文成县城市污水处理厂初步设计.doc

洛阳理工学院毕业设计 I 文成县城市污水处理厂初步设计摘要本设计的题目是“文成县城市污水处理厂初步设计”从给定的设计资料得知文成县设计人口20万,日排放污水5万吨,其中生活污水占60% ,工业废水占40% 。污水处理厂的设计处理量按远期目标日处理 10万吨设计。污水处理厂的出水水质参考国家规定的城镇污水处理厂排放污染物的标准中的一级 A 类排放标准。设计水质经环保部门监测得知污废水主要污染物 5 BOD 、 cr COD 、 TP 、 SS 、 TN 以及重金属和少量有毒物质。为达到出水标准, 本设计所采用的处理工艺为改良型 A2/O 法,即 A+A2/O 法, 此法对 TP 、 TN 的去除率很高,能满足出水要求。本设计中主要构筑物有格栅、旋流沉砂池、 A+A2/O 生物池、二沉池+ 高效沉淀池、接触消毒池、及回流污泥泵房等一些辅助建筑物。其中主要构筑物 A+A2/O 生物池是标准 A2/O 生物池前加设预缺氧池,各种实验以及实践结果表明,前置预缺氧池能够强化脱氮。此外,系统中 TP 去除率达到90% 以上, 表示其加入的预缺氧池能够有效的促进厌氧池的厌氧释磷,提高去除率。关键词: 污水处理厂,改良型 A2/O 法,预缺氧池, TP 洛阳理工学院毕业设计 II ABSTRACT This design topic is "Wencheng County of city sewage treatment plant preliminary design"Learned from the data given : The design ofa population of200000, Wencheng County, emissions of50000 tons of sewage, sewage accounted for 60%, accounting for 40% of industrial wastewater. Moreover, the design capacity of sewage treatment plant according to the long-term goal of the daily processing 100000 tons of design. A class a discharge standard of sewage treatment plant effluent quality reference state of the urban sewage treatment plant pollutant discharge standard. Design of water quality monitoring by the environmental protection department learned that the main pollutants ofwastewater BOD, COD, TP, SS, TN and a small amount of heavy metals and toxic substances. In order to reach the effluent standard, which are used in the design process of the improved A2/O method,A+A2/O method, The method of TP, the removal rate of TN is very high, can meet the requirements of effluent. The design of the main structures of grid, grit chamber, A+A2/O biological pond, two sink the pond + efficientsedimentation tank, contact disinfection tank, sludge pump and some other auxiliary buildings. The main structures of A+A2/O biological pond is the standard of A2/O biological pond before adding pre hypoxiapool, A variety of experimental and practical results, pre anoxic tank can be enhanced nitrogen removal. In addition, the system TP removal rate reached