改良氧化沟工艺--毕业设计

12013届毕业生毕业设计题目:某县5.0万吨/天生活污水厂设计（改良氧化沟工艺）院系名称：化学学院专业班级：学生姓名：学号：指导教师：教师职称：教授2013年05月18日I摘要在我国目前的技术、经济条件下，氧化沟污水处理技术被认为是出水水质好、运行可靠的污水生物处理方法，特别是其封闭循环式的池型较适用于污水的除磷脱氮。对于中小城市及乡镇采用氧化沟处理污水来说，其建设速度快、投资省、管理方便等优点，使得能收到很好的预期效果。日处理量为5.0万吨的小型污水处理厂，采用改良氧化沟工艺，以改进型四沟式氧化沟和曝气生物滤池为核心处理构筑物。污水通过管道进入提升泵房、经细格栅后进入厌氧池+氧化后的生物反应池中，在氧化沟内与回流污泥在厌氧池内混合，进行磷的释放，然后进入改进型的四沟式氧化沟，出来的清水进入气水反冲洗滤池中进行深度处理，最后经紫外线消毒后出水。四沟式氧化沟采用边沟排泥，这样既有利于除磷，又有利于后续的污泥处理；通过工程实践，根据氧化沟工艺设计和应用中存在的缺点和问题，提出氧化沟处理生活污水和工业废水的完善措施和发展趋势。关键词：改进型四沟式氧化沟；曝气生物滤池；脱氮除磷；IITitle50,000t/dsewageplantdesignbasedonimprovedoxidationditchprocessforacountyAbstractInourcurrenttechnology,economicconditions,theoxidationditchwastewatertreatmenttechnologyisconsideredthewaterqualityisgood,reliableoperationofbiologicalwastewatertreatmentmethods,Especiallyitsclosedcircularpooltypeismoresuitableforphosphorusandnitrogenremovalofsewage.Oxidationditchsewagetreatmentforsmallandmedium-sizedcitiesandtowns,thespeedofitsconstruction,investment,managementandeasy,soexpectedtoreceivegoodeffect.Dailyprocessingcapacityof50,000tonsofsmallsewagetreatmentplants,improvedoxidationditchprocess,improvedfouroxidationditchandBiologicalAeratedFilterasthecoreprocessingstructures.Sewagethroughapipeintotheupgradingpumpingstations,intotheanaerobictankthroughfinegrid+oxidizedbiologicalreactionvessel,intheoxidationditchandthereturnsludgeintheanaerobictanksmixedphosphorusrelease,andthenentertheImprovedthefouroxidationditch,outoftheclearwaterintothegas-waterbackwashfilterdepthprocessing,thefinaleffluentafterUVdisinfection.ThefouroxidationditchDitchmud,bothforphosphorusremoval,butalsoconducivetosubsequentsludgetreatment;engineeringpractice,accordingtotheshortcomingsandproblemsthatexistintheoxidationditchprocessdesignandapplication,oxidationditchtreatmentlifesewageandindustrialwastewaterperfectmeasuresandtrends.Keywords：Improvedfouroxidationditch；BiologicalAeratedFilter；Nitrogenandphosphorusremoval.III目录1.绪论....................................................................................................错误！未定义书签。1.1氧化沟的基本概念、原理和技术发展................................................................11.1.1氧化沟的基本概念和原理.........................................................................11.1.2氧化沟技术的演变及发展.........................................................................21.2氧化沟脱氮除磷的矛盾关系及某些解决方法....................................................31.2.1污泥泥龄.....................................................................................................31.2.2碳源.............................................................................................................31.2.3硝酸盐.........................................................................................................41.2.4系统的硝化和反硝化容量问题.................................................................41.3氧化沟的曝气和混合推动设备............................................................................41.3.1曝气设备.....................................................................................................41.3.2水下推进设备.............................................................................................51.3.3氧化沟曝气设备选型及设计关键...............................错误！未定义书签。1.4四沟式氧化沟工艺原理及特点............................................................................61.4.1工艺原理.....................................................................................................61.4.2四沟式氧化沟工艺特点.............................................................................62.设计说明书......................................................................................................................72.1污水处理厂设计规模............................................................................................72.2进水水质及出水所需达到的目标........................................................................72.3流程说明................................................................................................................72.3.1格栅.............................................................................................................82.3.2进水泵房.....................................................................................................92.3.3旋流沉砂池.................................................................................................92.3.4厌氧混合池与氧化沟...............................................................................112.3.5二级提升泵房及废水调节池...................................................................132.3.6气水反冲洗滤池与清水池.......................................................................132.3.7消毒池.......................................................................................................152.3.8加药间.......................................................................................................152.3.9污泥储泥池...............................................................................................152.3.10污泥浓缩脱水机房.................................................................................153.设计计算书...................................................................