毕业设计-某12万吨-城市污水处理厂的A2O工艺设计

Ⅰ某12万吨/日城市污水处理厂的A2/O工艺设计摘要本次毕业设计的题目为某城市污水处理厂工艺的设计-A2/O工艺。主要任务是完成该污水处理厂的平面布置、各个构筑物的初步设计和一些处理构筑物施工图的设计。初步设计要完成设计说明书一份、污水处理厂平面布置图一张、污水处理厂工艺流程图一张以及主要构筑物设计图三张；在主要构筑物设计图的设计中，主要是完成生物池、二沉池和接触消毒池的设计。该污水处理厂工程，规模为12万吨/日。进水水质见下表：污水进水水质单位：mg/L项目CODcrBOD5NH4+-NSSTN0TP0含量27013530135303本次设计所选择的A2/O工艺，具有良好的脱氮除磷功能。该污水厂的污水处理流程为：污水从粗格栅到污水提升泵房，再从泵房到细格栅，然后到旋流沉砂池，再进入生物池（即A2/O反应池），再从生物池进入二沉池，污水再经过接触消毒池后排入自然水体；污泥处理流程为：旋流沉砂池产生的垃圾直接外运处置，二沉池产生的剩余污泥则运入贮泥池，二沉池的回流污泥则通道管道、污泥回流泵房再次进入A2/O反应池，经过贮泥、加药处理后的污泥，进入污泥浓缩脱水车间，最后外运处理。污水处理厂处理后的出水水质要达到《城镇污水处理厂污染物排放标准》（GB18918—2002）中的一级b标准。该标准的具体数据如下表所示：出水水质标准单位：mg/L项目CODcrBOD5NH4+-NSSTN0TP0含量60201520151关键词：A2/O工艺,脱氮除磷,污水处理,污泥处理ⅡTHEA2/OPROCESSDESIGNOFACITYSEWAGETREATMENTPLATEABSTRACTThesubjectofthisgraduationprojectforamunicipalsewagetreatmentplantprocessdesign—A2/Oprocess.Maintaskistocompletethelayoutofthesewagetreatmentplant,thepreliminarydesignofthevariousstructuresandconstructionplansofdealingwiththedesignofstructures.Tocompletethepreliminarydesignofadesignmanual,wastewatertreatmentplantwithafloorplan,flowchartofasewagetreatmentplantandthedesignofthreemainstructures;designofthemaindesignofstructures,mainlyisthebiologicalpool,secondarysedimentationtankdesignandcontactdisinfectiontank.Thissewagetreatmentplantproject,thescaleis120000m3/d.Theinfluentwaterqualityisinthetablebelow.Influentwaterqualityunits:mg/LProjectCODcrBOD5NH4+-NSSTN0TP0Content27013530135303TheselectedA2/Oprocess,hasagoodNitrogenandPhosphorusRemoval.Thissewagetreatmentplantforthesewagetreatmentprocessis:sewagefromthecoarsegridtoenhancethepumpingstation,thenfromthepumptothefinegrid,Andthentothecyclonegritchamber,thenenteringthebiologicalpool(A2/Oreactor),thenfromthepoolintothesecondarysedimentationtank,afterexposuretowaterdisinfectionandthendischargedintothenaturalwater;Sludgetreatmentprocessis:vortexgritchambersludgeintothesludgeⅢdewateringplantdirectly,secondarysettlingtanksludgearealsobroughtintotheworkshop,secondarysedimentationtankproducedreturnedsludgechannelpipes,returnedsludgefromthepumptore-enterA2/Oreactor,aftertreatmentplantsludgedewateringsludge,mudintothestoragepool,thelastisoutwardprocessing.Afterthesewagetreatmentplanteffluentqualitytoachieveurbansewagetreatmentplantemissionstandards(GB18918-2002)inafirstorderandbstandard.Thisstandard'sdataisinthetablebelow.Effluentwaterqualityunits:mg/LProjectCODcrBOD5NH4+-NSSTN0TP0Content60201520151KEYWORDS:A2/Oprocess,NitrogenandPhosphorusremoval,Wastewatertreatment,SludgetreatmentⅣ目录第1章前言..................................................................................................................1§1.1城市污水来源、水量及水质特点分析.................................................................1§1.1.1城市污水来源.................................................................................................1§1.1.2城市污水水量.................................................................................................2§1.1.3城市污水水质特点.........................................................................................2§1.1.4城市污水处理厂进水水质及水量..................................................................2§1.2设计依据...............................................................................................................3§1.2.1法律法规依据.................................................................................................3§1.2.2技术标准及技术规范依据..............................................................................3§1.3设计范围...............................................................................................................3§1.4设计原则...............................................................................................................3§1.5执行排放标准.......................................................................................................4第2章污水处理方案及选择论证...................................................................................5§2.1污水主要处理方法................................................................................................5§2.1.1SBR法............................................................................................................6§2.1.2厌氧池+氧化沟法...........................................................................................6§2.1.3A2/O法............................................................................................................7§2.1.4一体化反应池.................................................................................................7§2.2污水处理方案的选择............................................................................................8第3章污水处理工艺流程设计及原理说明....................................................................9§3.1污水处理工艺流程设计........................................................................................9§3.2工艺原理及工程说明...........................................................................................10§3.2.1格栅...............................................................................................................10§3.2.2旋流沉砂池...........................................................