Research On Ammonia Load Calculation Of Niuwei River And Beili River Of Haihe River Basin

The main area of Haihe River Basin located in the plains with high level of development of agriculture and industry. Industry wastewater and domestic sewage discharges increased year by year in urban plain area, most of the river showing a conventional water supply characteristics because of decreasing natural runoff. Serious consequences of changes in river runoff is the watershed nitrogen pollution problems which have become increasingly prominent. Ammonia nitrogen pollution of most rivers in the Haihe River Basin has been replaced by chemical oxygen demand(COD) to become the primary pollutant, NH3-N is 1-10 times of grade V of excessive site. NH3-N pollution in the Beisan river and Ziya River is most serious, excessive ammonia is harm to the water environment, so that the water gradually deteriorate and lose its ecological function.In this study, Niuwei River and Beili River of Fuyang River was selected as the studied river in order to find out the fact of the source of ammonia nitrogen, the relative contribution and the key factor in providing a basis for ammonia nitrogen pollution.The paper conduct a comprehensive study in river water input, output and endogenous transformation respective item of accounting factor from a point source emissions, point source emissions and endogenous conversion with the method of data statistics, model simulation and experimental simulation. By means of calculation and summary, this paper draws the following conclusions:(1) Ammonia net stock in Niuwei River and Beili River: 610.219 t /a.The exogenous input 1347.458 t / a, endogenous input 45.457 t / a, output of the ammonia nitrogen at 782.696 t / a.(2) Full of ammonia into the river is mainly from the point source of ammonia emissions, accounting for 93.1% of the amount of the contribution of ammonia into the river. The main contribution of point source emission factor from large to small in turn for the urban sewage treatment plant drainage, drainage outfall enterprises along the river, a tributary of pollution in the river, they are a main role in six sections. The industrial outfall discharge focused in the river Ⅰ, Ⅱ and Ⅴ. Promote the WWTP effluent quality playing a key role in the basin ammonia nitrogen control.(3) For each river, except for the upstream inflow of ammonia nitrogen pollution, pollution input maximum is as follows:Ⅰ- sewage treatment plant drainage, Ⅱ- outfall drainage, Ⅲ- agricultural non-point source, Ⅳ- urban sewage treatment plants drainage, Ⅴ、Ⅵ- pollution tributaries. Above paragraphs input indicates that, each section of the ammonia into the river pollution from point source discharges.(4) Non-point source of ammonia into the river contribution of the whole section: agricultural nonpoint source, accounting for 35.4% of non-point source contribution, indicating that the pollution of agricultural fertilizer by surface runoff into the water column is the main way of non point source pollution of ammonia, Secondly, for urban non-point source, accounted for 28%, resulting in this phenomenon the reason is generated by rainfall Road area of water discharged directly into the river through the drainage system of pavement, causing ammonia has poured into the river.(5) The maximum contribution term of ammonia output are river output and the river bed infiltration, output and infiltration capacity were 327.208 t / a and 320.292 t / a, greater infiltration of water, which may be near the river diving wells for irrigation resulting in.The output of farmland irrigation water and ammonia volatilization were 99.722 t / a and 35.474 t / a respectively.