毕业设计---污水厂工艺设计

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1、 第 1 页 共 92 页 内容摘要内容摘要 为保证污水的有效处理，防止水体的富营养化，避免对环境的污染，在北京市某郊区 县新建第一污水处理厂，该污水处理厂规模为 12 万 m3/d，该污水性质为城市污水，处理 后的水达到国家排放标准 GB18918-2002 后，直接排入该市北部水体。 经调研后，选用 A2/O 工艺，该工艺由厌氧、缺氧和好氧三阶段串联组成，可同时达 到脱氮除磷的目的。该工艺成熟、运行稳定。 污水处理过程中产生的污泥，经气浮浓缩、两级中温消化和机械脱水后用于卫生填埋 或农业施肥。 Abstract In order to effectively deal the sewage

2、,prevent the water from eutrophication and avoid polluting the environment,a wastewater treatment plant with a treatment capability 300000m3/d was planned to design and construct in Huabei district.The character of the sewage is municipal wastewater ， and the effluent which meets the national wastew

3、ater effluent standard (GB18918-2002) was discharged into river which is in the east of the city. Throughout the on-the-spot investigation,I choose the Anaerobic-Anoxic-Oxic technique.This technique is composed of anaerobic、anoxic and oxic in series stages, which is able to meet the purpose of nitro

4、gen and phosphorus removal meantime.This process of the technique is mature and can run steadily. The surplus sludge produced during wastewater treatment condensed by flotation thickener, mesophilic two stage digestion and then treated with mechanical dehydration operation. The dewatering sludge was buried in sanitary fill or was use agriculture fertilizer. 第 2 页 共 92 页 目录目录 1 设计说明书设计说明书 5 1.1 毕业设计任务书 5 1.1.1 设计题目：北京市某郊区县第一污水厂工艺设计 .5 1.1.2 工程概况.5 1.1.3 设计资料.5 1.2 处理厂工艺流程方案选择 6 1.2.1 工艺流程方案的提出