The Research On The Design Of The Sewage Treatment Project And The Drainage System Optimization In The Jishu Town Shulan City

In recent years,the economic development of jishu town developed rapidly and the population of the town also increased rapidly in shulan city.But the infrastructure and service functions have been insufficient and backwardness.The domestic sewage and some enterprise waste water were discharged directly by the residents of jishustreet and economic development zone.It not only affected the safety of industrial and agricultural production and residents' water security,but also caused pollution of the local river and lower river.Therefore,it is imperative to invest in the construction of sewage works and drainage pipe networks.Firstly,based on the comprehensive analysis and evaluation of the present situation of water supply and drainage engineering in jishu town,the preliminary design of water supply and sewerage network in jishu town of Shulan City is carried out,and then carries on the related optimization design research on this basis.The SWMM model is simulated to verify the rationality and accuracy of the scheme.Finally,the process design of sewage treatment plant is carried out according to the quality and quantity of local sewage.The main findings are as follows:1.Through field investigation and relevant information provided by the local government,the problems of the drainage system are determined in Jishu town.According to the relevant planning of Jishu town,the local topography and other comprehensive factors,determine the local drainage system.And at the same time,I divide the drainage system of Jishu town into regions.It will be divided into two parts:Jishu street sewerage system and economic development zone sewage collection system.The preliminary design of drainage pipe network layout in Jishu town.2.This paper gives a brief introduction to the algorithms of pipe network optimization,finally determines the genetic algorithm as the optimal algorithm through the comparison and selection of various optimization algorithms.When the layout of the drainage pipe network has been fixed in Jishu town,the drainage pipe network of Jishu street is applied to the optimization design of genetic algorithm.Then the related ancillary facilities are designed on the basis of the optimization results.3.The development,module structure and function of SWMM(Storm Water Management Model)Rain Water management model are briefly introduced,andSWMM model software is used to simulate the operation of Jishu street drainage pipe network.4.First of all,determine the site of Jishu town sewage treatment plant,the water quantity and water quality of sewage treatment plant,and on this basis demonstrate the selection of related processes of sewage treatment plant pretreatment,biochemical treatment,advanced treatment,etc.Finally,through the economic and technical comparison between the two schemes,the process of “ the coarse grille and the lifting pump room + the fine grille and the swirling sand settling tank + the CASS biochemical tank + the lifting pump room + advanced processing room + ultraviolet disinfection” was adopted.The design of the related parameters of the structure and the selection and demonstration of the related technology are also carried out.