城市生活污水处理工艺的设计

城市污水处理工艺的设计摘要该毕业设计的题目为5万吨/天城市污水处理工程设计，应用的处理工艺为AAO工艺，具有脱氮除磷的效果。进水水质为CODCr=300mg/L，BOD5=250mg/L，SS=200mg/L，TN=30mg/L，TP=6mg/L,pH=7.0~8.5，出水水质为CODCr≤100mg/L，BOD5≤20mg/L，SS≤20mg/L，TN≤15mg/L,TP≤1mg/L，达到污水排放二级标准。根据毕业设计的原始资料及设计要求对出水水质的要求：及要求脱氮除磷，确定A2/O和氧化沟、SBR、AB法污水处理工艺进行设计和经济技术比较。通过投资概算，运行费用的计算，经济比较及技术比较等最总确定A2/O工艺为最佳方案。该污水厂的处理流程为：从粗格栅到泵房到细格栅到沉砂池，进入反应池，进入辐流式二次沉淀池，再进入消毒池，最后出水；从反应池排出的剩余污泥集中输送到污泥浓缩池，由剩余污泥泵直接输送到污泥脱水房脱水，最后外运处置。关键词：A2/O工艺脱氮除磷污水处理AbstractThesubjectofgraduationis5104tons/dayofmunicipalwastewatertreatmentengineeringdesign,ProcesstheapplicationprocessfortheAAO,Hastheeffectofnitrogenandphosphorusremoval.InfluentwaterqualityisCODCr=300mg/L,BOD5=250mg/L,SS=200mg/L,TN=30mg/L,TP=6mg/L,pH=7.0~8.5,EffluentwaterqualityisCODCr≤100mg/L,BOD5≤20mg/L,SS≤20mg/L,TN≤15mg/L,TP≤1mg/L,tosecondareffluentstandards.Accordingtotheprimitivdataofthegraduationprojectanddemandingforwaterquality:CampareA2/Ocraftwithoxidizeditchcraft,SBRcraft,ABcraftandchoosethebetteronefromtwomajorsewagedisposalcraft.Throughthebudgtaryestimatingofinvestment,operatingthecalcuiationoftheexpenses,comparingofconomyandtechnologyect,finallywehavetheA2/Oditchisthebestscheme.Thesewagetreatmentplantprocessis:fromcoarsetofinegridtothegridtopumpgritchamber,Intothereactionpool,Radialflowintothesecondarysedimentationtank,Re-enteringthedisinfectionofpool,Finallyoutflowofwater.Dischargedfromthereactorsludgeconcentrationdeliveredtothesludgethickener.Bythesludgepumpdirectlytothesludgedewateringhousedehydrated,andfinallySinotransdisposal.Keywords:A2/Oprocess,NitrogenandPhosphorusRemoval,SewageTreatment目录引言...................................................................................................................1第一章概述.....................................................................................................21.1设计题目..............................................................................................21.2设计目的..............................................................................................21.3设计要求..............................................................................................21.4设计步骤..............................................................................................2第二章污水处理工艺流程说明.....................................................................32.1气象与水文资料..................................................................................32.2厂区地形..............................................................................................32.3污水处理工艺流程说明......................................................................32.3.1工艺方案分析............................................................................32.3.2工艺流程....................................................................................5第三章工艺流程设计计算.............................................................................63.1设计流量..............................................................................................63.2中格栅的设计计算..............................................................................63.2.1栅条的间隙数n个...................................................................63.2.2栅槽宽度B...............................................................................63.2.3通过格栅的水头损失h1...........................................................73.2.4栅后槽总高度H，m.................................................................83.2.5栅槽总长度L，m....................................................................83.2.6每日栅渣量W，dm3..............................................................83.3细格栅的工艺设计计算......................................................................93.3.1栅条的间隙数n1个.................................................................93.3.2栅槽宽度B..............................................................................93.3.3通过格栅的水头损失h............................................................93.3.4栅后槽总高度H，m...............................................................103.3.5栅槽总长度L，m..................................................................103.3.6每日栅渣量W，dm3............................................................113.4沉砂池设计计算..............................................................................113.4.1曝气沉砂池设计参数.............................................................113.4.2曝气沉砂池的设计计算..........................................................123.5辐流式初沉池的设计计算...............................................................153.5.1沉淀池的水面面积..................................................................153.5.2池径，D，m............................................................................163.5.3沉淀池的有效水深，2h，m..................................................163.5.4沉淀池部分有效容积..............................................................163.5.5沉淀池坡底落差......................................................................163.5.6污泥斗尺寸..............................................................................173.5.7沉淀池的总高度为H，m......................................................173.6OA/2工艺设计计算.....................