不同水力负荷下塘-湿地组合处理系统对再生水磷的净化效果

通过研究天津市空港经济区塘湿地组合处理系统对区内污水处理厂MBR出水（再生水）的净化过程，探讨再生水总磷（TP）及活性磷（SRP）的净化效果。研究表明：MBR出水SRP含量较高，SRP/TP高达84%。在3个水力负荷100、150及200 m³/d下，系统对磷均保持良好的处理效果，TP浓度由1.64 mg/L降至0.36 mg/L，SRP浓度由1.30 mg/L降至0.28 mg/L。同时，系统SRP/TP由进水的84%降至出水的54.5%，SRP去除效果显著。再生水中SRP含量较高的问题通过塘湿地组合处理系统得到了良好的解决，从而有效降低再生水回用景观水体所带来的藻华风险。

Removal efficiency of phosphorus using constructed pond-wetland system to purify reclaimed water under different hydraulic loadings

This work investigated the removal efficiency of total phosphorus(TP) and soluble reactive phosphorus(SRP) in a constructed pond-wetland combination system,which was applied to polish the effluent from a membrane bioreactor(MBR) treating the wastewater in Tianjin Airport Industrial Park for the purpose of reclamation.Results indicated that the MBR effluent had a relatively high SRP concentration with a SRP/TP ratio reaching 84%.Under three different hydraulic loadings(i.e.,100,150 and 200 m3/d),the pond-wetland system always exhibited good efficiency on phosphorus removal.The concentrations of TP and SRP were reduced from 1.64 to 0.36 mg/L and 1.30 to 0.28 mg/L,respectively.The corresponding SRP/TP ratio was decreased from 84% to 54.5%,indicating a significant removal of SRP.It is seen that the problem of high SRP concentration in the MBR effluent can be well settled by the pond-wetland system,thus greatly alleviating the potential risk of algal blooms when the reclaimed wastewater is used for landscape water.