环境工程工程设计.doc

摘 要 本次工程设计的题目为新建城市污水处理厂设计（6万m3/天） 工艺。主要任务是完成个该地区污水的处理设计。 其中初步设计要完成设计说明书一份、污水处理厂总平面图一张及污水处理厂污水与污泥高程图一张；单项处理构筑物施工图设计中，主要是完成 平面图和剖面图及部分大样图。 该污水处理厂工程，规模为6万吨/日。 A2/O工艺的生物处理部分由厌氧池、缺氧池和好氧池组成。厌氧池主要功能是释放磷,同时部分有机物进行氨化。缺氧池的主要功能是脱氮。好氧池是多功能的,能够去除BOD、硝化和吸收磷。 该污水厂的污水处理流程为：从泵房到沉砂池，进入 反应池，进入辐流式二次沉淀池，再进入清水池，最后出水；污泥的流程为：从 反应池排出的剩余污泥进入集泥配水井，再由污水泵送入浓缩池，再进入消化池，最后进入脱水机房脱水，最后外运处置。 关键词： A2O；同步脱氮除磷；设计说明书  Bstract The topic of this graduate design is about the design of the sewage disposal plant in the area of a City. The technics of the plant is the Anaerobic-Anoxic-Oxic. The main task is the primary design of the plant . The task of the primary design is that a design book、a plan of the plant、the high drawing of the disposal of sludge and sewage ;in the single disposal build design ,the harvest is that the section plane drawing、the plan and some part magnifying drawings of the Anaerobic-Anoxic- Oxic. The construction of this plant is 60000 tones a day. T-oxidize ditch and unoxidize pool are two important part and water flows into three ditchs in turn, also T-oxidize ditch plays the role of secondary settling. The unoxidize pond release phosphorus. Along with aeration distance, the dissolved oxygen density reduces. This make oxidize area and unoxdize area present in ture. Namely appears the nitration and the counter- nitration process in succession , get the result of denitrogenation. At the same time the fine oxygen district absorbs the phosphorus, get the result of getting rid of phosphorus. The process of the sewage in the plant is that: The sewage runs from pump house to sand sinking pond, enters the pond of sedimentation tank, enters disinfection pond, then enters calculation trough ,at last lets out. The process of the sludge is that: Surplus sludge from the sedimentation tank enters concentration pond, enters digestion pond , enters automatically translated text: then enters automatically translated text:, at last it is carried out of the plant. Key words：The Anaerobic-Anoxic