摘要：

针对村镇生活污水，开展水力负荷对潜流与复合垂直流人工湿地脱氮效果影响的研究，结果表明：两种人工湿地对村镇生活污水均有较好的处理效果；随水力负荷升高，两种人工湿地除碳、脱氮率不同程度降低。潜流人工湿地除碳效果优于复合垂直流人工湿地，复合垂直流人工湿地脱氮效果更佳；水力负荷≤0.25 m³/（m²·d），两种人工湿地对COD去除率均大于90%，复合垂直流人工湿地对NH₃-N、TN去除率保持在60%以上，出水水质优于一级A标准。动力学研究表明一级动力学模型能较好拟合两种人工湿地的COD、NH₃-N、TN去除规律。

关键词: 潜流人工湿地, 复合垂直流人工湿地, 水力负荷, 脱氮

Abstract:

Aiming at rural domestic sewage, the effects of hydraulic loading on the nitrification efficacy of the subsurface-flow and composite vertical-flow constructed wetlands have been studied. The results show that both kinds of constructed wetlands have pretty good treatment efficacy. Along with the increase of hydraulic loading, the removing rates of carbon and nitrogen in the two kinds of constructed wetlands decrease to a certain degree. The carbon removing efficacy of subsurface flow constructed wetland is better than that of composite vertical-flow constructed wetland. The nitrogen removing efficacy of composite vertical-flow constructed wetland is even better. When hydraulic loading is ≤0.25 m³/(m²·d), the COD removing rates of the two kinds of constructed wetlands are higher than 90%. The NH₃-N and TN removing rates of composite vertical-flow constructed wetland is higher than 60%. Its effluent water quality is superior to the First Grade A Standard. Dynamics study proves that the first order kinetics model can well fit the removing law of COD, NH₃-N, TN from rural domestic sewage by both kinds of constructed wetlands.

Key words: subsurface-flow constructed wetlands, composite vertical-flow constructed wetlands, hydraulic loading, nitrogen removal

中图分类号: 

• X703.1