水力负荷对湖滨带人工湿地除磷效果的影响

Influence of Hydraulic Load on Phosphorus Removal by Lake-side Constructed Wetlands

分析了湖滨带复合人工湿地的各单元在旱季和雨季的除磷效果。结果表明,在进水TP浓度较高时,沉淀池对TP的去除效果较明显,旱、雨季的不同水力负荷对处理效果几乎没有影响。雨季时潜流人工湿地内发生了不溶性磷的吸附和沉积,实现了对磷的去除;旱季时由于水力负荷极小,水体流动性差,系统内处于厌氧状态,出现了磷的释放。雨季时,表面流人工湿地对磷的去除效果没有沉淀池和潜流人工湿地的理想,旱季的低水力负荷对除磷效果没有显著的影响。

The phosphorus removal efficiency by lake-side constructed wetlands during dry and wet seasons was analyzed. The results show that the effect of sedimentation on total phosphorus removal is apparent at high influent concentrations, and the different hydraulic loads during dry and wet seasons have no influence on the treatment effect. In the subsurface flow constructed wetland, insoluble phosphorus is removed by adsorption and deposition during wet season. During dry season with low hydraulic load, the system is at an anaerobic condition due to insufficient water mobility, and phosphorus release from the media occurs. During wet season, the phosphorus removal efficiency by the surface flow constructed wetland is poorer than that by sedimentation and subsurface flow constructed wetland. The low hydraulic load during dry season has no evident influence on phosphorus removal efficiency.