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With population growth and social economic rapid development, Water demand has increased dramatically, But the water environment pollution is getting more and more serious, Ecological water is lesser and lesser, ecological restoration and reconstruction on the eutrophication of the ecological system is the hotspot in the field of water environment study. Eutrophication is caused by high concentration of nitrogen and phosphorus,and it will leed to the explosive growth of algae directly. Ecological engineering repair is the best method in the various repair methods. This method had caused the attention of the domestic and international academic circles for a low cost, low energy consumption and easy management, it is a new technology in improving the ecological environment.This article chooses HanSan grass, lytbraceae, CiGu, iris and canna five plants as the tested plants, in view of eutrophication water of BaGan drain,1will do a static test make use of the technology biological research of floating island. The adaptability of the plant and its purification effect is researched the changes of TN、TP、ammonia nitrogen COD、chlorophyll a,the results are as follows:For HanSan grass、lytbraceae、CiG、iris and canna five plants,the removal rate of TP are respective87.5%,50%,75%,62.5%and83.8%, the removal rate of TN are respective81.1%,62.3%,76.8%,55.1%and75.5%, the removal rate of NH3-N are respective90%,83%,88.3%,77%and92%, the removal of COD are respective72.2%,55.5%,76.5%,55.3%and53.1%, the removal rate of chlorophyll a are respective61.4%,53.5%,55.3%,64.5%and76.8%. The test results show that lytbraceae and iris two plants grew well, removal efficiency of nitrogen and phosphorus are relative weak, removal efficiency of chlorophyll a is relative good. HanSan grass, CiGu and canna have better removal of nitrogen phosphorus、COD and chlorophyll,also can quickly adapt to the water environment of Ba Gan.Considering comprehensively the static test of five plant on adaptation、purifying effect and purification capacity of the environment,HanSan grass, the CiGu and canna are chosen as the dynamic test of scene to repair BaGan.In the dynamic test, the selected plants are established ecological demonstration project by biological floating island technology, the liquidity is very small, the natural environment interfere with larger dynamic conditions, the analysis of water pollutants in ecological demonstration project purification system concentration changes and remove effect. Demonstration project of BaGan was completed, the nitrogen phosphorus and COD are monitored, and the results are as follows,the removal rate of Total nitrogen is from20.6mg/L to2mg/L; the removal rate of The total phosphorus is from1.9mg/L to0.2mg/L; the removal rate of COD is from140mg/L to30-70mg/L, the transparency is from40cm to<80cm-100cm, water quality has achieved V class standard (GB3838-2002). The results show that the it is effective to state and repair the eutrophication of BaGan for reclaimed water landscape river on the test project.At last, nitrogen phosphorus and COD pollutants are determined to use index of the linear regression analysis by the sample point, finally ammonia nitrogen is established by1due to the determination is always error for ammonia nitrogen.The result indicates that prediction model can be forecasted for the stable water region t and it has the certain prediction function for the change trend of ammonia nitrogen of the river. For larger sections on water quality change,it should be modeled by using nonlinear or other prediction method for forecast accuracy is relatively low.
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