Heat Pump Undercurrent Wetland System Internal Pollutants Degradation Characteristics Research

With the development of society and economy,the demand of environment becomes higher and higher,especially to water environment.To solve these environmental issues,a lot of wastewater treatment pants has been built in recent twenty years,the running of these plants have important role in improving water environment of our country.However,the poor operation effect of low temperature in northern winter has been influencing the application of constructed wetland in the north of China.The article studies the treatment of effluent of constructed wetland on COD?NH4+-N?TN and TP by the experiement research of substrate,plant,and running style.The COD ? NH4+-N ? TN and TP of raw second outlet was 40.25~47.89 mg/L,5.43~19.19mg/L,6.23~14.81 mg/L and 2.27~4.45 mg/L respectively.The constructed wetland has run from January 2017 to December 2017,the better effect of treatment has been gained by one years,running.(1)The steel slag,zeolite and gravel used in artificial wetland as the matrix,the selection of planting reeds and cattail strong alkali resistance;(2)The characteristics of the matrix are analyzed.The matrix was analyzed by SEM and EDS,and the physical and chemical properties of the matrix were clarified,which proved that the adsorption capacity of the matrix on nitrogen and phosphorus was strongly related to the surface microporous structure and the metal elements.At the same time,the matrix was quantitatively analyzed.The results showed that the mechanism of matrix removal was mainly chemical adsorption and physical interception;(3)In the experiment,the influencing factors of wetland treatment effect are found out,including HRT,temperature,DO and p H;(4)Through the simulation of the first order kinetics of pollutant removal,the relationship between the correlation coefficient of the model equation was gotton;COD(0.9602)>TN(0.9317)>NH4+-N(0.8959)>TP(0.8848).