广东省饶平县黄冈镇污水处理工程计算说明书

河海大学环境学院给水排水工程毕业设计第I页中文摘要本设计是广东省饶平县黄冈镇污水处理工程的初步设计。污水处理厂处理规模为25000m³/d，设计进水水质为：悬浮物（SS）：300mg/L；五日生化需氧量（BOD5）：200mg/L；化学需氧量（CODcr）：400mg/L；总氮（TN）：45mg/L；总磷（TP）：6.0mg/L；氨氮（NH3-N）：30mg/L。出水水质达到《城镇污水处理厂污染物排放标准》（GB18919-2002）中的一级B标准，即：悬浮物（SS）≤10mg/L；五日生化需氧量（BOD5）≤10mg/L；化学需氧量（CODcr）≤60mg/L；总氮（TN）≤10mg/L；总磷（TP）≤1.0mg/L；氨氮（NH3-N）≤5mg/L。设计进水水质氮磷含量较高，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，污水量日变化量较大，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粗格栅、提升泵房、细格栅、平流式沉砂池、厌氧池、Carrousel氧化沟、辐流式二沉池、接触消毒池、污泥贮泥池、脱水机房等。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栅和和平流式沉砂池去除比重较大的无机颗粒，在经过厌氧池后再通过氧化沟，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，经氯消毒后排放。污泥回流比为50%，其余的由污泥脱水机房浓缩脱水后外运。本次设计中省略了初次沉淀池，节省了基建和运行费用。氧化沟曝气设备简单，管理方便，且出水较为稳定，做到了水资源的合理利用。除了设计成果之外，通过阅读资料撰写了一篇名为《Carrousel氧化沟在广东省饶平县污水处理厂的应用》的论文，同时翻译了一篇名为《Carrousel氧化沟的脱氮除磷工艺设计》的英文文献。关键词：污水处理、Carrousel氧化沟工艺、脱氮除磷河海大学环境学院给水排水工程毕业设计第II页AbstractItisapreliminarydesignforthesewagetreatmentplantoftheRaoPingXianHuangGangZheninguangdongprovince.Thewaterflowis25000m3/dandthewastewaterqualityarelistedasfollows:suspendedsolid(SS):300mg/L;thebiochemicaloxygendemand(BOD5)offivedays:200mg/L;thechemicaloxygendemand(COD):400mg/L;totalnitrogen(TN):45mg/L;totalphosphorus(TP):6.0mg/L;ammonia-nitrogen(NH3-N):30mg/L.Effluentqualityisrequiredtomeetthefirstclassdischargestandard(B)in(GB18918-2002,DischargestandardOfpollutantsformunicipalwastewatertreatmentplant):suspendedsolid(SS)≤10mg/L;thebiochemicaloxygendemand(BOD5)offivedays≤10mg/L;thechemicaloxygendemand(CODcr)≤60mg/L;totalnitrogen(TN)≤10mg/L;totalphosphorus(TP)≤1.0mg/L;ammonia-nitrogen(NH3-N)≤5mg/L.Thehighlevelofnitrogenandphosphorus,Thesmallqualityofwasterwaterandthechangableofcapacity,thesearesomefactorsthatmustbeconsideredaschoosingthewasterwatertreatmentpressnitrogenandphosphorusmustberemovedtogetherwithsuspendedsolidandorganicsinthedesign.SotheCarrouseloxidatianditchprocessisemployed.Inaddition,theaerationtankwasimportinordertoenhancetheremovelofphosphorus.togetabetterandsteadyeffluentquality.Thusitisextensivelyadaptability,totallysuitableforrealityoriginallypurpose.Themainstructuresofthetreatmentprocessincludemediumbarscreen,sewagepumpingstation,thinbarscreen,vortex-typegritchamber,aerationtank,Carrouseloxidationditch,radialflowsecondarysedimentationtank,sludgeconcentrating,sludgedehydrationshopetc.Theexcresesludgewassenttothesludgedehydrationshop.Inpreliminarytreatment,theoriginalwaterentersmediumscreeninginordertoremoveheavysolidsandfloatablematerials,incasethatitinfluencestheworkingofthefollowingdevicesandthepipelines.Thenitentersvortex-typegritchamber,whichisusedtoremovebiggerinorganicsandofheavydensityafterthewastewaterispumpedintothethinscreening.Thenthewastewatergoestotheaerationtankandtheoxidationditch.Theoxidationditchisthemainunitfororganics,nitrogenandphosphorusremoval.Theseparationofwaterandsolidisaccomplishedinthesecondarysettlingtank.Atlast,thewastewaterentersChlorine河海大学环境学院给水排水工程毕业设计第III页concentrationtankandisdischarged.50%ofsludgearerecycledtotheoxidationditchandtherestarepumpedtosludgedehydrationshoptodischargeafterthickeninganddehydration.Thisdesigndon’thavepremarysettlingtank,whichreducesbuildingandoperatingexpenses.Andtheequipmentshavegoodperformances,easytobemanaged,leadingtotheeffluentreachsewagedischargestandardandsteady,accomplishingtherationalutilizationofwaterresource.ApapernamedTheapplicationofCarrouseloxidationditchinguangdongprovinceRaoPingXiansewagetreatmentplantwaspresentedaccordingtotheexperiencesofselectingbiologicalnutrientsremovalsystems.Thus,anEnglishessay--NovelstrategyofnitrogenremovalfromdomesticwastewaterusingpilotOrbaloxidationditcchwastranslated，whichisrelatedtourbanwastewatertreatment.Keywords:Wastewatertreatment;Carrouseloxidationditch;Nitrogenandphosphorusremovel河海大学环境学院给水排水工程毕业设计第IV页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...........................................................11.3区域概况...........................................................21.4自然条件...........................................................21.5给排水现状及规划...................................................31.6工程建设的必要性和工程内容.........................................32.污水收集系统设计........................................................42.1排水体制的确定.....................................................42.2污水管网设计.......................................................43.污水处理厂设计..........................................................93.1规模与处理程度的确定...............................................93.2污水处理厂工艺选择................................................113.3污水处理厂工艺设计................................................133.4污水处理厂厂区设置................................................204.工程预算与成本分析.....................................................224.1工程概况..........................................................224.2编制依据..................................................