Study On The Treatment Of Black And Smelly River In The City

Dongjiang River Basin is the main water supply source in the east of Guangzhou,Shenzhen,Heyuan,Huizhou,Dongguan and Hong Kong SAR,which guarantees the water demand of nearly 40 million people and is an important "political water,economic water and life water" in Guangdong Province.Based on the field investigation of Yonghe River,this paper analyzes the serious factors of water environment pollution,the process of treatment and existing problems,and takes the Yonghe river pollution treatment project as the research object.The indexes of ammonia nitrogen,total phosphorus,total nitrogen,oxygen consumption,dissolved oxygen,chemical oxygen demand,five-day biochemical oxygen demand,etc.in Yonghe River are all seriously over the standard,and they are inferior V-type water bodies.The main components of the sediment are nitrogen,phosphorus and organic matter.The content of heavy metals is not over the standard,and the deposition is serious,which is more than 0.8m in some parts,resulting in the secondary pollution of Yonghe river.According to the guideline for the treatment of black and odorous water in cities,the comprehensive treatment route is to control the source and intercept the pollution,control the internal pollution and restore the ecology.However,due to the fact that the outer contour of the coastal buildings is close to or beyond the revetment,some of the river channels are narrow and the terrain is low-lying,so it is very difficult to use gravity pipe to intercept the sewage,which is almost impossible to implement.This problem is common in the old urban area of Dongjiang River Basin.In order to solve this problem,negative pressure drainage system is proposed.In view of the long-term difficulty in removing the pollutants in the tributary,it is proposed to use the magnetic separation water purification technology to purify the river and reduce the pollution of pollutants.Finally,MIKE11 is used to evaluate the improvement of river hydrodynamic force and water quality brought by the engineering reconstruction measures,and it is determined that the scheme can really achieve the main target of eliminating inferior V class.According to the latest data from the Environmental Protection Bureau,the water quality of Yonghe river has improved significantly,and the treatment has achieved preliminary results.The experience can be gradually extended to the Dongjiang River Basin,especially to the areas with dense riverside and no gravity pipe sewage interception project.Lay a solid foundation for the realization of "sponge city" in the future.