Water Purification by Hydrophytes and Change of Microorganism in Root Zone and Water
Three kinds of hydrophytes commonly used in constructed wetlands are cultivated in the lab to purify contaminated lake water,i.e.,Sagittaria sagittifolia,Pistia straiote and Myriophyllum spicatum. The study concentrated on their capabilities in removing total nitrogen and total phosphorus,and the efficiencies investigated showed Pistia straiote was the best in both TP and TN removals, with 96.0% and 99.73% respectively. Also studied were the bacteria number both in root zone and water,the speciation of nitrogen and the concentration of TP during different stages. It is revealed that bacteria total number in water indicated the level of water pollution.