Research On The Pollution Control Of Combined Sewer Overflows In Beijing Based On Deep Tunnel System

In recent years,The overflow pollution problem of the combined drainage system in Beijing has been paid more and more attention.As the strength of water treatment increases,Water pollution has been controlled to a certain extent.But the impact of overflow pollution is still huge that can not be ignore.In the whole process of Overflow Pollution,Technical methods for the control of overflow pollution are as follows :the distribution system of rain and sewage,low impact development and deep tunnel system.But the reconstruction of rain and sewage diversion in the inner city is a hard work,Not only the huge amount of money is consumed,the time needed for the project and the difficulty coefficient of the project are all the important factors of the resistance.The combined sewer in the old city of Tonghui river basin is more than 500 kilometers,length for more than 50% of the total.And the population density of the old urban area in Beijing is a large amount,factors such as space limitation,historical and cultural protection,etc.It is difficult to realize the distribution system of rain and sewage completely.This paper will compare three major overflow pollution control measures,Through scientific and rigorous research and analysis,and absorbing the experience of the optimization process of drainage system transformation at home and abroad,According to the current situation in Beijing such as hydrology and ecological environment,Choosing the suitable measures to optimize the problem of Overflow Pollution and to maximize the improvement of the control of overflow pollution at the present time in Beijing.Carrying out the comprehensive discussion on the concrete use of the measures,the plan of the implementation steps and the plan of the operation.The feasibility of the deep tunnel system is relatively high.It will make an increase in urban land use rate and it’s planned on a moderate scale.The sewage will be concentrated and transferred to the sewage treatment plant by the deep tunnel system,To achieve the purpose of eliminating Overflow Pollution.Deep tunnel can effectively regulate and store the overflow of shallow drainage system,and enhance the capacity of the whole drainage system in flood season.At the same time,it has the dual functions of reducing,preventing overflow pollution and preventing urban waterlogging.Accordingly,In this paper,the construction scheme of the deep tunnel system is taken as the main research topic to deliberate the treatment of Overflow Pollution in Beijing.This paper takes the experience of controlling the overflow pollution at home and abroad to use for reference,Contrastive a variety of underground construction scheme,To make the discussion on the construction scheme of deep tunnel system which is suitable for Beijing and provide a valuable scheme for solving overflow pollution problem in Beijing.