潜流湿地和表面流湿地的净化效果与植物生长比较

分别以砾石和土壤为填料构建成潜流人工湿地和表面流人工湿地,处以较大水力负荷的污水处理。比较了两种湿地对污水的净化效果,结果表明在较大水力负荷条件下两种湿地的净化效果都较差,但潜流湿地对各种污染物的净化能力都优于表面流湿地;土柱法测量了湿地植物的根系生物量,结果显示湿地植物地上部分长势差异不明显,但潜流湿地的根系生物量显著低于表面流湿地的根系生物量(P<0.05)。结合前期实验结果得出湿地净化效果不仅与湿地植物根系生物量有相关关系,还与其他因素有一定的相关关系。

Study on removal rate of pollutants and plant growth in subsurface and surface flow constructed wetlands.

A pilot experiment was conducted to compare the removal rate of pollutants,plant growth and biomass of species in gravel-bed subsurface flow constructed wetland and soil-bed surface flow constructed wetland treated with larger water load.The results showed that the wastewater purification effect in subsurface flow constructed wetland was superior to that in surface flow constructed wetland with the same retention time.Root biomass in surface flow constructed wetland was significantly higher than that in subsurface flow constructed wetland,while the shoot growth in surface flow constructed wetland was nearly equal to that in subsurface flow constructed wetland.The results suggested that there wasn't correlative relaxation between purification effect and root biomass.