The Study On Subsurface Flow Constructed Wetland Treating Eutrophic Aquaculture Water In Village Of Chongming Island

The eutrophication of aquaculture water leads to deteriorate water body and pollute the water system etc, which is also becoming a limiting factor of the construction of ecological village of Qianwei and ecological island of Chongming. Constructed Wetlands (CW) has many advantages, such as high treatment efficiency, low cost of construction, operation and maintenance, wide field of application and strong ability of shock loading resistance etc, which meets the requirement of treating the eutrophic aquaculture water in village in order to achieve the good circulation of water resource.Supported by the project "Water resource maintenance and the technology and demonstration of water ecological restoration in Chongming Island" (No. 05dz 12009) of SAST, the study will support to promote the construction of the Chongming Ecological Island by using the pilot unit of CW treating the local entrophic aquaculture water in village of Chongming Island, which is mainly on the basic study of CW and removal efficiency considering the characteristic of water quality and deficiency of recent study. The main study contents are as follows:(1) The removal characteristic and mechanism of TN, NO₃^--N, NH₃-N, TP, DIP , DOP etc in two subsurface flow constructed wetlands planted with Typha angustifolia and Cyperous alternifolius respectively ;(2) The space change and dynamic characteristic of nitrogen and phosphorus, and the water residence time distribution (RTD) in the bed of subsurface flow constructed wetland;(3) Analysis of substrate microorganisms in CW and their correlation with pollutants removal rate.The results showed that:(1) The removal efficiency of total phosphorous (TP) and total nitrogen (TN) was 90.8% and 76.9% respectively in the wetland planted Typha angustifolia under a hydraulic load of 0.08m/d, which was higher than in the wetland...