the companies or the residents and the sludge could be used as fertilizer or building materials. Can
only use the A2/O craft to guarantee the wastewater processing effectively . T he total wastewater
every year in China reach 36billion,80% of which elimated without efficent processing.It leads
water pollution,the water quality of industry and agriculture decline,the shortage of water resource
and so on.With the environment has became one of the major topic in human life,the A2/O craft is
believed to be developed and used more.
According to the producement requirement,the porportion of the different standing tine is
anaerobic ： anoxia ： aerobiotic =1:1:4,in order to guarantee the vaild cubage five Push flow reaction
pool s with air diffuser s are used.The air demand p er cubic meter of sewage is 11.75m3/m3.The
activated sludge s generated are 400kg/d.The design of other structures includes that primary
settling tank （ available depth 3m 、 pool size 33m ） 、 secondary sedimentation tank （ available
depth 3.3m 、 pool size 43.4m ） use the r adial flow structure to reach t he uniformity of water
distribution .The intermediate grates with 0.04m gride and the fine grates with 0.01m gride are
equiped to isolated from impurities . The transport cost of sludge could be declined at thickening
and dewatering station .The calculating result shows that the removal efficency of BOD 5 reachs up
to 80%,CODcr reachs up to 65%,SS reachs up to 90%,TN reachs up to 60%,TP reachs up to
70%.The opinion that more benefit than cost is established by economic analysis. It is worth
noting that nitrogen and phosphorus removal could not reach the best result at the same
time,which will be reasearched in the future.Of course,some weakness of the topic such as the
process of sludge is simple is existed.
Keywords: Keywords: urban sewage ; process design ; A 2/O
目录目录目录目录
1 1 1 1 绪论 . . . . 1 1 1 1
1.1 污水处理的研究背景现状及发展前景 1
1.2 课题的目的和意义 1
1.3 污水水质净化要求及设计依据 2
1.4 A2/O 工艺特点原理及工艺流程图 . 3
2 2 2 2 设计 . . . . 4 4 4 4
2.1 中格栅 4
2.2 污水提升泵房 7
2.3 细格栅 8
2.4 沉砂池 9
2.5 初沉池 11
2.6 A 2
/O 生化反应池 . 14
2.7 二沉池 18
2.8 接触消毒池 22
3 3 3 3 污水处理系统 . . . . 24242424
3.1 污泥水分去除的意义和方法 24
3.2 污泥浓缩池 24
3.3 污泥脱水系统 26
4 4 4 4 污水处理厂总体布置 . . . . 27272727
4.1 平面布置 27
4.2 高程布置 28
5 5 5 5 经济分析 . . . . 27272727
5.1 成本估算 30
5.2 效益估算 31
致谢 . . . . 3 3 3 3 2 2 2 2
参考文献 . . . . 3 3 3 3 3 3 3 3
1 绪论
1.1 污水处理的研究背景现状以及发展趋势
生活污水是来自家庭 、 机关 、 商业和城市公用设施及城市径流的污水 。 新鲜
的城市污水渐渐陈腐和腐化使溶解氧含量下降 ， 出现厌氧降解反应 ， 产生硫化氢 、
硫醇 、 吲哚和粪臭素 ， 使水具有恶臭 。 生活污水的成分 99% 为水 ， 固体杂质不 到
1% ，大多为无毒物质，其中无机盐有氰化物、硫酸盐、磷酸盐、铵盐、亚硝酸
盐 、 硝酸盐和一些重碳酸墁等 ； 有机物质有纤文素 、 淀粉 、 糖类 、 脂肪 、 蛋白质
和尿素等 ， 另外还有各种洗涤剂和微量金属 ， 后者如锌 、 铜 、 铬 、 锰 、 镍和铅等 ；
生活污水中还含有大量的杂菌 ， 主要为大肠菌群 。 另外生活污水中氮的磷的含量
比较高，主要来源于商业污水、城市地面径流和粪便、洗涤剂等 [1]。 某城市污水A2/O法处理工艺设计+CAD图纸(2):http://www.751com.cn/huaxue/lunwen_15583.html