| The river has extensive resources, it is human important natural resources. Humaneconomic activities have an important effect on the river evolution and the river health, humanactivities such as optional sewage into river and unreasonable exploitation of water resources, itwill directly threaten river ecological environment for losing balance. The EPA (United Statesenvironmental protection agency) put forward TMDL(Total Maximum Daily Loads) in 1972,And our country started the research of water environmental pollution Total amount controlfrom the end of 1970s, for improving the quality of our country water environment, ensuringpeople’s water for life and production, and realizing the safety of our country’s waterenvironment.This paper put Nansha River as the research object, Nansha River -the mother river of thepeople in Anshan City, is one of eriously polluting river in the north. This paper firstly Outlinedthe research progress domestic and overseas of the pollutant total amount control, TMDL andMOS; And then conducted comprehensive evaluation of river health from three aspects: thechemical indexes, biological indexes, physical indexes; Especially introduced the river designhydrological conditions selection and application--rivers design flow for distribution of capacityamount, about the research progress of domestic and overseas, compared the common designflow calculation methods, and analysed the applicability of different calculation methods fordesign flow, on this basis, calculated the TMDL load allocation of the Nansha River. The mainconclusions are as follows:(1) In comprehensive evaluation of river health, score of chemical indexes is 45.22, scoreof biological indexes is 46.67, score of physical indexes is 60.00, the score of comprehensiveevaluation for river health is 48.3, so evaluation result is not eligible for river health.Chemical indexes: COD and ammonia-nitrogen is not up toⅤkind of water qualitystandards, BOD just reach the standards, the TP, DO and heavy metal Hg score higher, sochemical pollution is serious. Biological index: the index of periphytic algae integrity just reach the standards, the index of zoobenthos integrity and fish integrity don’t reach the standards,.Physical index: the state of soil-water loss is better, the river channel had poor stability, andcomprehensive physical indexes reach the standards.(2) In the determination of the three stations design hydrological conditions, the Lishanstation using 30B3 index as the steady-state design hydrological conditions, calculating by theaverage daily flow for many years; Qianshan station and Wenquan station using index ofminimum ecological flow, because of the phenomenon of perennial cutoff. In addition, itintroduced several calculation methods of the design flow without hydrological stations.(3) The Nansha River pollution point-source: COD emissions of industrial pollutionsources is 238.94 tons, emissions of ammonia-nitrogen is 29.45 tons; COD emissions of livingpollution sources is 13786.55 tons, total emissions of ammonia-nitrogen is 1705.37 tons. TheNansha River pollution of non-point source: COD emissions of agricultural pollution sources is2323.73 tons, total emissions of ammonia nitrogen is 37.25 tons; COD emissions of livestockand poultry breed pollution sources is 938.33 tons, total emissions of ammonia-nitrogen is 3.72tons.(4)In the Nanshahe River Basin, confirmed 11 control section according to the generalprinciples of function division, the mainstream ascertained 9 control section, 25 the drainageoutlet divided 5 pollutant district, and using EXCEL to calculate objective function, the waterenvironmental capacity of COD is 2634.20 t/a, the water environmental capacity ofammonia-nitrogen is 134.97 t/a, the water environmental capacity of Hg is 95.91 kg/a. |
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