某城镇污水处理厂初步设计

扬州职业大学毕业设计I摘要污水处理厂处理规模为近期3.0万m³/d，远期6.0万m³/d，设计进水水质为：悬浮物（SS）：30mg/L；五日生化需氧量（BOD5）：30mg/L；化学需氧量（CODcr）：100mg/L；出水水质达到《城镇污水处理厂污染物排放标准》（GB18918-2002）二级标准，拟定出水水质指标为：CODCr：≤100mg/L；BOD5≤30mg/L；SS≤30mg/L；NH3-N≤10mg/L。设计进水水质氮含量较高，因此在设计处理工艺是还需要考虑脱氮除磷技术，由于污水厂规模较小，污水日变化量较大，因此，在设计过程中选择适应该情况的氧化沟工艺。在氧化沟前添加厌氧池，以提高除磷效果。实现出水水质达标且稳定的目的。本次设计的主要构筑物包括集水井、粗格栅、泵房、细格栅、曝气沉砂池、carrousel氧化沟、辐流式二沉池、配水井、污泥浓缩池、污泥脱水车间等。市政污水管网收集的污水经中格栅拦截较大的悬浮物和漂浮物后，由污水泵房提升至细格池去除比重较大的无机颗粒，通过氧化沟，以去除大量的有机物，同时达到脱氮除磷的效果。处理后的污水在辐流式二沉池内进行泥水分离，再经过V型滤池进一步去除SS，后经消毒后排放。污泥回流比为100%，其余的由污泥脱水机房浓缩脱水后外运。本次设计污水厂占地10.09km2。设计中省略了初次沉淀池，节省了基建和运行费用。氧化沟表面曝气设备简单，管理方便，且出水较为稳定，做到了水资源的合理利用。关键词：污水处理、carrousel氧化沟工艺、脱氮除磷扬州职业大学毕业设计IAbstractSewagetreatmentplantscaleoftherecent30000m³/d,forward60000m³/d,thedesignwaterqualityare:suspendedsolids(theSS)：30mg/L；5,biochemicaloxygendemand(ofBOD5):30mg/L；chemicaloxygendemand(CODcr):100mg/L；twostandardsofwaterqualityofurbansewagetreatmentplantemissionstandards(GB18918-2002),developmentofwaterqualityindicators:ofCODCr:≤100mg/L；ofBOD5≤30mg/L；SS≤30mg/L；ofNH3-N≤10mg/LDesignhighwaterqualitynitrogencontentinthedesignoftreatmentprocessesisalsoneedtoconsidernitrogenandphosphorusremovaltechnology,thesmallerwastewatertreatmentplant,sewagelargervariationinthedesignprocesstoadapttothesituationoftheoxidationditchprocess.Addedbeforetheoxidationditchanaerobictanktoimprovephosphorusremoval.Achievethepurposeofwaterqualitystandardsandstable.Thedesignofthemainstructures,includingthesetofwells,thecoarsegrid,pumpingstations,thefinegrid,aeratedgritchamber,carrouseloxidationditch,theradialflowsedimentationtank,withwells,sludgethickener,sludgedewateringworkshopandsoon.Grilleinterceptlargersuspendedsolidsandfloatingdebrisinthesewagethathasbeencollectedbythemunicipalsewernetwork,upgradethesewagepumpingstationtothefinegridpooltoremovealargeproportionofinorganicparticlestoremovealotoforganicmatterthroughoxidationditch,achievetheeffectofnitrogenandphosphorusremoval.Treatedsewagemudinthesecondarysettlingtanksradialflowseparation,andthenaftertheVfilterforfurtherremovalofSSemissionsafterdisinfection.Sludgereturnratioof100%,therestofthesludgedewateringmachineroomdewateringSinotrans.Thedesignofwastewatertreatmentplantcoversanareaof10.09km2.Omittedfromtheinitialsedimentationtanksinthedesign,infrastructureandoperatingcostssavings.Oxidationditchsurfaceaerationequipmentissimple,easymanagement,andwaterismorestable,sothatareasonableuseofwaterresources.Keywords：sewagetreatment,carrousel2000oxidationditchprocess,nitrogenandphosphorusremoval.某城镇污水处理厂初步设计II目录第一篇设计说明书.....................................................................................................................11概述..............................................................................................................................................11.1设计任务...............................................................................................................................11.2设计依据...............................................................................................................................11.2.1规范标准........................................................................................................................11.2.2参考文献........................................................................................................................11.3区域概况...............................................................................................................................11.3.1自然条件........................................................................................................................11.3.2城市污水排放现状........................................................................................................22污水处理厂的设计......................................................................................................................22.1规模与处理程度的确定.......................................................................................................22.1.1污水处理厂规模与处理目标........................................................................................22.1.2设计进出水水质............................................................................................................22.1.3污水处理程度确定.......................................................................................................32.2污水处理厂方案的确定......................................................................................................32.2.1确定污水处理方案的原则...........................................................................................32.2.2污水处理方案的比选....................................................................................................32.2.3设计方案的确定............................................................................................................62.2.4工艺流程确定................................................................................................................62.3污水处理厂工艺设计...........................................................................................................7