Water Quality Improvement Technology For Urban Scenery Water In Northwest Region

In recent years, "west developed" the strategic implementation along with the country, the western region's economy step into a nice stage, the cities scope is enlarging all the time, the number of man-made buildings are increasing straightly, all these factors contribute to the result that the amount of water for ecosystem need is hardly assurance, in addition to the influence of the industry and residents, the water system in the city is shrinking gradually, Eutrophication of inside lakes is more and more serious, the city water ecosystem declines seriously, influencing urban scenery and the quality of the water environment directly. This paper base on the characteristics of water environment of the cities in northwest region, be aimed at the condition of the quality of the Landscape water in Xi'an and the current water condition of blocking river in Baoji. From the view of sustainable development, consider the request of the city flood control at the same time, combine the urban scenery water system and the technology of the water quality improvement, some construction policies of improve the urban scenery water quality were brought forward, investigate and empolder the effective, advance, and valuable technology for pollution control and water quality improvement. Main work:(1) Investigate and analyze of water quality actuality of main scenery water in Xi'an, collect the water quality monitoring data, and evaluate the water quality.(2) Field investigation are carried out towards the blocking river in Baoji,collect the hydro geological information of the part of wei river in Baoji, investigate running mode of gate dam, storage scope, water storage and the situation of sediment deposition.(3) Static experiments were carried on by biological floating bed and biological contact oxidation combination technique in order to improve the quality of scenery water body.(4) Studied the characteristics of different kinds of scenery water body and get the suitable measure of water quality improvement.From the studies, the conclusions were gated:(1) The quality of most scenery water in Xi'an is not optimistic,Lianhu Park water, Xingqing lake water are the Category V, Xi'an moat water is the Category inferior V,which all don't reach the Category C in scenery and entertainment water quality standard and have the trend of becoming worse. They are in dire need of taking measures to be improved.(2) The water quality of the blocking river in Baoji only can reach the Category V in the national water quality, and along with the time goes by, the river water quality gradually becomes worse. In order to satisfy the request of flood control and in consideration of the silt sediment isn't serious;suggest adopting fountain aerated and reconstructing the plants on riparian glacis to improve the water quality.(3) The experiment shows that biological floating bed and biological contact oxidation combination technique has a good effect on water purification, especially on the nutriment such as nitrogen, phosphor etc in water. The result of test showed that the removal rate of TN reach 64.44%-66.49%, the removal rate of NH3-N reach 89.08%-99.18%, the removal rate of TP reach 60.98%-87.57%, the removal rate of CODmh reach 16.14%-46.19%.And the growth status of economic aquatic plant is perfect, biology quantity increased quickly. It proves that this technique to improve the scenery water quality is viable and worth expansion.(4) Aimed at the characteristics of water environment in northwest region, put forward the biological-ecological treament and suggest to adopt different technique combination improve the water quality of lake and river landscape water. The main methods are the reconstruction and instauration of hygrophilous vegetation, biology manipulation, spraying microorganism, ecological slope protection and biological floating bed and biological contact oxidation combination technique.