The Research On Chengdu Living-water Park Artificial Wetlands And Three Aquatic Plant Species Purification

The water environment has been contaminated seriously with the development of economy and urbanization in China. The water pollution not only destroys the landscape but also do harm to the health of people. At present, to restore the polluted river has been an important task. As one of the new sewage purification technique, the constructed wetland has many merits, such as low investment, low cost, operating easily; excellent effect in treat sewage has been received recognition and applied.Utilizing present trial environment of constructed wetland system for wastewater in Chengdu Living-water Park of Sichuan province, the efficiency of treating the polluted Jinjiang river water with constructed wetlands ecosystem and comparisons of the wastewater treatment efficiency among primary three plant species of Chengdu living-water Park (Phragmites communis Trin, Typha angustifolia and Cyperus alternifolius) were studied in this paper. The results are as follows:1. The purification effect of the constructed wetland is stabilization in the whole year of 2006. The removal rate of CODcr,BODs,TP,TN in the whole constructed wetland System is higher. The ability to adjust pH and DO are significantly increased. The ability to remove pollutants in summer and autumn, especially from June to September, is significantly superior to that in winter, the stage of aquatic plants growth more hearty is better than the stage plant growth more feeblish.2. The ability to remove pollutants of 3 aquatic plant species changes with weather. Sewage removal rate of Typha angustifolia significantly out-performed other plants in May. From August to December, Phragmites communis Trin and Cyperus alternifolius are better than Typha angustifolia L in removing nitrogen and phosphorus. General to say, the wastewater treatment efficiency of Phragmites communis Trin wetland is best and Cyperus alternifolius wetland is secondly; Typha angustifolia is better to remove overmuch phosphorus than other 2 aquatic plant species.3. Study on the function of each environment factors which are cooperated with. These factors' interactions are analyzed by the software of SPSS. The model of each environment factor which related significantly has very important value for estimate.