Research On Permissible Pollution Bearing Capacity And Wasteload Allocation In Lakes Basin

Lakes are the most precious nutural resources, and offer important values in regulating climate and supplying water resource. They also must develop healthily that are the guarantee for economic society development. However, in the process of pursuing economical benefits excessively, lakes basin resources are threatened seriously and emerged some problems such as lake area shrinking and water quality deterioration that can restrict economical development. Water pollution total amount control technique can relieve water environment problems and improve water environment quality, especially for relatively closed lakes basin. However, in the process of implementing this technique, there are also some problems in the reasonable determination of a total amount control goal and the creatment of the feasible control programs. Therefore, it is urgent need to construct water quality model combined with the situation of lakes basin, and study water pollution total amount control technique.Based on the analysis of the practice demand of water pollution total amount control in lakes basin, the paper takes Tangxunhu lake basin in wuhan city as an exmple to research permissible pollution bearing capacity and wasteload allocation in lakes basin, according to the exiting problems. The main contents include some aspects as follows:â‘ Summarize the characteristics of lakes basin, identify the pollution sources, illustrate pollution features in different stage, discuss the total amount control theory and distribution methods and establish a total amount distribution hierarchical structure model of lakes basin;â‘¡Construct water environment model combined with the general situation of Tangxunhu lake basin, which contains two-dimensional flow model and water quality model, and use the monitoring data and experience data to calibrate and verificate it. The simulated results show that the average error of CODMn,NH3-N,TN and TP are between the ranges from 10 percent to 40 percent, and the monthly change tendency in years is similar to the monitoring data; â‘¢Estimate pollution load in lakes basin and calculate water body permissible pollution bearing capacity in current year and planned years in various frequency of precipitation. Based on the results, analyze the influent factors, including target of water quality protection in lakes basin, water body features, pollutant characteristic input to lake, arrangement and discharge way of the layout of sewage outfall and scheduling rules;â‘£Apply the total amount distribution hierarchical structure model to allocate wasteload in Tangxunhu lake basin. The results indicate that the program is rational and can help the administration department to implement. In order to gruantee the implementation of total amount control programs, water environment measures of each pollution source are designed.This paper analyzes the key problems of permissible pollution bearing capacity and wasteload allocation in water pollution total amount control technique, discusses the total amount allocation methods, enriches the water quality management system of lakes basin, and applies the method to Tangxunhu lake basin. The researches results can offer technical support for water quality management and have an important significance to water resource protect work in lakes basin.