环境工程专业(论文).doc

本次毕业设计的题目为大连市某污水处理厂工艺设计——倒置AAO工艺。设计主要任务是根据该市污水性质、排污规模的要求完成污水处理厂初步设计和单项处理构筑物设计。 其中污水处理厂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；单项处理构筑物设计中，主要是完成主体处理构筑物平面图及剖面图及部分大图样。 该污水处理厂工程，规模为7万吨/日。 该污水处理厂的污水处理流程为：污水由市政排水管网经格栅由泵房提升进入到涡流沉砂池，进入倒置AAO反应池，进入辐流式二沉池，进入接触池，最后出水；污泥的流程为：从二次沉淀池池排出的剩余污泥进入回流污泥泵房，再由污水泵送入浓缩池，再进入储泥池，由浓缩污泥泵房提升送入污泥脱水间，最后泥饼外运处置。 污水处理厂处理后的出水优于国家污水综合排放标准（GB)中的二级标准。 所选择的倒置AAO工艺，具有良好的脱氮除磷功能。 关键词：倒置AAO工艺，脱氮除磷 ABSTRACT The topic of this graduate design is about the design of the sewage treatment plant in the development area of economy and techonology in Da lian City. The technics of the plant is the inverted AAO process. The main task is the primary design of the plant and the shop drawing of the oxidation ditch pond. The task of the primary design is that a design book、a plan of the plant、the high drawing of the 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 inverted AAO process. The construction of this plant is 70000 ton per day. 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 pong, then it is dehydrated, at last it is carried out of the plant. The outlet water of the plant meets the level two of the National Sewage Discharge Standard (GB8978-1996). There is an inverted AAO process prevents sludge from eapending, promots releasing phosphorus ,and strengthens anti-nitration. Key words：The inverted AAO process Taking off the nitrogen and the phosphorus 目 录 摘 要 I ABSTRACT II 前 言 1 第一部分 设计说明书 2 第一章 设计概论 2 1.1 设计任务 2 1.2 设计目的 2 1.3 设计要求 2 1.4 设计数据及材料 3 1.5 处理程度的计算 4 第二章 总体设计 5 2.1 工艺比较选择 5 2.2 主要生产构筑物工艺设计 16 2.2.1 格栅间 16 2.2.2 污水提升泵房 16 2.2.3 沉砂池 16 2.2.4 倒置AAO池 17 2.2.5 鼓风