环境工程毕业设计书-城市污水处理厂.doc

河南城建学院毕业设计 1 摘要本设计项目所处理的污水主要是由天然气净化厂厂区工业废水和公共建筑用水以及厂区生活用水组成。其混合污水最大日设计流量为 Q= 8000m 3 /d ,总变化系数为 K= , 该厂现有人口 8000 ,随着厂区发展速度的加快,厂区污水的排放严重威胁着该河水质, 为了避免该河水质恶化,该厂拟建一座厂区污水处理厂,以解决生活污水和工业废水的污染问题。设计水质经环保部门监测,污水主要污染物 COD 、 SS 、 BOD 5、 TP 、 TN 以及重金属和有毒物质少量,其污水水质如下: COD=360 mg/l , SS= 200 mg/l , BOD 5 =160 mg/l , PH=6 -9 ,历年最高气温 ℃历年最低气温- ℃,年平均气温 ℃,最高月平均气温 ℃,最低月平均气温 ℃。处理厂处理水质为: BOD 5≤ 1 0mg/l , COD cr≤5 0mg/l , SS ≤1 0mg/l , NH 3 -N≤ 5mg/l , TP ≤ mg/l ,出水水质符合国家的一级排放标准。本设计中,采用 SBR 工艺处理该厂区污水。 SBR 工艺处理污水已有很长的时间,是一种较成熟的工艺,在国内已有很多成功的工程实例。处理构筑物主要有曝气沉砂池、 SBR 反应池、污泥浓缩池等,其主要构筑物 SBR 反应池属于间歇式反应器,本设计的 SBR 反应池建成长方形,有利于减少建设费用。 SBR 工艺占地少,污泥产生量少,抗冲击负荷能力强。通过调节污泥龄能达到同时脱氮除磷的目的,出水水质好。关键词:总变化系数; SBR; 设计流量;脱氮除磷. 河南城建学院毕业设计 2 Abstract The handled waste water is formed mianly by industrial waste gas purification plant area and public building sewage , water and plant position. The biggest day rated discharge of waste water is8000 m 3 / otal c hange s coeff i ciet K =1 .33 . There is8000 person s in the f actory . As plant fying process accelerate s, in order to avoid The river water quality deterioration, a factory plant proposed sewage treatment plant to address sewage and industrial wastewater pollution problems , Design waste water quality is monitored by the department of environmental protection .M ajor contanmint s are CODcr , SS,BOD 5 ,TP,TN,heavy metal and few poisonous material in the waste water,. The waste water quality is as follow: COD=360 mg/l , SS= 200 mg/l , BOD 5 =16 0mg/l , PH=6 -9. The highest temperature ℃ and the minimum temperature is- ℃ over the years , year in average temperature ℃. The highest mean monthly temperature ℃, and the minimum mean monthly temperature ℃.S ewage treatment plant handling water quality is: BOD 5≤ 1 0mg/l , CODcr ≤ 5 0mg/l , SS ≤ 1 0mg/l , NH 3 -N≤ 5mg/l , TP ≤ mg/l . Effluent water quality accords with a level emission standard of country. In the design, the plant sewage is handl ed with SBR