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
Removal efficiency of phosphorus using constructed pond-wetland system to purify reclaimed water under different hydraulic loadings
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摘要: 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。
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关键词:
- 塘-湿地组合处理系统 /
- 再生水 /
- 磷 /
- 水力负荷
Abstract: 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.-
Key words:
- constructed pond-wetland system /
- reclaimed water /
- phosphorus /
- hydraulic loading
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