Study On Pollutant Emission Law And,Coefficient Of Urban Domestic Source Water In Gansu Province

With the case of the household registration system reform and continuous urbanization rate rising,urban domestic source of water pollutants has continued to increase,and the sources of water pollutant discharge have also become more diverse.These have serious impact on the quality of the water environment.Therefore,studying the pollution law of urban domestic source water pollution has important guiding significance for water pollution treatment and scientific management in the arid regions of the west.Based on the collection of the influent water quality of urban sewage treatment plants in Hexi,Longnan,Longdongand Longzhong,the article combines the typical monitoring city Lanzhou as the object of inquiry.The mathematical and statistical methods are used to compare and analyze comprehensive sewage hourly and monthly from different regions,administrative levels and industries.Based on this,the coefficients of discharge factors of domestic sewage water quality characteristics in each region and Lanzhou City are calculated.The calculation and investigation of the production coefficient of urban sewage pollutants provides a basic reference.The main research conclusions are as follows:Comparison ofdomestic sewage discharge from sewage treatment plants in different administrative regions of the province: Longzhong area> Hexi area and Longdong area> Gannan Tibetan area and Longnan mountain area.Comparison of domestic sewage water quality: Longdong area> Hexi area and Longdong area> Gannan Tibetan area and Longnan mountain area.Comparison of typical monitoring comprehensive domestic sewage flow in Lanzhou: town> urban area> county town;the comparison of the comprehensive domestic sewage concentration in Lanzhou: county town> urban area> town.The pollution factor value rangeof CODcr,BOD5,ammonia nitrogen,total nitrogen,and total phosphorus in each region of Gansu Province are 13~29 g/person/d,5~13 g/person/d,1.3~2.7 g/person d,1.9~4 g/person/d,0.32~0.47 g/person/d respectively.Typical monitoring urban administrative districts' CODcr,BOD5,ammonia nitrogen,total nitrogen,and total phosphorus pollution factor values range from 13 to 28 g/person/d,13 to 17 g/person/d,2.7to3.5g/person d,3to 5.4 g/person/d,0.3 to 0.6 g/person/d respectively.