城市污水处理厂毕业设计(含管网).doc

摘要 关键词 Abstract The total amount of water resources in China is the world,while because of the large population, the per capita water resources is less than 1/4 of the worlds water resources per capita. How to rational development, utilization and protection of water resources, related to the sustainable development of our economy and society. Sewage as a stable and reliable use of renewable water resources, its full development and utilization of effective conservation, development and utilization of water resources is one important means, is the key to solving urban water problems. The graduation project titled is Jilin Qianan preliminary design of sewage treatment works,which is based on a sourcebook and related requirements, preliminary design and planning to expand and drainage management project preliminary design. The main task is to complete the construction drawings of the design of the urban drainage network layout, preliminary design of sewage treatment plants as well as individual processing structures. A manual task is to complete the design, design drawings 15.(Effluent SS concentration of 20mg / L, BOD5 concentration of 20mg / L) of the sewage treatment plant designed according to the degree of processing requirements of national emission standard achieved using Process. Therefore, the main sewage treatment plant structures include: primary treatment structures (mainly grill, pumping station, vortex grit chamber and primary sedimentation tank radial flow, etc.), secondary treatment structures (mainly technology), the follow-up processing structures (including radial flow secondary settling tanks, ultraviolet disinfection canal), as well as rooms and other sludge pumping station, sludge storage tank and sludge dewatering sludge treatment tank. Recently the size of the sewage treatment plant is 70,470m3/d. Sewage treatment process: influent→water pumping station → grid → rotational flow grit chamber → radial flow clarifier → biochemical