人工湿地数学模型模拟与应用

Wastewater purification in constructed wetland

人工湿地生态系统具有投资低、出水水质好、抗冲击力强、增加绿地面积和操作简单等优点,在国外得到了较好应用。综述了人工湿地净化技术及湿地模型的研究进展,重点介绍了国外已经成功验证与应用的3种人工湿地模型的开发情况。同时应用某人工湿地的实测数据,通过对模型的验证和率定,表明模型在评估湿地功能和优化设计上的实用性。最后,对人工湿地模拟模型的应用前景及存在问题进行了评述。

A properly designed and operated constructed wetland ecosystem is often the most cost effective wastewater treatment alternative. Removal mechanisms for suspended solids, organic, nitrogen and phosphorus compounds in wastewater are presented. Available wetland models, including SETWET Model of University of Virginia and PREWET Model of US Corp of Engineers, are introduced. The PREWET Model simulation of a 20 km^2 wetland is presented as an example; the predicted removal rates for total suspended solids （26.5 % ） and total phosphorus （3.0% ） are in close agreements with the actual data of 29.5% and 3.0%, respectively. Future wetland models incorporating more interactive factors and/or better software will facilitate simulations for design and evaluation of wetland projects.