Chuzhou Drainage Pipe Processing and Casting Factory

Description :

　　Chuzhou Drainage Pipe Processing and Casting Factory

　　In addition to flood prevention and disaster reduction, as well as pollution reduction, the drainage system of the 21st century also includes the resource utilization of sewage, the restoration of a healthy urban water cycle, and a good water environment to achieve sustainable use of water resources. The overview of drainage system refers to the method of collecting and transporting urban sewage and rainwater in a region, which can be roughly divided into combined sewer system and separate sewer system. The former is a system that combines sewage (waste) water and rainwater. The combined sewer system is divided into direct discharge and interception types. The direct discharge type directly collects sewage and discharges it into the water body, while the interception type constructs interception main pipes near the river. At the same time, overflow wells are set up before or at the intersection of the combined and interception main pipes, and sewage treatment plants are set up downstream of the interception main pipes. When the flow rate of mixed sewage exceeds the water carrying capacity of the interception main pipes, some sewage overflows through the overflow wells and is directly discharged into the water body; The diversion system is a system in which sewage (waste) water and rainwater are discharged in two or more pipes and channels, with complete and incomplete diversion. The complete diversion system has sewage drainage system and rainwater drainage systemThe incomplete diversion system has not been built with a rainwater drainage system. There can also be separate systems for sewage and clean wastewater in the diversion system for easy treatment or reuse. The combined sewer system has low cost and easy construction, but it is not conducive to sewage treatment and system management. The cost of the diversion system is relatively high, but it is easy to maintain and beneficial for sewage treatment. Direct flow combined sewer system. The early formation of pipelines in old urban areas both domestically and internationally was a direct discharge combined system, where urban sewage and rainwater were directly discharged into nearby water bodies without any treatment, with low investment and simple management. However, it caused the most serious water pollution and has gradually been abandoned. Cut off combined sewer system. The interception type combined sewer system is generally suitable for the renovation of combined sewer systems in old urban areas and areas with small rainfall, small catchment areas, and receiving water bodies with certain environmental capacity. On the basis of the direct discharge combined sewer system, a river interception main pipe will be constructed, and overflow wells will be set up at appropriate locations. A sewage treatment plant will be built at the end of the interception main pipe (canal). Treating both initial rainwater and dry runoff wastewater is beneficial for protecting water bodies. But when the rainfall is too heavy, the direct discharge of combined sewer overflow sewage (CSO) will cause water pollution. In order to control the discharge of CSO, it is necessary to increase the interception factor, and the interception of CSO causes changes in the load of sewage treatment facilities, affecting the scale, operation management, and effluent quality of sewage treatment plants. In addition, the sewage entering the treatment plant is mixed with a large amount of rainwater, causing significant fluctuations in the quality and quantity of the raw water, which has an impact on the various treatment units of the sewage plant and puts forward higher requirements for the treatment process of the sewage plant. Complete diversion system. There are two separate pipe and channel systems for sewage and rainwater, which are commonly used in large and medium-sized cities as well as new construction areas,

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