Water Environmental Capacity Based On WASP Water Quality Model

With the revitalization of northeast old industrial base in the acceleration, Tieling as a key development industrial city, the increasing of domestic wastewater and industrial wastewater emissions cause adverse effects in the production and living of the local people .In order to achieve conservation of water resources, the purpose of protecting the water environment, scientific and accurate grasp of the environmental capacity of the local water environment in the future based on the basis of governance, in accordance with the "prevention first, prevention and treatment integrated, comprehensive treatment" principle to strengthen the point source governance, limit emissions to a reasonable extent, the need for water environmental capacity, based on the management of water pollution control system, and gradually achieve total control based on environmental capacity, and put the total control theory into practice in environmental management and environmental planning. Scientific and reasonably achieve each source of determine emissions in regional, watershed, or administrative region.In this paper, Qinghe river which is a tributary of the Liaohe river in Tieling City as research subjects, selected water quality model WASP which was developed by the U.S. EPA Environmental Research Laboratory, can be used for different dimensions, different water analysis and prediction which due to natural and man-made pollution (which is divided into hydrodynamic and water quality model WASP model DYNHYD two parts) for the water environmental capacity calculation. First, investigate and analysis the water quality data , the status of water pollution and sewage situation of Qinghe river which was measured in 2008, use CODcr,NH3-N as indicators to explore the water environment capacity calculation methods, simulate the water quality status by using WASP model and prove the feasibility and effectiveness of WASP model in the basin of Qinghe river . The relative error of simulated values and measured values of the water quality monitoring sections COD,NH3-N concentration in Qinghe river and the flow of Kaiyuan prove that the WASP water quality model is suitable for testing the applicability of the Qinghe River Basin. Then, follow the "water function zoning in Liaoning Province" , study of reaches will be divided into a number of river reaches and to determine the corresponding calculation of the water quality objectives, using WASP water quality model to calculate each river in the dry season and wet season 50%, 75% and 90% of six different rates of water environment capacity , in accordance with the "control section compliance" principle, to calculate the six conditions of river water environment capacity, combined with the actual emission situation in the study area and hydrological conditions, and ultimately determine the guaranteed rate to 90% of the dry season and wet season 90% of the guaranteed rate of the water environmental capacity of river water environment capacity as the value range. According to the results of water environmental capacity, in order to achieve effective control of pollutant emissions, and improve the quality of water environment objectives, allocate the total discharge control targets of study reaches water environment capacity ,determine the main stream of the sewage outfall of each vertical and allowed emissions of enterprises, as well as tributaries of the control objectives, implement the total quantity control in the study area and propose the corresponding pollution control measures.