去除率为34.12%。就TP的去除而言,沸石不适合单独作为人工湿地基质,若采用应注意因TP解析而形成的二次污染。

In order to confirm the feasibility of using zeolite as substrate material of constructed wetland, a test that removing total phosphorus from domestic wastewater by zeolite static adsorption and constructed wetland with zeolite as substrate material was carried out. The results showed that, with temperature decreasing, the maximal theoretical TP adsorption capacity increased 11.63%, the maximal TP desorption capacity accounted for 2.31% of the maximal adsorption capacity; under the test condition, the average removal rate of TP from domestic wastewater by constructed wetland with zeolite as substrate material was 34.12%. As the TP removal efficiency is not so good, zeolite is not suitable to be used as substrate of constructed wetland individually, and attention must be paid to control the risk of secondary pollution caused by TP desorption.