文档介绍：本科毕业设计(论文)
辽宁省中部地区C市排水工程设计
摘要
环境污染问题是当今世界上最大的社会问题之一,尤其是水资源的过度开发和不合理利用。合理利用水资源是解决这些问题的关键,因此,水处理的发展对我国能否实现可持续的战略目标起着举足轻重的作用。
本设计是辽宁省中部地区C市的城市排水工程。其由两部分组成,即,城市排水管网系统的设计和城市污水处理厂的设计。其中初步设计要完成设计说明书一份、城市给排水系统总平面图、污水处理厂总平面布置图一张、污水厂污水与污泥处理高程图一张、污水总泵站或中途提升泵站工艺施工图一张,污水与污泥主要构筑物工艺图两张;单项处理构筑物工艺图设计中,主要是完成A2/O反应池的平面图和剖面图。该污水处理厂工程,总规模达到10万吨/日。本设计处理的对象为城市污水,主要污染物质为悬浮固体(SS)及溶解和胶体状态的有机污染物(BOD)。
排水管网系统共设计了A和B两套方案,经过技术经济比较,选择A方案。根据城市所处的地理位置和污水厂的规模,并结合考虑需脱氮除磷的要求,城市污水处理厂设计采用A2/O工艺。该工艺污水处理流程为:从粗格栅到泵房,进入细格栅,沉砂池,初沉池,A
2/O反应池,二沉池,消毒池,电磁流计量,出水排放。污泥处理流程为:从二沉池和初沉池排除的剩余污泥首先进入污泥提升泵房,进入污泥浓缩池,贮泥池,污泥消化池,污泥脱水间,泥饼外运。通过此工艺的处理,出水水质将达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级B标准。
关键词:A2/O;脱氮;除磷;城市排水管网;城市污水处理厂
Abstract
The problem of environmental pollution is nowadays one of the greatest social concerns in the world, especially overexploitation and unreasonable use of the water resource. The water resource of rational utilization is the key to solving these problems。So the development of water treatment plays a decisive role to realize our country the sustainable strategic objective.
The design is a drainage system in a town of C of Liaoning Province. It is made up of two parts, namely, the design of the system of urban drainage works and design of the urban sewage treatment plant. During the preliminary design, we plete a brochure, a map of general layout, an elevation map, a flow chart, a map of major equipment, piping layout; Construction of structures to deal with individual designs, plete anaerobic-anoxic-aerobic tank plants and profiles. The sewage treatment plant project, the total amount to 100,100 tons/day.
A and B two sets of schemes that the system of drainage works has been designed altogether, pare through technological economy, choose A scheme. According to town’s geographical position and scale of sewage treatment plant, combining with the demand of denitrification and dephosphorization in treatment process, the sewage treatment plant designs and adopts A2/O craft. The sewage disposal pro