Research On The Sewage Purification Of Wetland Plant In The Downstream Region Of Tumen River

In the trend of the regional cooperation and development in the Tumen River, with the rapid development of our country economy in the recent years, it is bound to cause the regional water pollution and a series of environmental problems. Although a batch of industrial sewage treatment plant and other treatment facilities have been built up with the strong promotion of the country, Jilin province and yanbian area government, the treatment of water and agriculture, secondary sewage discharge still can cause any of the eutrophication of water quality problems, etc. This area is located in Korea, Russia, in the border zone, the geometric center of northeast Asia, it also has the important influence geographical location in the international society, how to use the ecological management technology effectively and deep solutions to local water pollution problem is directly related to ecological environment protection and the local residents drinking water safety event and the people’s livelihood.Based on the first time pollution sources and the environmental quality report of basic data on the2009Yanbian, and with the water quality field the testing results of This research make a preliminary analysis on the water pollution and water quality of the source of the tumen river downstream. Make the tumen river downstream typical wetland sewage treatment plants as the main research object, research the plant purifies sewage test, comparing different hydraulic retention time influence, the plant decontamination plant efficiency and the rhizosphere effect of soil microorganism quantity, as well as various environmental factors synergy and decontamination mechanism analysis, etc. The results of the study show that:(1) The water environment in the Downstream Region of Tumen River:Hunchun river water quality is good, monitoring items are all up to almost the behaviors of water environment protection function objectives. The tumen river mainstream is the most serious pollution from hedong section to estuary, the region’s main source of water pollution are from the local agricultural sewage and sewage discharge, the main pollution substances for COD, ammonia nitrogen, petroleum etc.(2) This paper used constructed wetland plants reference domestic, matching the tumen river downstream main types of wetland plants, make three kinds of wetland plants as the research object, such as Carex heterolepis, Carex rhynchophysa and Phragmites australis. The wetland plant the system synthesis decontamination ability is Carex heterolepis>Carex rhynchophysa> Phragmites australis>no plant system, and theCarex rhynchophysa and Phragmites australis comprehensive decontamination ability approximation, this and three kinds of wetland plants the number of rhizosphere microbes was significantly correlation.(3)This paper studies the hydraulic retention time (HRT)=1,3,5,7d, the effect of the plant system on pollutant purification. Wherein,①For chemical oxygen demand (COD) removal:HRT=3d, COD removal reaches maximum, and then the removal rate tends to stability, the wetland plants for COD removal system to significantly is higher than no plants of wetland systems.②For nitrogen removal: with the increase of the residence time, system value of dissolved oxygen(DO) in decreased gradually, making the ammonia nitrogen removal rate is lower, but the plants of total nitrogen removal system has been rising trend gradually.③For phosphorus removal:when HRT=5d, of phosphorus removal rate achieve maximum.(4)This paper make the correlation analysis and linear regression analysis with the Excel to each wetland plant system of environmental factors, and work out the linear equation, which can be used with a highly significant correlation equation, to estimate the other environmental factor, this method has a certain practical value.