The Accessibility Research Of River Water Quality Target Of Receiving Comprehensive Drainage River In Town

Dingshan river is originated in baiyunzhang, through the xinxu town huiyangdistrict and shenzhen Pingdi town from north to south, and finally into the Longgangriver, belongs to transboundary rivers in huizhou, shenzhen. Dingshan river basin as atypical disorderly development area of the pearl river delta region,due to weakinfrastructure, and difficult environmental regulation. A lot of life and industrial wastecollection has not been effectively collecting, processing, and straight line into therivers of Xinxu town. Make the water quality deterioration.Not only has a harmfuleffect on the health and living environment to the crowds, and affect the water qualityof Longgang river,Danshui river and Xi ZhiJiang river, in turn, directly influence thesafety of drinking water of Dongjiang river, Restricted the social and economicdevelopment of the region and to promote the quality of life of residents.As the tamsui river basin pollution comprehensive treatment of gradual,Riverwater environmental improvement is imminent, As the work of Danshui basinpollution comprehensive treatment go on Step by step forward. River waterenvironmental improvement is imminent,Guangdong province puts forward "threesteps" principle in the transboundary rivers: the first step is to finish the water qualityindicators of NH3-N≤4.4mg/L in Shenzhen and Huizhou transition section at the endof2012.The rest to complete Ⅴindicators up to the surface water standard of thetarget. The second step is to finish water quality indicators of NH3-N Ⅴclass ofsurface water standard at the end of2015, The rest to complete Ⅳindicators up to thesurface water standard of the target. The third step is to finish Ⅲ kindlywater qualityindicators of the surface water standard of the target at end of2020.The representative of town receiving comprehensive drainage rivers–Dingshanriver, Based on the river water environment features as the research object, With water quality standards as the research target. On the basis of collecting andconsulting a large number of literature. By using the method of data analysiscombined with field investigation.Scientific analysis the current situation of butylriver water environment quality,Pollution status quo,the existing sewage disposal.Through scientific calculate the water environmental capacity,put forward a riverwater quality calculation model which is suitable for Dingshan river. According to thecalculation results,Put forward the corresponding prevention and control of waterpollution solutions and measures,（1） increase the rate of scale of sewage treatmentand sewage collection, sewage treatment;（2） through the control of river basinpopulation to control the discharge of sewage;（3） through the water diversioncapacity to improve river runoff. And on the basis of the above three measures putforward five proposals, Through scheme comparison finally concluded that:In2012,131000pepole,40000t/d sewage treatment, sewage collection rate of90%,allthe depth of processing, Dingshan river all section water quality indexes can be Vclass water quality of surface water standard. In a population of more than147000,40000t/d sewage treatment, sewage95%collection rate, depth of processingconditions, the river main water quality indicators (such as COD_Cr, BOD5) canbasically achieve Ⅲclass standard of surface water in2020.