T型氧化沟设计工艺

第1页共66页┊┊┊装┊┊┊订┊┊┊线┊┊┊┊┊┊装┊┊┊订┊┊┊线┊┊┊摘要本设计是关于某市污水处理厂的设计。根据毕业设计的原始资料及设计要求对出水水质的要求:即要求脱氮除磷,出水达到一级排放标准,确定A2/O和三沟式氧化沟等五种污水处理工艺进行工艺设计和经济技术比较。一级处理中,进厂原水首先进入中格栅,用以去除大块污染物,以免其对后续处理单元或工艺管线造成损害。本设计设置中格栅,中格栅后有污水提升泵提升污水进入细格栅。然后进入平流式沉砂池,用以去除密度较大的无机砂粒,提高污泥有机组分的含率。三沟式氧化沟的三沟交替进水，且兼具二沉池的作用。随着曝气器距离的增加,氧化沟内溶解氧浓度不断降低,呈现缺氧区好氧区的交替变化,即相继出现硝化和反硝化的过程,达到脱氮的效果。同时好氧区吸收磷,达到除磷的效果。剩余污泥则经污泥提升泵提升至重力浓缩池。以降低污泥的含水率，减小污泥体积。泥经浓缩后,含水率尚还大,体积仍很大。为了综合利用和最终处置,需对污泥进行脱水处理。在完成污水和污泥处理构筑物的设计计算后,根据平面布置的原则,综合考虑各方面因素进行了污水厂的平面布置。据污水的流量对连接各构筑物的管渠进行了选径、确定流速以及水力坡降,然后进行了水力损失计算。据水力损失计算对污水和污泥高程进行了计算和布置。在最后阶段完成了对平面图、高程图及各种主要的构筑物的绘制。关键词:氧化沟脱氮除磷污水处理污泥浓缩第2页共66页┊┊┊装┊┊┊订┊┊┊线┊┊┊┊┊┊装┊┊┊订┊┊┊线┊┊┊AbstractThisisadesignaboutthesewagetreatmentplantofacity.Accordingtotheprimitivedataofthegraduationprojectanddemandingforwaterquality:Namelyrequirethenitrogenandphosphorusremovaltoreachthefirstclassdischargestandard.Choosethebestonefromfivemajorsewagedisposalcrafts.Inpreliminarytreatments,theoriginalwaterenterscoarsescreeninginordertoremovebulkandfloatablepollutant,incasethatitinfluencestheworkingofthefollowingtreatmentandthepipeline.Andthenwastewaterispromotedintothemediumscreeningbypumpafterthatitentersthelaminarflowsandpool,itisusedtoremovebiggerinorganicsandofheavydensity,bythiswaythedensityoforganicmaterialinmudcanbeimproved.Waterflowsintothreeditchinturn,.Alongwithaerationdistance,thedissolvedoxygendensityreduces.Thismakeoxidizeareaandunoxidizeareapresentinturn.Namelyappearsthenitrationandthecounter-nitrationprocessinsuccession,gettheresultofdenitrogenation.Atthesametimethefineoxygendistrictabsorbsthephosphorus,gettheresultofgettingridofphosphorusThesurplusmudispromotedbythepumpintomudconcentratedpoolinordertoreducethemoisturecontentofthemudandreducethevolumeofmud.afterconcentration,themoisturecontentisstilllarge,thevolumeisthesameinordertocomprehensiveutilizationfinally,weneedtotakeoffwatertreatmenttothemud.Afterfinishingcalculationofdesign,accordingtoprincipleoflaying,considerthefactorssyntheticallytoconfirmtheplaceofthesewagefactory.Accordingtoflowvolumeofsewagewecanselectthefoot-path,confirmthevelocityofflowandwaterconservancyslope,thencalculatewaterconservancylosses.Keyword:OxidationditchPhosphorusSewageandNitrogenSludgetreatmentSludgeConcentrationPool第1页共66页┊┊┊装┊┊┊订┊┊┊线┊┊┊┊┊┊装┊┊┊订┊┊┊线┊┊┊第1页共66页┊┊┊装┊┊┊订┊┊┊线┊┊┊┊┊┊装┊┊┊订┊┊┊线┊┊┊目录第一章概述.............................................................................................................11.1毕业设计任务书...............................................................................................11.1.1设计题目：.............................................................................................11.1.2设计任务：.............................................................................................11.1.3设计要求..............................................................................................21.1.4设计成果................................................................................................21.1.5对设计成果的具体要求........................................................................21.1.6设计时间进度安排..............................................................................3第二章城市污水处理工艺的确定...........................................................................32.1城市污水处理厂的工艺类型..........................................................................32.2城市污水处理工艺应遵循的原则..................................................................32.3城市污水处理厂的工艺选择..........................................................................42.3.1流程比较.................................................................................................42.4.1格栅.........................................................................................................82.4.2提升泵房..............................................................................................92.4.3沉砂池及砂水分离器的选择................................................................92.4.4三沟式氧化沟的工艺流程...................................................................102.4.5接触池...................................................................................................132.4.6加氯间...................................................................................................132.4.7计量设备：...........................................................................................142.4.8浓缩池...................................................................................................152.4.9脱水机房...............................................................................................15第三章城市污水处理系统的设计计算.................................................................153.1流量计算：.....................................................................................................153.2处理程度计算..............................................................................................163.3污水厂处理构筑物设计计算......................................................................163.3.1中格栅...................................................................................................163.3