环境工程学污水处理过程课程设计.doc

PAGE PAGE 25 目录 1 总论 ··········································································1 1.1 设计任务和内容 ·······················································1 1.2 基本资料 ································································1 2 污水处理厂工艺流程 ·······················································2 2.1城市污水处理工艺选择的原则 ··········································2 2.2 污水处理厂的工艺的选择 ···············································4 2.3污水处理厂的工艺流程图 ················································8 3 处理构筑物设计······························································8 3.1 格栅设计··································································8 3.2 沉砂池设计······························································10 3.3 氧化沟设计······························································12 3.4 二沉池设计······························································17 3.5 接触消毒池设计·························································19 4主要设备说明·································································21 5 污水厂总体布置····························································21 5.1 污水厂平面布置·························································21 5.2污水厂高程布置···························································22 6.参考文献 ·····································································24 7.致谢 ··········································································25 1 总论 1.1 设计任务和内容 （1）设计任务： a.初始条件：CODCr ：400mg/L， BOD5: 240 mg/L, SS: 310 mg/L,NH4+-N：32 mg/L , T-P：5mg/L, pH值：9的生活污水，流量为4万吨/天。 b.处理要求:出水达到《污水综合排放标准》（GB8978－1996）一级排放标准，如下表：表1出水水质标准 （2）设计内容 ① 对工艺构筑物选型作说明； ② 主要处理设施（格栅 、沉砂池、初沉池、曝气池、二沉池）的工艺计算； ③污水处理厂平面和高程布置。 1.2 基本资料 污水处理所用的方法是基于物理、化学、物理化学、生物等原理的基础上发展起来的。物理方法主要包括有:过滤、离心、沉淀和上浮。化学方法主要包括有:混凝、中和、化学沉淀和氧化还原。物理化学方法主要包括有:吸附、离子交换、萃取和膜析。生物方法主要包括有:好氧、兼性和厌氧生物处理。中小城镇污水主要是生活污水，一般其水质为COD500mg/L，pH==6.5一7.5，BODS(250mg/L，55500mg/L，色度(稀释倍数法)100，含有一定量的氮和磷，且水质水量的波动较大，可生化性好。 污水二级生化处理工艺发展较快，如活性污泥法发展出了AB工艺、A/0工艺、A2/O工艺、UCT工艺、氧化