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1、扬州职业大学毕业设计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
2、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
3、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AbstractSewagetreatmentplantscaleoftherecent30000m³/d,forward60000m³/d,thedesignwaterqualityare:suspendedsolids(theSS):30mg/L;5,biochemicaloxyge
4、ndemand(ofBOD5):30mg/L;chemicaloxygendemand(CODcr):100mg/L;twostandardsofwaterqualityofurbansewagetreatmentplantemissionstandards(GB18918-2002),developmentofwaterqualityindicators:ofCODCr:≤100mg/L;ofBOD5≤30mg/L;SS≤30mg/L;ofNH3-N≤10mg/LDesignhighwaterqualitynitrogencon
5、tentinthedesignoftreatmentprocessesisalsoneedtoconsidernitrogenandphosphorusremovaltechnology,thesmallerwastewatertreatmentplant,sewagelargervariationinthedesignprocesstoadapttothesituationoftheoxidationditchprocess.Addedbeforetheoxidationditchanaerobictanktoimproveph
6、osphorusremoval.Achievethepurposeofwaterqualitystandardsandstable.Thedesignofthemainstructures,includingthesetofwells,thecoarsegrid,pumpingstations,thefinegrid,aeratedgritchamber,carrouseloxidationditch,theradialflowsedimentationtank,withwells,sludgethickener,sludgede
7、wateringworkshopandsoon.Grilleinterceptlargersuspendedsolidsandfloatingdebrisinthesewagethathasbeencollectedbythemunicipalsewernetwork,upgradethesewagepumpingstationtothefinegridpooltoremovealargeproportionofinorganicparticlestoremovealotoforganicmatterthroughoxidatio
8、nditch,achievetheeffectofnitrogenandphosphorusremoval.Treatedsewagemudinthesecondarysettlingtanksradialflowseparation,andthe