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For a period of time has been weak due to the rapid development of China's industry and agriculture and urbanization, as well as people's awareness of environmental protection, the steady flow of large amounts of untreated industrial wastewater and domestic sewage discharged into lakes and other water bodies, resulting in many of our lakes are heavily polluted , and still continue to exacerbate the trend. According to the Environment Bulletin published by the State Environmental Protection Administration in 2007, China's major lakes eutrophication problem still outstanding. Jinyang Lake water quality monitoring data in recent years, the use of the lake (reservoir) eutrophication status evaluation method and water quality identification index Jinyang Lake eutrophication and water quality evaluation. The calculated results for the power plant water supply area, the nutritional status of the three sampling sites in the West Main Canal recharge areas and the center of the lake area graded as moderate eutrophication, qualitative evaluation is moderately polluted; since March 2007 and September Jinyang Lake water quality The overall Class IV, March 2008 and September, the overall water quality of Class V, the Jinyang Lake water quality was deteriorating trend since 2007. Beyond Class V standards for surface water, nitrogen, phosphorus, and chemical oxygen demand (COD), biochemical oxygen demand, deterioration of water quality is worse than Class V risks. Based on the summary of the of lake treatment technology at home and abroad, the use of \Jinyang Lake pollution load weight, transparency and low dissolved oxygen, high organic content of suspended matter of the actual situation, this paper systematically carried out suspended biofilm Jinyang lake water purification effect and purification law. Suspension raw-material membrane research and application of some of the problems existing in further exploration, provide a theoretical basis for the suspended biofilm in the demonstration project application, to make it more scientific, efficient and widely used, so as to Jinyang Lake pollution prevention and control is to find an effective way. Test the first stage by static hanging membrane experiments, analysis and determine the suspended biofilm optimal hydraulic retention time and best water purification effect, results show that: through the reaction cell of CODcr BOD5, NH3-N, TP four water quality monitoring and analysis of the indicators, the best time required removal efficiency of CODcr gt; of BOD5 gt; NH3-N gt; of TP, which COD removal longest, up to 48 days old, and the removal rates of the lowest 43.54%; TP shortest, only 10 days, the removal rate of up to 89.18%. The suspended biofilm process of lake water quality significantly improved effluent BOD5, NH3-N, TP water quality standards has reached surface water IV class Ⅳ class and above, CODcr reach surface water Ⅴ class standard, tests proved COD as Jinyang less degradation of lake water quality indicators. Test the second stage is carried out under conditions of water temperature is gradually reduced from 23 ℃ to 5 ℃, aims to explore more long-term old water purification process to purify water at low temperatures the effect, the researchers suspended biofilm. The biofilm after stabilization on the filler, the static test is carried out, the run time of 31 days, the results show that: the the CODcr initial concentration of 60.6mg / L, the end of the static experiments pool CODcr concentration to 36.0 mg / L, final removal 40.59%. NH3 in an initial concentration of 1.18mg / L, the end of the static experiments pool NH3 concentration of 0.29mg / L, and the final removal rate was 75.4%. Treatment 31 days after the suspension biofilm, the water quality of the lake has been significantly improved, NH3-N to surface water II water quality standard, CODcr reach Ⅴ class standards for surface water, the trials proved once again that COD the Jinyang Lake water quality degradation is more difficult the indicators. Through a two-stage test showed that the use of suspended biofilm Process Jinyang lake, lake water quality has significantly improved the suspended biofilm apply to the prevention and treatment of Jinyang lake.
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