Study On Water Environmental Capacity And Total Quantity Control Based On Wasp Model In Harbin Section Of The Songhua River

Songhua River in Harbin section is the most important river basin of Songhua River, the quality of this will directly affect the middle and lower reaches. Because of the Harbin section of Songhua River flows through Harbin City, a large number pollution of industrial, agricultural, living sewage into water bodies, the pollutants in water exceeded the water environmental capacity, and resulting in deterioration of water quality, serious pollution of water environment.Therefore, research on the Songhua River in Harbin section of the water environmental capacity to establish total control system is an important measures to control environmental pollution of the Songhua River.On the basis of hydrology, climate, topography, vegetation and other environmental data of the Songhua River basin in Harbin section, and the water quality data of the state control monitoring section, the water quality data of field acquisition. Using the WASP7.3 version, analysis of water quality model, establish the model of water quality of Harbin section of Songhua River. On the basis of analysis the characteristics of pollutants and emissions of the study area generation, the pollutants of the study area is divided into point source pollution loads and non-point source pollution loads. Calculating the non-point source pollution loads of basin research, calculating the point source pollution loads in using environmental statistical data of Harbin city in 2013. And loading pollution loads into the WASP water quality model, study the pollutant COD, NH3-N, in 2013, in the Songhua River in Harbin section, temporal and spatial variation rule of each section of the study area, and calculation of COD, NH3-N of the water environmental capacity of each section of the COD, NH3-N, and the actual reduction, and then complete the total amount control.The results show that: The Harbin section of Songhua River emissions sewage COD211009.26t/a, NH3-N 30644.54t/a. The non-point source pollution is the main pollution source. From the total pollution load, pollution load of non-point source emissions pollutants COD, NH3-N accounted for 81.11%, 87.97% of the total emissions. From the source of pollution emissions, livestock, farmland, living of city, three kinds of pollution source emission occupied the amount, pollutant COD, NH3-N accounted for89.42%, 91.65% of the total emissions and. The water environmental capacity of the Harbin section of Songhua River is COD 442559.2t/a, NH3-N 39458.5t/a. From the spatial distribution of the water environmental capacity, the water environmental capacity of reaches 1, 2, 3, COD, NH3-N is more than reaches 4, 5. From the time distribution of water environmental capacity, the difference of water environmental capacity between different hydro-logical periods. The measure of the Harbin section of Songhua River COD, NH3-N pollutants cuts, the COD of reach 1 in dry season and normal water period exceeds the water environmental capacity, in the dry season should be cut 6090.64 t, 2597.92t; reach 4 should be cut COD 33400.03 t, NH3-N11260.27t;reach 5 should be cut COD 82926.73 t, NH3-N 11395.68 t.In Harbin section of Songhua River water environment total amount control process, the water environmental capacity is the next year capacity standard value, thus making pollutants COD, NH3-N reduction plan, can grasp the change trend of water environment, and effective management, control, prevention and control of river basin water environment pollution.