某区排水及CAST工艺计算说明书.doc

某市排水工程和90000吨/天排水工程设计 摘 要 随着社会的进步和科技的发展，我们的生活质量不断提高，与此同时，我们产生的垃圾也越来越难处理，尤其是排放的废水更是造成了水体的大规模污染。本次计主要包括两大部分： 第一部分：某市排水管网初步设计。 城市排水管网采用分流制。污水根据人口密度和人均用水量将城市分为两个大区，每个区域向四周排水，埋设过深时设中途提升泵站，最后汇入城市中间的污水干管流入下游的污水厂；雨水根据径流系数和暴雨强度公式计算流量，重现期取一年，就近排入水体，沿等高线布置。 第二部分：城市污水处理厂的设计 根据进出水水质，初步选择CAST和AAO两种处理方式，均使用潜污泵房和紫外消毒法，其他构筑物按二者的工艺流程的需求建造。经过一系列的比较，最终选择CAST作为这次设计的工艺。CASAT工艺即循环活性污泥法，具有投资小，除磷效率高，自动化高等优点。 关键词 排水管网；雨水管网；AAO工艺；CAST工艺 INTRODUCTION Abstract With the development of society and the progress of the science and technology as our quality of life continues to increase. At the same time, we generated garbage is also more difficult to deal with, especially wastewater discharge is caused large-scale pollution of water body. This time includes two major parts: The first part: the preliminary design of a city drainage pipe network. Diversion system of urban drainage pipe network. Sewage according to the population density and per capita water divides the city into two regions, each region to the surrounding drainage, buried too deep is located halfway to upgrade pumping stations, before emptying into the middle of the city sewage dry pipe into the downstream of the sewage plant; rainwater according to the runoff coefficient and the formula of storm intensity meter to calculate the discharge, return period from a year, the nearest discharged into the water body and arranged along the contour. The second part: the design of urban sewage treatment plant According to the water out of the water, the initial choice of cast and AAO handled in two ways, are the use of submersible sewage pump and ultraviolet disinfection method and other structures constructed according to the demand of process. After a series of comparison, the final choice of CAST as the design of the process. CASAT process, which is cyclic activated sludge process, has the advantages of small investment, high phosphorus removal efficiency, high automation and so on. Keywords drainage system; rainwater network;CAST technol