2种人工湿地污水净化效果及其耐污染负荷冲击能力研究

Studies on the Purification Effects and Shock Loading Resistibility of Two Types of Constructed Wetlands

依托建立在新沂河河漫滩的人工湿地中试工程开展现场试验，研究分析2种人工湿地对污染河水的净化效果及耐污染负荷冲击能力。结果表明：在相同的进水浓度条件下，垂直流人工湿地对CODMn的净化效果明显优于潜流，平均去除率高出13．7％，而两者对NH4^＋-N的净化效果没有明显差异，且都保持较高水平，平均去除率均高于80％；潜流和垂直流人工湿地自身构造不同引起的水流运行方式及截留、过滤作用的差异对有机污染物的去除影响较大，而对NH4^＋-N的净化效果影响较小；进水污染负荷变化对人工湿地污染物去除效率影响显著，垂直流人工湿地耐CODMn污染负荷冲击能力明显强于潜流，而对NH4^＋-N污染负荷变化，两者都表现出了较强的耐受能力，差异不明显。

Based on a pilot-scale experiment of constructed wetlands at the flood plain of Xinyi River, their purification effects and shock loading resistibility were studied. Results showed that under the same influent strength, the purification effect in terms of reduction in permanganate value for vertical flow constructed wetland （VFW） was obviously superior to that for subsurface flow constructed wetland （SSFW） with 13.7% higher of the average reduction. There was no distinct difference between those two types of constructed wetlands in the purification effects in terms of ammonium-nitrogen （NH4^＋-N） removal being both at higher than 80%. The difference of water flowing pattern, interception and filtration caused by the different wetland structures had notable effects on the organic pollutant removal, but a minor influence on NH4^＋-N removal. As varying influent Ioadings could bring significant influence on the pollutant removal efficiencies, the resistibility to permanganate value shock Ioadings for VFW was stronger than that for SSFW, whereas the resistibility to fluctuating NH4^＋-N Ioadings for both wetlands showed rather strong without apparent difference each other.