毕业设计说明书 XX市排水工程规划及污水厂设计.doc

摘 要 在今日的中国，随着经济的飞速发展，城市公共环境的污染问题困扰着我们，而其中水污染问题更是越来越严重。 本次设计是关于XX市的排水工程。此项工程包括三个部分：城市的排水以及收集工程，和污水处理厂的设计。 城市被一条铁路分成两部分，同时本区还有三个工厂。在城市的西南部有一条流动的河，本市的纵向高差是15米。我们在布置管网要利用地形地势，以便减少管底的埋藏深度，这样做的目的是为了节约投资。该市的冰冻深度是0米，地下水位是6米。此设计的排水体系需要收集城市的生活污水、工业废水以及雨水三部分。排水体制采用分流制体系，这样在造价上比合流制要高一些，但是从处理的难易程度和效果上来说，分流制要比合流制简单而更有效。 根据实际情况，污水厂建在城市的西南角，常年主风向是东北风，因此不会造成城市的环境问题。污水厂的水处理分为两步：一级处理，二级处理。其中二级处理最为重要，它采用了活性污泥法处理污水。大部分情况下，经二级处理的水已达到排放的标准，属于可以直接排放到工厂附近的水体，而不会给环境带来严重的问题。而污泥经过消化、浓缩，产生的沼气可以做为再生能源利用。 关键词： 环境；排水工程；污水处理；污泥处理 Abstract Nowadays in China with the fast development of the economics, the public increasingly focus on the growing serious problem of the environment surrounding us, of which the phenomenon of water pollution been more and more serious. This design is mainly about the dranige engineering of city XX in Liaoning Province, including three parts: the design of sewerage engineering and the design of the collection system of rainfall, and the design of a wastewater treatment plant. There are two parts in this city with a railway through it, and there are three factories in the district. A river lays in the Southwest of the city and there are fifteen meters between the head and the end in height, and so the pipe net is layouted along with the topography to decrease the depth of the bottom of pipe to save money. This market icy profundity is 0 meters, 6 meters of water tables. This design of the sewage system of this city should collect domestic wastewater, industry wastewater and storm.The sewage system is separate system, it is more expensive in drains but the sewage treatment is easier and more effective. According to the actual conditions, sewage factory wind direction is the northeast throughout the year in this city, so it will not influence the environmental question of the city. The wastewater treatment system is divided into primary and secondary subsystems. The secondary subsystems is the most important, it adapts the active mud to deal with the law and deal with the