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日处理10万吨的城市污水厂设计+文献综述(3)

时间:2018-04-05 20:51来源:毕业论文
Grit chamber : As aeration wastewater organic particles in suspension frequently , and subjected to rubbing sand aeration shear force , organic contaminants adhered to the sand grains can be removed t


Grit chamber : As aeration wastewater organic particles in suspension frequently , and subjected to rubbing sand aeration shear force , organic contaminants adhered to the sand grains can be removed to facilitate access to the more pure the sand . The centrifugal force of the swirling flow , the larger the density of the sand thrown to the outside of the sand sunk groove set , the smaller the density of organic matter with the water flow is brought forward to the next processing unit . In addition, water aeration can be deodorized , improve water quality, conducive to subsequent treatment , can also play a role in pre-aeration .
Three oxidation ditch : This process is simple , without a separate primary, secondary sedimentation tank and sludge reflux device , the oxidation ditch process of infrastructure investment and operating costs greatly reduced , and to some extent solves the oxidation ditch covers big drawback , of Handan City East Sewage Treatment Plant is used in this process .
Sludge thickener : to sewage sludge as the main sludge concentration is high and the gap in the water cannot be discharged, perishable gas precipitation concentrated sludge sedimentation .
After treatment of this process , the effluent quality achieves "urban sewage treatment plant pollutant discharge standard " (GB 18918-2002) in the two standards.
Key words:  Three oxidation ditch; municipal sewage; effluent standards
 
目 录
1 绪论.1
 1.1 背景介绍.1
 1.2 设计介绍.1
 1.3 设计依据.2
2 方案论证.3
 2.1 确定方案的原则.3
 2.2 方案的比较.3
  2.2.1 AO工艺3
  2.2.2 A2O工艺4
  2.2.3 AB法4
  2.2.4 SBR法.5
 2.3 方案选择.6
3 工艺设计与计算.8
 3.1 中格栅.8
 3.2 泵房10
 3.3 细格栅11
 3.4 曝气沉砂池13
 3.5 三沟式氧化沟15
 3.6 接触消毒池21
 3.7 浓缩池22
 3.8 贮泥池23
 4 污水厂布置.24
 4.1 厂址选择24
 4.2 污水厂平面布置24
  4.2.1 构筑物布置.25
 4.3 污水厂高程布置25
  4.3.1 高程布置注意事项.25
  4.3.2 高程计算.25
5 经济预算与运行管理28
 5.1 估算依据28
 5.2 经济预算28
  5.2.1 工程造价预算.28
  5.2.2 污水处理成本计算.29
 5.3 运行管理30
6 结论与建议31
 6.1 结论31
 6.2 建议31
致谢32
参考文献33
1 绪论
1.1 背景介绍
世界上每一个国家的经济发展,都伴随着人民生活水平的改善和城市化进程的不断加快。但是在经济高速发展的背后,相应的淡水资源的需求和消耗也在不断增多。水,,长期以来一直被人们认为是取之不尽、用之不竭的一种资源。在这种观点的驱使下,现在的水环境越来越恶劣、水资源短缺也越来越严重。这些都加重了城市的负荷,带来了一系列危及人类生存与城市发展的生态环境问题。
根据水利部门的预测,到2030年我国人口増至16亿时,人均水资源将会降低到1760立方米,总缺水量将达到400~500亿立方米,已经达到了世界公认的缺水警戒线。从地区分布情况来看,水资源总量的81%集中分布于长江及其以南地区,其中40%以上又集中于西南五省区,就人均占有淡水资源而言,南方最高地区和北方最低地区相差数十倍,西部比东部甚至高出五、优尔百倍。这些数据告诉我们:水资源短缺的现状将在一个相当长的时间成为难以解决的问题。
目前全国年排污量约为350亿立方米,但城市污水集中处理率仅为15%,全国超过80%的城市污水未经任何有效的收集处理就直接排放到附近的水体,使得原本具有泄洪和美化景观作用的河渠变成了天然污水渠,就像曾经的苏州河一样。特别是在全国2200座县城与19200个建制镇中,污水排放量约占污水排放总量的一半以上,但这些中小城市(镇)的污水处理能力都明显低于全国平均水平。 日处理10万吨的城市污水厂设计+文献综述(3):http://www.youerw.com/huaxue/lunwen_12432.html
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