不同人工湿地基质除磷效率研究

Removal Rate of Phosphorus by Different Constructed Wetland Substrates

[目的]探讨不同人工湿地基质对磷的去除效率。[方法]通过静态试验,选取钢渣、煤渣、炉渣、页岩、土壤、砂石6种基质,研究不同人工湿地基质对磷的去除效率及除磷特性。[结果]6种基质对磷的去除能力表现为钢渣>煤渣>炉渣>页岩>土壤>砂石;当总磷初始浓度为5 mg/L时,6种基质对总磷的去除率分别为99.8%、85.8%、71.2%、63.0%、46.8%、11.7%。页岩和炉渣适合作潜流型人工湿地基质;煤渣适合作为可更换湿地基质,强化除磷效果;钢渣可用于潜流型湿地末端,对尾水TP进行处理。[结论]该研究为今后人工湿地基质的选取提供了理论参考。

[ Objective ] The study aimed to discuss the removal rate of phosphorus by different constructed wetland substrates. [ Method ] Based on a static experiment, we analyzed the removal rate and characteristics of phosphorus by different constructed wetland substrates likesteel slag, cinder slag, shale, boiler slag, soil and gravel. [ Result] The maximum adsorption of phosphorus by various substrates showed as follows ： steel slag 〉 cinder slag 〉 shale 〉 boiler slag 〉 soil 〉 gravel. When the initial concentration of phosphorus was 5 mg/L, the removal rate of the six substrate was 99.76%, 85.8%, 71.2%, 63.0%, 46.8% and 11.7% respectively. Shale and boiler slag can be used as a sub- strate under constructed wetland. Cinder slag could be chosen as a renewable substrate for intensifying phosphorus removal. Steel slag could be used at the end of constructed wetlands to treat TP in outflows. [ Conclusion] The research could provide theoretical references for choosing a suitable substrate for constructed wetlands to remove Dhosohorus in future.