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环境污水处理毕业论文 某城镇污水处理厂工艺设计
摘 要
本次设计所处理的对象是某城镇的城镇污水。
本次设计总水量为45000m3d;COD〈450mgL;BOD5〈290mgL;SS〈250mgL;PH=6~9;TN〈45 mgL;TP〈4.0 mgL;NH3-N<30。通过一定合适的工艺处理后达到城镇污水处理厂一级A排放标准,即COD≤50mgL;BOD5≤10mgL;SS≤10mgL;PH=6~9;TN≤15 mgL;TP≤0.5 mgL ;NH3-N≤5。通过查阅一定的参考资料,并在导师的精心指导下,决定采用氧化沟工艺作为本次设计的处理方案。在处理过程中,最终使之达标排放。
确定工艺流程后,根据本设计处理规模45000m3d,再对各个水处理构筑物进行了选型及工艺参数的取值。
论文中对整个废水处理工艺的选型作了详细的论述和说明;在设计计算说明书中对各个处理构筑物进行了必要的工艺计算。
通过对本方案在处理效果和经济效果上的分析比较,可以得出该方案使可行的。
设计成果包括毕业设计论文和设计计算说明书各一份,设计图纸10
I 张。
关键词 城镇污水;氧化沟工艺;脱氮除磷
Some cities sewage treatment plant project
technological design
Abstract
The object of this design is domestic water.
The total capacity of water is 45000m3d; chemical oxygen demand (COD)<450mgL;biological oxygen demand (BOD5)〈290mgL;suspend solid (SS)〈250mgL;PH=6~9;total nitrogen (TN)〈45 mgL;total phosphate (TP)〈4.0 mgL;ammonia-nitrogen(NH3-N)<30.By the way of some propel treatment ,then can achieve the discharge A standarad of domestic water :
II COD≤50mgL; BOD5≤10mgL; SS≤10mgL; PH=6~9; TN≤15 mgL; TP≤0.5mgL ;ammonia-nitrogen(NH3-N) ≤5.I consulted many literature and with the decided to adopt oxidation ditch process for my treatment plan. According to my treatment ,the effluent can achieve the standard .
I chose the kind ofconstruc building and parameter of provision based on the determined treatment scale .
I of all the technology course ,and there?s an essential technology calculate in the instruction .
Compared with economic and the effect of treatment ,I can :my treatment technology is feasible .
Our achievement contains the instruction of calculate and 10 piece of drawiong .
Keywords domestic water;oxidation ditch process ; rmoval of nitrogen and phosphorus
目 录
1 绪 论 .......................................................... 1 2 工程概况 ....................................................... 2 2.1 设计资料 ..................................................... 2 2.2 设计依据 ..................................................... 2 3 原水水量、水质及达标要求 ........................................ 3 3.1 水量确定 ..................................................... 3
III 3.2 水质确定及达标要求 ........................................... 3 3.2.1 进水水质 ................................................. 3 3.2.2 出水水质 ................................................. 4 4 污水处理工艺方案比较和选定 ...................................... 5 4.1污水处理厂设计原则 ........................................... 5 4.2 工艺流程选定依据 ............................................. 5 4.3 工艺方案比较 ................................................. 6 4.3.1 技术比较 ................................................. 6 4.3.2 主要构筑物的比较 ......................................... 9 4.3.3 经济比较 ................................................ 10 4.3.4 方案确定 ................................................ 11 4.3.5工艺流程确定 ............................................. 11 5 污水处理厂主要构筑物工艺设计计算 ............................... 12 5.1 泵前中格栅 .................................................. 12 5.2 泵房 ........................................................ 13 5.3 细格栅 ...................................................... 14 5.4 旋流沉砂池 .................................................. 15 5.5 厌氧池 ...................................................... 16 5.6 氧化沟 ...................................................... 17 5.7 二沉池 ...................................................... 22 5.8 混凝反应池 .................................................. 24 5.9 平流式沉淀池 ................................................ 26 5.10 滤池 ....................................................... 29 5.11 接触消毒池 ................................................. 29
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