Eutrophic-water treatment using a hybrid system of stabilization ponds and constructed wetlands

A hybrid system of stabilization ponds and constructed wetlands located in XingYun Lake, China, was used on a eutrophic water system to determine the pollutant removal efficiency. Results indicated that the technology was an effective way of removing nitrate nitrogen, chlorophyll a and algae, with removal efficiencies reaching 95.20%, 98.45%, and 99.87%, respectively. The removal efficiency was evaluated using a first-order model. The model was adequate in predicting pollutant concentration except from May to July 2002, suggesting that the effects of hydrology and vegetation density should be considered for a more accurate prediction.