Pollution Sources and Loads of Nitrogen and Phosphorus in Xinlicheng Reservoir of Changchun City
The analysis and quantification of nitrogen and phosphorus pollution sources is the base before managing the Xinlicheng Reservoir. To master the pollution sources and loads helps to take measures for improving the water quality. NH3-N and TP were the key pollutants resulted in deterioration of water quality by water environmental quality assessment method. The pollutants were from upstream flow and surrounding drainage of the reservoir. The surrounding drainage pollution sources consisted of point and non-point sources. The loads from upstream flow and surrounding drainage were estimated by mean concentration method and reservoir water quality model. The daily fluxes of ammonia nitrogen and total phosphorus in the snow-melting period and wet season were 1 708. 0 kg,255. 0 kg,and324. 7 kg,336. 8 kg into the reservoir,respectively. The input point source loads per day in snowmelting period and wet season were 30. 5 kg NH3-N,8. 3 kg TP,and 46. 3 kg NH3-N,47. 8 kg TP,respectively. And the input non-point source loads per day in the snow-melting period and wet season were 96. 7 kg NH3-N,6. 4 kg TP,and 36. 5 kg NH3-N,59. 2 kg TP,respectively. The pollution loads from the upstream of the reservoir was the key source. It is imperative to control the upstream water pollution and to reduce the surrounding pollution sources for the safety of drinking water source.