Fuxian Lake Phosphorus Pollution Of Water Bodies And Control Measures

The lake is an important component of land water resource, which is valuable resource indispensable for people's life. However, with the development of urban and industry, the problems of water resource and waster quality are becoming more and more serious. Among the various water pollution in lakes, water eutrophication is the most serious one, which is the most widespread and harmful problems in water environment, and it has become a puzzle in water pollution treatment around the world. Recently, a lot of research show that phosphorous is the major limiting factor in lake eutrophication, so the control of phosphorous' content is an efficient way to prevent water eutrophication.Fuxian Lake is a phosphorous-control style lake. Many years of water quality monitoring results show that the water quality of Fuxian Lake is on slowly descending tread, but the water transparency is significantly decreased, with the amount of algae boost and TN,TP on the rise significantly, so the water eutrophication of Fuxian Lake is getting accelerated. The ecosystem structure of Fuxian Lake is extremely simple and vulnerable, and the exchanging water period is so long as 167 years, which means it is impossible to be recovered once polluted by eutrophication. Therefore, research and analyze both the phosphorous pollution and control measures of Fuxian Lake shows great significance.Based on the investigation of the current situations, this paper consults a large amount of relevant literatures, with the combination of Fuxian Lake water quality monitoring data, analyze the amount of pollution emitted by various sources of phosphorus pollution entering the lake by use of sewage water coefficient method, calculate the allowable phosphorus emissions of Fuxian Lake, and propose the control measures to sources of phosphorus pollution. Preliminary results are as follows:(1)Phosphorous in Fuxian Lake is mostly from non-point source, of course, that from point source is also vital, especially from sewage. Advancing of waste water treatment plant is so important.(2)Phosphorous in Fuxian Lake from non-point source, especially domestic breeding and fertilizer, is most, about 47% of phosphorous input. Another source is phosphorous mine and chemical plant. The input of phosphorous in Fuxian Lake is about 21.25t/a. The phosphorous load of dried wet deposition input is about 22.95 t/a, which is mostly impacted by the air pollution around the lake, especially the phosphorous mine and chemical plant. So, the treating for phosphorous mine and chemical plant is necessary.(3)The phosphorous capacity of Fuxian Lake is 59.29t/a, which is far below the phosphorous input load (132.97t/a). What's more, the retention of phosphorous in water is so high (96.8%). The phosphorous input load should be cut greatly, what can prevent the eutrophication of the lake.Study about the management and engineering measurement can be carried out according to the non-point source: agriculture pollution, phosphorous mine and chemical plant. The study can provide the practical consultation and help making the decision about the management and treatment of Fuxian Lake.