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1、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+-NSSTNTP0含量27013530135303本次设计所选择的A2/O工艺,具有良好的
2、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CO
3、DcrBOD5NH4+-NSSTN0TP0含量60201520151关键词:A2/O工艺,脱氮除磷,污水处理,污泥处理ⅠTHEA2/OPROCESSDESIGNOFACITYSEWAGETREATMENTPLATEABSTRACTThesubjectofthisgraduationprojectforamunicipalsewagetreatmentplantprocessdesign—A2/Oprocess.Maintaskistocompletethelayoutofthesewagetreatmentplant,thepreliminarydesignoftheva
4、riousstructuresandconstructionplansofdealingwiththedesignofstructures.Tocompletethepreliminarydesignofadesignmanual,wastewatertreatmentplantwithafloorplan,flowchartofasewagetreatmentplantandthedesignofthreemainstructures;designofthemaindesignofstructures,mainlyisthebiologicalpool,secondar
5、ysedimentationtankdesignandcontactdisinfectiontank.Thissewagetreatmentplantproject,thescaleis120000m3/d.Theinfluentwaterqualityisinthetablebelow.Influentwaterqualityunits:mg/LProjectCODcrBOD5NH4+-NSSTN0TP0Content27013530135303TheselectedA2/Oprocess,hasagoodNitrogenandPhosphorusRemoval.Thi
6、ssewagetreatmentplantforthesewagetreatmentprocessis:sewagefromthecoarsegridtoenhancethepumpingstation,thenfromthepumptothefinegrid,Andthentothecyclonegritchamber,thenenteringthebiologicalpool(A2/Oreactor),thenfromthepoolintothesecondarysedimentationtank,afterexposuretowaterdisinfectionand
7、thendischargedintothenaturalwater;Sludgetreatmentprocessis:vortexgritchambersludgeintothesludgeⅡdewateringplantdirectly,secondarysettlingtanksludgearealsobroughtintotheworkshop,secondarysedimentationtankproducedreturnedsludgechannelpipes,returnedsludgefromthepumptor