Non Point Source Pollution On Water Pollution Contribution Of PanJi No.1Mining Subsidence Area

The seriousness of Non-point source pollution to the water body is increasingly presented. following point source pollution.This paper selects Huainan Panji No.1mine as a study typical object as a typical subsidence area use the AnnAGNPS model to simulate the impact of the water quality of collapsed zone,in addition,collected the PanJi mining subsidence area from2002to2010the agricultural non-point source pollution data,the contribution of agricultrural non-point source in the study area. The main conclusions are as follows:1.according the Huainan2005to2010Water Quality Bulletin, Panji mine masured rainfall average is972.13mm,and use AnnANGPS simulation for six years the average annual rainfall is1002.40mm, the simulation results is pretty better;2. use AnnANGPS model to study Panji mine, results show that, average annual total nitrogen, total phosphorus, total organic carbon, total sediment load in the study area are115162.97kg/yr183810.35kg/yr,106322.67kg/yr,36201.80kg/yr;3.Pollutants space distribution is uneven vary from Different land use types. Pollution loads of nitrogen and phosphorus sequence is cultivation> residence> reclaimed land> waste rock pile;4.By the Universal Soil Loss Equation, combined with the formula for regional soil erosion=Σ single grid cell soil erosion modulus*grid cell area, to calculate the regional average total amount of soil erosion2762.48t/a; about the soil erosion intensity grading of the Panji mine soil erosion is a moderate erosion, need to focus on soil erosion, prevent erosion of the degree to become worse.5.study of agricultural non-point source pollution in type collapse area of PanJi from the year2002to year2010showed a declining trend; results of2010show that: COD major source of pollution account for56.70%of the total emissions coming from raise animal.TN's major source of pollution comes from domestic pollution, accounting for54.05%of the total emissions. TP's main sources of pollution comes from domestic pollution, accounting for42.48%of the total emissions from livestock;6.according to the calculation of Panji mining area water environmental capacity, the results show that only consider non-point source pollution and the point source pollution excluded, COD emissions amount is far below the COD III and IV of the control objectives, emissions of TN amount is between Ⅲand Ⅳ control objectives, TP emissions volume is more than Ⅲ and Ⅳ control objectives.