污水处理厂课程设计 (2)

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1、 *市污水处理厂市污水处理厂 课程设计课程设计 专业：专业： 学号：学号： 姓名：姓名： 指导老师：指导老师： 二一二年七月二一二年七月 / 47 2 摘摘 要要 随着城市的发展，城市人口的激增，城镇规模的扩大，生活污水和工业废水排出量 日益增多，大量未经处理的污水直接排入周围河流，致使城市周围环境污染十分严重。 这不但直接污染了市区的地下饮用水，而且对河流下游地区的农业生产和人民生活造成 了危害，人类和生物赖以生存的生态环境受到了日益严重的威胁。因而城市污水治理已 成当前迫切需要解决的问题之一，而建造污水处理厂可以解决这个问题。 本设计题目为“*市污水处理厂初步设计”。该工程所处理的污水主要

2、是由城市工业 废水和公共建筑用水以及城市生活用水组成。其混合污水近期平均日设计流量为 Q=30000m3 /d,总变化系数为K=1.4进水水质如下：COD=300mg/l , SS=180mg/l， BOD5=1660mg/l，TN=25 mg/l ,TP=2 mg/l，出水水质符合国家的一级B排放标准。 本设计中，采用A2O系统处理该城市污水。处理构筑物主要有旋流沉砂池、A2O系 统、二沉池等，其主要构筑物A2O系统是用来脱氮除磷的，该系统具有厌氧，好氧，缺 氧三个阶段。该系统具有高效，节能的特点，且耐冲击负荷高，出水水质好。 关键词：经济 节能 曝气池 / 47 3 ABSTRACT Wi

3、th the development of cities, the violent increase of the population and the expansion of the city scale, the amount of discharge of city sewage and industrial wastewater is increasing faster and faster. An overwhelmingly large amount of the wastewater is discharged into the waters without disposal,

4、 which makes the urban environment deteriorates seriously. As a result, the ground water of the city is inevitably contaminated and the agriculture and peoples life in the downstream areas are affected, too. The ecological environment is being threatened, which makes one of the priorities to dispose

5、 of the wastewater and sewage. And the establishment of the wastewater treatment plant can tackle the serious issue.Beside，Water resources ensure the sustaining development of economy. Sewage discharged at random or half treated can expose serious pollution to the water resources. This design topic

6、for “YiDouShi sewage treatment plant preliminary design“. The project of sewage is mainly composed of urban industrial wastewater and public buildings and urban life of water with water. Its mix of sewage recent average day for Q = design flow rate of 30000 m3 / d, total change coefficient for K = 1.4 feed water quality as follows: COD = 300 mg/l, SS = 180 mg/l, BOD5 = 1660 mg/l, TN = 25 mg/l, TP = 2 mg/l water-quality and conform to the national level 1 B emissions standards.