Transfer And Transformation Characteristics Experimental Research Of Pollutant In Water Cellar's Sediment

In the northwest of China, many areas have a serious impact on the lives of local people because of less rainfall, strong light, evaporation, the lack of human and livestock drinking water. Taking advantage of water cellar that use roof, farmyard, gully slope and other facilities to collect rainwater, has become the effective and practical solution to the problem of water shortage in northwest area. The cellar can not only alleviate the contradictions of Loess Plateau drought, water and soil erosion, but also find an important way to solve the water shortage area drinking water. However, with the different forms of water cellar in solving rural drinking water safety in the large-scale application, pit water quality problem is also a growing concern. Pit water mainly from precipitation, part of the groundwater and artificial injection of river water. As the water cellar perennial is not clean, pollutants by atmospheric deposition, discharge of waste water, rainwater leaching and erosion into the water, and finally deposited in the end mud and gradually enriched, become a potential source of pollution. The whole process is actually the migration and transformation of pollutants in the pit water and pit water, while the sediment plays a very important role in the transport and transformation of pollutants. Therefore, in order to guarantee in northwest rural drinking water safety and in-depth exploration in arid and semi arid area catchment system, the migration of pollutants in sediment of the cellar conversion characteristics of has profound practical significance. The selection of water cellar is representative of several pollutants were analyzed. Through dynamics experiment, under the influence of different factors, the migration of pollutants in sediment of the cellar conversion characteristics.The research contents and results of this paper mainly include the following aspects:?1? Access to the sediment documentation, through the understanding on the river, lake, reservoir sediment inquiry may exist in the cellar in the sediment pollutants as well as the influence of the migration and conversion factors, ultimately determine the target pollutants for ammonia nitrogen, COD_Mn, UV₂₅₄ and conductivity, factors that affect the aqueous initial pollutant load, sediment content, degree of disorder and temperature; inspect, record cellar inside and outside environment, understand the cellar usage; the required sediment pretreatment and storage and analysis of its physical and chemical properties.?2? According to the river, lake, reservoir sediment adsorption pollutants release the relevant mechanisms, analysis of the absorption of pollutants in the cellar mud and pit water release rules and show the significance of migration and transformation characteristics of pollutants in sediment of the cellar; the quasi level, pseudo second order dynamic mechanical equation of common water quality model of the contents, characteristics and their fitting method.?3? With aqueous ammonia concentration, sediment content, disorder degree and temperature as variables, sediment adsorption of ammonia nitrogen in water cellars were kinetic experiments, build water cellars sediment adsorption of ammonia nitrogen of pseudo first order, pseudo second order kinetic model, to examine sediment content, aqueous ammonia concentration, disorder degree and temperature respectively on the adsorption process influence mechanism. The results showed that the different sediment concentration, sediment quality balance unit of ammonia adsorption of the sediment content and negative correlation, quasi two level dynamics equation than the pseudo first order equation can be used to express the influence of different sediment content of adsorption process of ammonia water; initial ammonia nitrogen concentration, the balance is positively related to quality of unit sediment the ammonia adsorption capacity and initial ammonia concentration, quasi two level dynamics equation than the pseudo first order equation can be used to express the influence of different initial concentration of ammonia adsorption process of ammonia; different degree of disorder, the balance is positively related to quality of sediment on the ammonia nitrogen adsorption amount and the degree of disorder, the first-order kinetic equation than the quasi two level the equation can well expressed in different disturbance degree of ammonia adsorption process; different temperature, the equilibrium adsorption of ammonia unit and sediment quality Negative temperature, quasi two level dynamics equation than the pseudo first order equation can be used to that effect of temperature on the ammonia nitrogen adsorption process.?4? The sediment content, degree of disorder and temperature as variables, of the sediment from the cellar release COD_Mn dynamics experiment, build water cellars sediment release COD_Mn of pseudo first order, pseudo second order kinetic model, to examine the sediment content, degree of disorder and temperature respectively, the release process of the impact mechanism. The results showed that different sediment content, the balance is positively related to unit mass of COD_Mn on sediment release quantity and sediment content, quasi two level dynamics equation than the pseudo first order equation can be expressed in different sediment content release process of COD_Mn; the different degree of disorder, balance the positive correlation of COD_Mn on sediment quality unit the release quantity and the degree of disorder, quasi two level dynamics equation than the pseudo first order equation can be better expressed in different degree of disorder on ammonia nitrogen adsorption process; different temperature, the equilibrium is positively related with the release amount per unit mass of sediment temperature on COD_Mn, quasi two level dynamic equation can be used to that effect of different temperature release process of COD_Mn.?5? The sediment content, degree of disorder and temperature as variables, of water cellar sediment adsorption UV₂₅₄ were kinetic experiments, to examine sediment content, degree of disorder and temperature respectively on the adsorption process influence mechanism. The results showed that different sediment content when sediment content is less than 2g/L, maximum UV₂₅₄ adsorption capacity with increasing sediment content increased rapidly; the different degree of disorder, when the degree of disorder in less than 230r/min, maximum UV₂₅₄ adsorption capacity increases with increase of the degree of disorder, but growth is gradually slowing; different temperatures, UV₂₅₄ adsorption capacity with temperature increasing gradually decreases. When the temperature for intermediate values of 25³0?, the maximum UV₂₅₄ adsorption capacity is decreasing at a maximum speed of.?6? Sediment content, degree of disorder and temperature as variables, of the sediment from the cellar release conductivity dynamics experiment, of water cellar sediment release the conductivity of the linear fitting, to examine the sediment content, degree of disorder and temperature respectively, the release mechanism. The results showed that different sediment content and with increasing sediment content, balancing the release amount of conductivity is increased, the conductivity of the water phase value with sediment content of the overall increase linearly with increasing trend; different degrees of disorder, along with the rising of the degree of disorder, equilibrium conductance release rate also increased, the conductivity of the water phase value with disorderly degree of overall increase linearly with increasing trend; different temperatures, with the rise of temperature, equilibrium when the release amount of conductivity is increased, the conductivity of the water phase values with temperature rising overall showed a linear increase trend.