Research Of Rainfall Collecting Cellar’s Sediment Effect Water Quality Of Water Cellars

In arid and semi-arid region of northwest China, because of its unique geographical location and natural environment makes the village northwest people and livestock serious water shortage. In order to solve this problem, rainwater utilization in our country and collection technology were used to get the full attention.Under the correct guidance and the support from government, through the "121 rainwater harvesting project", "water cellar for mothers" and so on,made the cellar rainwater harvesting project widely promotion and application, effectively alleviate the serious lack of fresh water resources in northwest arid and semi-arid regions.Collection of rain water quality characteristics of the complex. However, due to the atmospheric environment, collecting surface and water cellar materials made the water quality to show the difference.Sediment polluted rainwater collection in the pit, and part of the sediment pollution to the bottom of the cellar. All the year round not to clean water cellar, made the pollutants in the sediment accumulate in great quantities, water quality in water cellars resuspension might existed the danger of secondary pollution.In view of this, in order to improve the water quality of water cellars, improved the water quality of water cellars, safeguard northwest rural human and animal health.And for the development, further study of theoretical system of rainwater harvesting, researching of rainfall collecting cellar’s sedimenteffect water quality of water cellars had a crucial practical significance.This paper choosed the typical red mud cellar sediment as experimental sediment, with ammonia nitrogen and UV254, CODMn, conductivity, as the representative of the pollutants. Using experimental methods of kinetics and the isothermal balance of releasing pollutants migration transformation rule form water cellar sediment, and the water cellar sediment concentration, temperature and degree of disorder(oscillation speed), and other factors were analyzed.The main contents and results of this study mainly includes:(1)Water cellar information related to analysis the cellar, pollutants and factors affected its release in the sediment, determines the ammonia nitrogen, CODMn, conductivity and UV254 as research objects, and in the cellar of sediment concentration, temperature and degree of disorder(oscillation speed) as the influence factors of experiment scheme; The physical and chemical properties of rainfall collecting cellar’s sediment(particle size distribution, mineral composition and chemical composition) were analyzed and determined sediment that median particle size are 22.752μm as the test sand, and associated method for preparing the pretreatment.(2)According to the general area of lakes sediment release of contaminants related theory analysis of the water cellar between sediment and overlying water and the effect of water cellar sediment were analyzed for pollutants adsorption desorption mechanism, emphasized on the cellar sediment to the overlying water quality affect the meaning of the research;introduced some related content of common water quality model such as Langmuir and Freundlich isotherm model, Quasi-one and Quasi-two kinetic models, and their characteristics and data fitting method.(3)Set different water cellar sediment concentration for the variable factor, the cellar sediment release of ammonia nitrogen, CODMn, conductivity and UV254 dynamics experiment, the water cellar sediment release of ammonia nitrogen, CODMn quasi kinetics of primary, secondary model were established and the Langmuir and Freundlich two isothermal model, to examine the cellar sediment on desorption rate, balance time and the mechanism of the desorption quantity and quality of the unit water cellar sediment amount of equilibrium desorption of ammonia nitrogen, CODMn and parsing the influence of the isotherm;and the rainfall collecting cellar’s sediment concentration and electrical conductivity were linear fittingto examine the cellar sediment concentration and the correlation of overlying water conductivity. The results showed that with the rainfall collecting cellar’s sediment concentration increases, ammonia nitrogen, CODMn, conductivity and UV254 also increased to different extent;with first order kinetics and quasi secondary kinetic fitting cellar sediment release CODMn correlations are good; Langmuir isotherm with Freundlich isotherm of water cellar sediment desorption fitting of ammonia nitrogen and CODMn were good; rainfall collecting cellar’s sediment concentration and the conductivity linear fitting correlation were higher, this feature for water quality through monitoring the conductivity water quality of water cellars provides an experimental basis.(4)Set different temperature as variable factor, the rainfall collecting cellar’s sediment release of ammonia nitrogen, CODMn, conductivity and UV254 dynamics experiment, the rainfall collecting cellar’s sediment release of ammonia nitrogen, CODMn quasi kinetics of primary, secondary model was establishedto gauge the temperature on the desorption rate, balance the amount of time and the desorption mechanism; and the temperature and electrical conductivity were linear fittingto examine the influence of temperature on the electrical conductivity. The results show that with the temperature increasing, ammonia nitrogen, CODMn, conductivity and UV254 also increased to different extent;the first class and second class dynamics equation to describe the effects of temperature on the rainfall collecting cellar’s sediment release CODMn quasi level slightly better than the accurate secondary process; Temperature and electrical conductivity linear fitting high correlation, this feature provided a theoretical guidance by conductivity monitoring water quality of water cellars.(5)Set different degree of disorder(oscillation speed) as variable, the rainfall collecting cellar’s sediment release of ammonia nitrogen, CODMn, conductivity and UV254 dynamics experiment, and the rainfall collecting cellar’s sediment release of ammonia nitrogen, CODMn quasi kinetics of primary, secondary model was established, in this paper made a research on the degree of disorder(oscillation speed) desorption rate, balanced the amount of time and the desorption mechanism; and the degree of disorder(oscillation speed) to linear fitting of electrical conductivity and electrical conductivity, investigated the degree of disorder(oscillation speed) on the influence of conductivity. The results showed that as the degree of disorder(oscillation speed), ammonia nitrogen, CODMn, conductivity and UV254 also increased to different extent; Quasi secondary dynamic equation of fitting the cellar sediment release ammonia nitrogen effect was slightly better than the accurate first order kinetics equation; Disorder degree(oscillation speed) and electrical conductivity linear fitting correlation was higher, so the conductivity could be used as the rainfall collecting cellar’s sediment suspension level monitoring means, thus to control the water quality of water cellars safety.