The Research And Application Of Total Waste Load Allocation For Water

As one of the most important part of Songhua River,it is responsible for Songhua River in Harbin to providing water that used in daily life of Harbin's people.As a recipient of the production of sewage in Harbin City,the water quality of the watershed directly affect the downstream water quality.A large number of living,industrial and agricultural sewage through the sewage which is distributed along the Songhua River pour into the Songhua River.Therefore,it is necessary to calculate the capacity and point source and non-point source pollution load of Songhua River in Harbin,and then allocate the total amount of water pollutants in the water environment pollutant.In this study,the water capacity of the Songhua River in Harbin was calculated by using the one-dimensional water quality model.According to the generation and emission characteristics of pollutants in the study area,the pollutant type is divided into point source pollution and non-point source pollution,then calculating their pollution load.The method of multi-objective optimization allocation was used to allocate and reduce the total amount of water pollutants in the pollution sources in the study area.In this paper,we design and implement the total water pollution control system based on B/S structure to realize the operational operation of the system.According to the research results,the calculation and distribution of the total amount of the Songhua River in Harbin are realized in the system.The results are as follows:?1?In this study,the water capacity of six generalized reach of the Songhua River in Harbin was simulated by using the one-dimensional water quality model.Results show that:COD's water environmental capacity are 157114.61 t/a;among them,COD's water environmental capacity in wet period are 86457.306 t/a;COD's water environmental capacity in flat wet period are 30628.41 t/a;COD's water environmental capacity in melting water period are 25493.36 t/a;COD's water environmental capacity in frozen period are 14535.53 t/a.NH₃-N's water environmental capacity are 32439.4t/a;among them,NH₃-N's water environmental capacity in wet period are 18706.04 t/a;NH₃-N's water environmental capacity in flat wet period are 7555.28 t/a;NH₃-N's water environmental capacity in melting water period are 3516.67 t/a;NH₃-N's water environmental capacity in frozen period are 2661.41 t/a.?2?According to the generation and emission characteristics of pollutants in the study area,the pollutant type is divided into point source pollution and non-point source pollution.among them,Point source pollution includes urban life pollution sources and industrial pollution sources,Non-point sources include rural life pollution sources,livestock and poultry breeding sources,farmland pollution sources and snowmelt pollution.Results show that:In point source pollution,urban life pollution accounted for a large proportion,COD into the river is 56283.82t/a;NH₃-N into the river is 8607.96t/a;Industrial pollution accounted for a small proportion,COD into the river is 2454.1t/a;NH₃-N into the river is 485t/a.In non-point source pollution,livestock and poultry breeding accounted for a larger proportion of pollution,COD into the river is 39693t/a;NH₃-N into the river is 239.87t/a;in rural life pollution,COD into the river is 1581.73t/a;NH₃-N into the river is 158.77t/a;in farmland pollution,COD into the river is 2980.13t/a;NH₃-N into the river is 1946.98t/a;in snowmelt pollution,COD into the river is 3481.85t/a;NH₃-N into the river is 32.02t/a.?3?Based on the TMDL water quality management model,the maximum pollution load values of COD and NH₃-N in the six sections of the four water control units were calculated on the basis of the capacity calculation results and the pollution load results.On the basis of the total distribution of water pollutants in each river,the proportion distribution method is used to allocate the total amount of pollutants to each region.At the same time,the Gini coefficient method is used to evaluate the fairness of the secondary distribution.Results show that,the Gini coefficient of population and GDP is less than 0.2.Therefore,it is reasonable to allocate the proportion of COD,NH₃-N can be the total amount of pollutants,whether by population or by GDP and it has a strong fairness.?4?This paper develops a traffic control system for water pollution control based on B/S structure.The system is based on a MySQL database-based database,OpenLayers and AJAX combine the technology to achieve the basic functions of the system map and calculate the capacity with MATLAB combined with C#.NET technology.The allocation model is simplified to the system,the system to achieve the operational operation,the development of the corresponding total emission reduction mode.