Wetlands

Project 1

Knotgrass Wetlands

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Project 2

Wetland Model Analysis

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Abstract :

     By analyzing the North American Wetland Treatment System Database (Kadlec and Knight, 1995), this study showed that wetlands could be very important tools in solving the problems for wastewater. In average, these freshwater surface flow wetlands provided about 50 percent removal for BOD5, ammonia nitrogen, total nitrogen and phosphorus, and 68 percent removal for total suspended solids. The study also showed that high hydraulic loading rate would affect the removal efficiency, indicating the importance for the proper operation of wetland systems.

     In this research several wetland models, including regression analysis, areal loading, and the attached-growth type models published in the literature, were examined. The removal rate predicted by these models was compared with the performance data of the North American wetland systems. The result of this research showed none of these models accurately predicted the effluent treatment level for these wetlands in general. These models either were too general and did not consider several important factors, such as temperature, soil and hydraulic conditions, or contained factors that were hard to determine, such as porosity (n) or removal rate constant (KN), resulting in their limited application for general wetland design.

     To generate models that can be used for wetlands effectively, further research in wetland modeling, especially research based on these existing models is necessary.