1、I 摘摘 要要 本次设计的题目某城市污水处理厂工艺设计，设计流量为 15 万 m 3/d,进水水 质为 BOD5=200mg/L，CODcr=450mg/L，SS=370mg/L，氨氮=15。出水水质： CODcr63mg/L；BOD514 mg/L；SS30 mg/L；氨氮3 mg/L。设计要求出水水质 满足中华人民共和国污水综合排放标准(GB89781996)二级标准。 采用氧化钩法处理该城市污水，氧化沟处理技术 70 年代末就在国内开始应 用，在污水处理中取得了良好的效果。氧化沟是活性污泥法的一种改型，其曝气 池呈封闭的沟渠型，污水和活性污泥的混合液在其中进行不断的循环流动，氧化 沟通常
2、在延时曝气条件下进行污水处理，这时水力停留时间长(1040h)，有机负 荷低0.050.15kg BOD5/(kg VSSd)。与其他生物处理工与艺相比,有以下一些 技术、经济方面的特点：工艺流程简单，构筑物少，运行管理方便；曝气设备和 构造形式的多样化、运行灵活；处理效果稳定、出水水质好并可以实现脱氮除磷。 关键词关键词：城市污水，氧化沟，活性污泥法 II Abstract The design for the title of the city sewage treatment plant process design, design flow for the 150 ,000 m3 /
3、d, water quality for BOD5 is200mg / L, CODcr is 450mg / L, SS is 370mg / L, Ammonia is15. Effluent quality for BOD5 is less than 14mg / L, COD is less than 63mg / L, SS is less than 30 mg / L, Ammonia is less than 3mg / L. The drainage water should meet the two criteria water requirements of GB8978-
4、1996 wastewater discharge standards. By the oxidation ditch treatment of urban sewage， oxidation ditch technology was applied in our country about 70s, and had good effect in treating waste water. Oxidation ditch is a remodel of active mud method, its plug flow aeration assuming obturate ditch type,
5、 the mixed liquid of waste water and active mud flowing in circle. Oxidation ditch usually treats waste water in delay plug flow condition, the waterpower has long settle time (1040h), low organic loading 0.050.15kg BOD5/(kg VSSd). comparing with other biology treat technology, such as: simple proce
6、ss, little building, convenient to administering, its equipment and structure diversification, stabilization effect, and has good water quality, can pull off the nitrogen. Keywords : Urban Sewage, Oxidation ditch,Live and dirty mire method 1 目录目录 摘摘 要要 I I ABSTRACTABSTRACT IIII 目录目录 1 1 第一章第一章 绪论绪论 4 4 1.1 设计任务 . 4 1.1.1 设计题目 . 4 1.1.2 设计任务与内容 . 4 1.1.3 基本要求 . 4 1.1.4 设计计算说明书的具体要求 5 1.2 设计原始资料及处理目标 5 1.2.1 进水水质资料 . 5 1.2.2 气候资料 . 5 1.2.3 处理目标 . 6 1.2.4 处理效果的估算 . 6 1.3
