ZHAI Jun,ZHAI Hao-chong,MA Hong-pu,et al.Mechanism of Phosphorus Removal from Domestic Sewage by Multi-stage Constructed Wetland[J].China Water & Wastewater,2020,36(21):75-79.
多级人工湿地对生活污水中磷素的去除规律
- Title:
- Mechanism of Phosphorus Removal from Domestic Sewage by Multi-stage Constructed Wetland
- 摘要:
- 以生活污水为处理对象，探究总磷、颗粒磷、可溶无机磷和可溶有机磷在多级人工湿地中的去除过程。结果表明，湿地对总磷的去除速率能够稳定达到0.83～0.93 g/(m2·d)，总磷去除速率与污水总磷浓度显著正相关，第一级湿地能够去除57%的总磷。分析湿地进出水中磷的形态发现，湿地对污水中的颗粒磷和可溶无机磷的去除效果较好。污水中的颗粒磷和可溶有机磷主要在第一级湿地中被去除，而污水中的可溶无机磷在第二、三级湿地中被去除。因此，第一级湿地基质可采用廉价的碎石基质，而第二、三级湿地基质可采用对无机磷去除效果更好的基质。
- Abstract:
- The removal of total phosphorus, particulate phosphorus, soluble inorganic phosphorus and soluble organic phosphorus from domestic sewage in a multi-stage constructed wetland was explored. The removal efficiency of total phosphorus per unit area of the wetland could stably reach 0.83-0.93 g/(m2·d), and the total phosphorus removal efficiency per unit area was significantly positively correlated with the total phosphorus concentration in the sewage. In the first stage wetland, 57% of total phosphorus was removed. By analyzing different forms of phosphorus in the influent and effluent of the wetland, it was found that better removal efficiency of particulate phosphorus and soluble inorganic phosphorus was achieved in the wetland. Particulate phosphorus and soluble organic phosphorus in sewage were mainly removed in the first stage wetland, while soluble inorganic phosphorus was removed in the second and third stage wetland. Therefore, cheap gravel could be selected as matrix in the first stage wetland, and matrix with better removal efficiency of inorganic phosphorus could be applied in the second and third stage wetland.
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