Nitrogen And Phosphorus Model On Ecological Restoration In Landscape Water

Landscape water ecological restoration techniques due to low cost, long lasting, beautiful effect and has become a research hotspot in recent years. The current situation through a mathematical model to simulate the effect of ecological restoration for water treatment has also been increasingly recognized, with domestic and foreign researchers to obtain a large number of experimental data by computer to establish a large number of models. The late1960s, Vollenweider through the establishment of a simple phosphorus change models predict the nutritional status of lake water. Later Imboden and Lorenzen improved this model and others, to make the model more accurately simulate changes in lake phosphorus. Joregensen using a moderately complex eutrophication model to study16different types of lakes were simulated, the results show that:as long as the improved model and simulate the lake to be consistent with the higher ecosystem characteristics, and taking into account the must be the element loop, then the model is simulated and the smaller the deviation between the measured values. Domestic Liu Yusheng by studying the Dianchi Lake, nitrogen, phosphorus and carbon temporal and spatial distribution of zooplankton, algae and sediment dynamics on the basis of nutrient release, and the box and the combination of two-dimensional hydrodynamic model, built according to the Dianchi Lake eutrophication model for a particular environment. Li Yiping [5] using coupled three-dimensional and two-dimensional model of wind-lake water quality model, the establishment of a lake eutrophication model that can simulate wind-lake total phosphorus, total nitrogen, chemical oxygen demand, but also simulate the growth of algae in Taihu Lake and the demise of other conditions. Total, the domestic use of a large number of models, played on the rivers and lakes of more accurate simulation and prediction, this prediction on the environment and ecology are of great significance, through the use of the model, the results of the analysis model can be further understanding of nutrients in lakes and rivers on the impact of trophic structure.The study dealing with the use of eco-float bed technology landscape Riva River water and establish a phosphorus attenuation fitting equation, the kinetic model of nitrogen and nitrogen removal Stella simulation model, the above model as a guide floating bed technology in a variety of ecological pollution the practical application of water to provide the research base. Main findings are as follows:(1) Eco-float bed technology Riva river water quality for better purification effect of nitrogen and phosphorus in different hydraulic load and load conditions, a variety of floating-bed plants on NH4+-N, TP, CODMn, TSS and Chl-a and other pollution indicators has a significant role in removal. The highest removal rates reached91%,92%,36%,83%and60%. Mixed pool is the best pool.(2) By fitting the experimental data of total phosphorus pool of eight response attenuation equations, respectively:y=0.397e-0.0795x; y=0.3945e-0.0335x; y=0.3158e-0.0806x; y=0.3713e-0.053x; y=0.3309e-0.0954x; y=0.3645e-0.0798x; y=0.4115e-0.1071x; y=0.3015e-0.0123x. Equation obtained by fitting the decay of the total phosphorus in the reactor ability to sort of place:mixed pool> yellow iris> spinach> water hyacinth> Lythrum> Water celery> iris> then force flower.(3) The program established by Metlab nitrogen cycle dynamics model, using fourth-order Runge-Kutta solution to solve the model. It based on the model fitting and correction. The computational model of the efficiency factor is about73.2%, sensitivity of the model simulation of the general.(4) using software created Stella nitrogen removal model, were obtained by running the software Stella7days90days150days simulation curve predicted by the model and the actual value analysis to get a high correlation between the two.