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目录目录..................................................................................................................................................1摘要..................................................................................................................................................2Abstract.............................................................................................................................................3第一章绪论....................................................................................................................................41.1概述.....................................................................................................................................41.2城市污水的来源及水质.....................................................................................................41.3废水处理的方法.................................................................................................................51.3.1物理处理法..............................................................................................................51.3.2化学处理法..............................................................................................................61.3.3物化处理法..............................................................................................................71.3.4生化处理法..............................................................................................................71.4城市污水处理的现状.........................................................................................................7第二章工艺论证............................................................................................................................82.1城市生活污水处理工艺途径.............................................................................................9第三章设计计算..........................................................................................................................143.1.1平均流量的计算....................................................................................................143.1.2粗格栅的计算........................................................................................................143.2沉砂池的计算...................................................................................................................173.3调节池的计算...................................................................................................................183.4厌氧塘...............................................................................................................................193.5中沉池...............................................................................................................................233.6生物接触氧化池...............................................................................................................253.7接触沉淀池计算...............................................................................................................28参考文献........................................................................................................................................33摘要本设计采用A/O工艺(即厌氧—好氧工艺)处理城市生活污水,处理量为22000m3/d.该处理的原始水质为高浓度水质，水质指标为:CODcrcr300mg/l;BOD5为250mg/l;SS浓度为260mg/l。在处理前段,污水通过曝气沉砂池进行预曝气处理,为后续工序的处理减轻负荷.水质去除率可达到:BOD5为22%;CODcr为20%;SS为10%.在处理过程中,污水通过厌氧塘和生物接触氧化池这两个重要工艺段,分别进行厌氧—好氧处理。在厌氧段中,厌氧塘的结构采用了UASB反应器的一些结构形式,再加上布水器具有促使污泥与原有有机物充分混合的作用，使得厌氧程度得到进一步加深。处理水质为:CODcr浓度为200mg/l;BOD5浓度为180mg/;SS浓度为50mg/l.在好氧段中,生物接触池采用二段式的生物接触氧化池.污水经过两次氧化池,两次沉淀池交替作用，去除率可达到：CODcr为82%;BOD5为88%;SS为50%.最终出水指标为:CODcr浓度为55mg/l;BOD5浓度为15mg/l;SS浓度为10mg/l，该出水水质已达到国家一级B类排放标准.关键字:城市生活污水A/O工艺厌氧塘生物接触氧化池AbstractThisdesignusesA/Oprocess(thatisanaerobic-aerobicprocess)treatmentofmunicipalsewage,thehandlingcapacityof22000m3/d.Thetreatmentofrawwaterqualityforthehighconcentrationofwaterquality,waterqualityindicators:CODcr300mg/l;BODof250mg/l;SSconcentrationof260mg/l..Indealingwiththeprecedingparagraph,sewageaerationgritchamberaerationpre-treatmentprocessforfollow-uptoreducetheprocessingload.Waterremovalcanbeachieved:BOD5is22%;CODcrof20%;SSwas10%.Intheprocess,thesewagethroughanaerobicpondandbio-contactoxidationpondsectionofthesetwoimportantprocesses,namely,anaerobic-aerobictreatment.Intheanaerobicsection,theanaerobicpondthestructureofUASBreactorusinganumberofstructuralforms,coupledwithclothwatertrapshavepromptedwell-mixedsludgeandtheoriginalroleoforganicmatter,makingtheextentofanaerobictobefurtherdeepened.Dealwithwaterquality:CODcrconcentrationof200mg/l;BOD5concentrationof180mg/;SSconcentrationof50mg/l.Intheaerobicsegment,thebio-contacttankwithtwo-stagebiologicalcontactoxidationtank.Effluentaftertwooxidationponds,theroleofthetwosedimentationbasinsalternately,theremovalcanbeachieved:CODcrof82%;BOD5of88%;SSis50%.theultimatewaterindicators:CODcrconcentrationof55mg/l;BOD5concentrationof15mg/l;SSconcentration10mg/l,theeffluentqualityhasreachedthenationallevel,ClassBemissionsstandards.Keyword:urbandomesticsewage；A/Oprocessanaerobicpond；bio-contactoxidationpond第一章绪论1.1概述据有关部门统计：1997年，全国城市的污水年排放总量为3