The Nitrogen And Phosphorus Pollution Of The Landscape Water

With the rapid development of economic and the improving people’s living standard, we have paid more attention to the construction of urban ecological environment. Thus, the urban landscape water bodies have become an important part of city. It plays a significant role in many aspects, such as beautifying the urban environment, forming special landscape water; providing good ecological oxygen source; wetting the air; adjusting rainfall; preserving ground water; reducing the effect of urban heat island and increasing the resisting ability of disaster.Most urban landscape water bodies are closed waters, which have a slow flow of water and a weak self-purification capacity. When concentrations of the nitrogen and phosphorus in water excess the standard, it is easy to cause the eutrophication of landscape water bodies.In the case of the control of point source pollution, the pollution of storm runoff and the release of internal sources have become the major sources of pollutants in urban landscape waters. Therefore, present researches on sources of urban landscape waters mainly focus on qualitative investigation. However, there are few quantitative studies about the pollution of storm runoff and the release of internal sources near/in the landscape water bodies.The aim of this paper is to analyze the sources of nitrogen and phosphorus pollutants in the landscape water body which is located in Eco-city zone established by China and Singapore. In addition, we also explore the vital reasons of the eutrophication according to the pollution of storm runoff and the release of internal sources.Based on the studies on the pollution of non-point sources and the release of internal sources, we analyzed the nutrient loading of eutrophication in the landscape water body and explored the conservation measures for controlling the eutrophication of the landscape water body.The main contents of this study include: studying the structure and characteristics of the pollution model of non-point source and the pollution model of non-point source; Simulating the variation of nitrogen and phosphorus pollutants of the rainfall runoff in New Eco-city of Tianjin in May 10, 2014 and calculating total pollution of annual runoff according to the model of rainfall runoff; Establishing a model of rainfall runoff in New Eco-city of Tianjin and simulating the pollution load of urban runoff, Calculating the pollutant load of the ecological city by the average concentration of event and the total amount of pollutants in the field; Studying the characteristics of the release of nitrogen and phosphorus from the internal sources of the water body; Based on the research of static release to simulate the release quantity of sediment, we also estimated the release values of nitrogen and phosphorus from the internal sources of the water body in New Eco-city of Tianjin in different seasons.Main conclusions were as the following:(1)It is accurate to simulate he variation characteristics of nitrogen and phosphorus pollutants of the rainfall runoff in New Eco-city of Tianjin according to the model of rainfall runoff. The maximum error between the predicted concentration and the measurement is less than 20%.(2)Compared to the total nitrogen and phosphorus pollution in water body, the percentages of ammonia nitrogen, TN, and TP of the water of rainfall runoff sources are 60%~61%,28.5%~29.5%, 31%~32.3%, respectively.(3)Compared to the total nitrogen and phosphorus pollution in water body, the percentages of ammonia nitrogen, TN, and TP of the release of internal sources in different seasons are 0.053% ~ 0.059%, 0.052% ~ 0.056%, 0.104% ~ 0.112%, respectively.(4)The concentrations of TN and TP in waters of New Eco-City are seriously higher than the standards established by China.