Study On Mechanism Of Wetlands Water Quality Purification

Wetlands are composed from the interaction of the water, soil and water and wetland plants (which can be associated with other aquatic organisms) on the Earth's surface, they are natural syntheses that internal processes under the control of water for the long-term. Wetland system has unique hydrological environment, so that it has a water purification capacity. People has recognized that wetlands played important roles on environment since the beginning of the last century, but the development of large-scale human activities , frequent natural disasters, and other factors caused different impacts. Because of the complexity of natural wetlands environment and the study conditions is not controllable, so people mainly on the study of constructed wetlands water purification mechanism.Wetlands have some functions, and this paper is major in the research of the purification of wetlands. Wetlands purification is the process that, wetlands have an effect on the physical, chemical and biological reaction to pollutant and suspended material. Such effects are in the role of plants, microorganisms and the circulation and transformation process of substance in wetlands, such as the carbon cycle, the conversion of nitrogen and phosphorus and the removal of heavy metals. Base on these we will analyze the mechanism of wetlands purification.In this paper, I used single-factor water purification rate to calculate the purification rate of wetlands. The formula is as follows: In this formula, Ciup means the concentration of the single-factor in the upper reaches of the river; Cidown means the concentration of the single-factor in the lower reaches of a river; J means the water purification rate.Based on the single-factor water purification rate, I use the single-factor of mass water purification rate. The formula is as follows:In this formula, Qup means the water flow in the upper reaches of the river; Qdown means the water flow in the lower reaches of a river; J means single-factor water quality purification rate.The environment of the wetlands is complex lead to the process of water purification is so complex. And there are several interactions between the factors. Because of interactions are complex and uncertain, the grey model may analyze the interactions between the factors.In this paper, I use the single-factor evaluation and comprehensive pollution index to make the water quality assessment of Zhalong wetlands. The result of single-factor evaluation is that, the permanganate index, COD and nitrogen are exceeded the standard. In the dry water season, the water quality is the worst. The result of the evaluation of comprehensive pollution index is that, the water quality in the entrance of Zhalong wetlands is the worst and water quality in the dry water season is also the worst.In this paper, base on the analysis of Zhalong Wetland single-factor water purification, most of the pollution have been purified. The least is nitrogen in September, that is -98.95%, the most is nitrite nitrogen in September that is 88.96%. Analyze the single-factor of mass water purification rate; the most is nitrite nitrogen in September that is 97.1%.And the least is nitrogen that is 47.01% in September. Base on the Analysis of the grey incidence degree, the pH have a impact on many factors. The DO have aimpact on the reaction of many factors as N, P.In the end, the Mechanism of Wetlands Water Quality Purification is as follows:Filtration and sedimentation and adsorption of wetlands Water pollutants can be flitted by plants of Zhalong Wetland. And the pollutants were used by plants.Wetland plants absorb pollutantsThe plants in Wetlands need more nutrients. These plants will absorb N, P to be a part of them. So the pollutants can be removed from water.The accumulation of pollutants by wetland plantsThe heavy metals can be removed by the way of adsorption, ion exchange and diffuseness in the root zone of plants. At last these heavy metals accumulated by the plants.microbial degradation in wetlandsIn Zhalong wetland environment, there are all kinds of microorganisms and protozoa which can reduce the organic. The N, P and organic can be used efficiently by microorganisms. So the water quality get more better.The analysis of Zhalong wetlands as an example may play a certain role of wetland water purification mechanism of research and the protection of Zhalong wetlands.