Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732The complicated floating-bed technique is an effective method for the non-point sources(NPS) pollution control. Suitable aquatic plants are selected and used to build the complicated floating-beds. They were applied for controlling NPS pollution in the pre-reservoir project in Lake Tai basin of China.
Colocasia esculenta(Linn.) Schott, Sagittaria sagittifolia Linn, Eleocharis dulcis Trin.ex Henschel,Oenantha javanica(Blume)DC, Ipomoea aquatica Forst, and Ganna generalis Balier are the common aquatic vegetable, ornamental flower in the area of Taihu lake. The removal rate of nitrogen and phosphorus by those plants at light eutrophicated level in summer and autumn was studied. They were selected as floating-bed plants for pre- reservoir project.
This paper proves that the Ipomoea aquatica Forst has better removal effect on total phosphorous (TP)(30-81%) and Colocasia esculenta(Linn.) Schott on total nitrogen (TN)(62-67%).
The floating-bed was applied in the pre-reservoir non-point pollution control project in the plain river network at Yixing County in Lake Tai basin. The effect of purification was very obvious. The complicated floating-bed was more effective than the previous plane floating-bed in the removal of TN and TP. This study can provide the useful information in the non-point sources pollution control and the ecological rehabilitation of rivers and lakes in genera