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水污染控制工程03污水的物理处理(PHYSICALTREATMENTOFWASTEWATER03INWATERPOLLUTIONCONTROLENGINEERING)THETHIRDCHAPTERISTHEPHYSICALTREATMENTOFSEWAGESECTION1GRILLESANDSCREENSTHESECONDSECTIONISTHEBASICTHEORYOFSEDIMENTATIONTHIRDIDEALSETTLINGTANKFOURTHSECTIONGRITCHAMBERFIFTHSECTIONSETTLINGTANKSIXTHSECTIONREGULATINGTANKSECTION1GRILLESANDSCREENSSELECTTHEORIGINALSPACINGOFTHEGRIDBARSNOCLOGGINGOFPUMPANDWATERPROCESSINGEQUIPMENTATTHEPLANTANDSTATIONTHEGRILLEISMADEUPOFASETOFPARALLELMETALBARSANDFRAMES,WHICHAREINSTALLEDATTHEINLETOFTHEWATERINLETORTHEINLETOFTHEWATERCOLLECTINGSTATIONTOINTERCEPTTHELARGESUSPENDEDPARTICLESANDIMPURITIESINTHESEWAGEEFFECTSREMOVETHELARGERSUSPENDEDMATERIALTHATMAYCLOGTHEPUMPUNITANDTHEPIPEVALVE,ANDENSURETHENORMALOPERATIONOFTHESUBSEQUENTHANDLINGFACILITIESTHEAMOUNTOFPOLLUTANTSTRAPPEDINTHEGRILLEANDTHECONDITIONSOFTHEAREA,SEWAGEDITCHESTHETYPEOFTHESYSTEMISRELATEDTOTHEDISCHARGEOFTHESEWAGEANDTHESPACINGOFTHEGRIDBARS,SOMEDATATHATCANBEREFERENCEDWHENTHEBARSPACINGIS1625MM,THEGATESLAGREJECTIONIS010005M3/103M3SEWAGEWHENTHEBARSPACINGISABOUT40MM,THEGATESLAGREJECTIONIS003001M3/103M3SEWAGETHEMOISTURECONTENTOFTHEGATESLAGISABOUT80,ANDTHEDENSITYISABOUT960KG/M3METHODFORCLEANINGSLAGOFGRILLEGRILLEBARSECTIONSHAPEBYPASSCHANNELFLOWVELOCITYOFWATERSEWAGEBARRIERSTRIPSPACINGVELOCITYGRILLEBARSECTIONSHAPEBYPASSCHANNELFLOWVELOCITYOFWATERSEWAGEBARRIERSTRIPSPACINGVELOCITYGRILLEBARSECTIONSHAPEBYPASSCHANNELFLOWVELOCITYOFWATERSEWAGEBARRIERSTRIPSPACINGVELOCITYXGTYPEROTARYGRILLECLEANINGMACHINEROTARYSOLIDLIQUIDSEPARATORGLTYPEGRILLEDECONTAMINATIONMACHINERAKETYPEGRILLECLEANINGMACHINEFINEGRILLEOFAERATIONGRITTANKDESIGNANDCALCULATIONOFGRATINGCALCULATIONOFHEADLOSSH2THROUGHTHEGRILLEFORMULAH0CALCULATIONOFHEADLOSS,MVTHEVELOCITYOFTHESEWAGETHROUGHTHEGRILLE,M/SZETADRAGCOEFFICIENT,THEVALUEANDTHEGEOMETRYOFTHEBARSECTIONPLACEMENTANGLEOFTHEGRILLEGGRAVITATIONALACCELERATION,M/S2KTAKINGINTOACCOUNTTHECOEFFICIENTOFRESISTANCEINCREASEWHENTHEGRILLEISBLOCKEDBYCONTAMINANTS,AVAILABLEK336V132,USUALLYK3MUNICIPALSEWAGEGENERALLYTAKE0104MDESIGNANDCALCULATIONOFGRATINGBUILDINGDIMENSIONSOFGRATINGS1THECLEARANCENUMBEROFTHEGRILLENMEDIUMQVMAXMAXIMUMDESIGNSTREAMVOLUME,M3/SDBARSPACING,MHTHEDEPTHOFTHEGRID,MVTHESEWAGEFLOWSTHROUGHTHEGRILLESPEED,M/SBUILDINGDIMENSIONSOFGRATINGS4THETOTALCONSTRUCTIONLENGTHOFTHEGRIDLTYPEL1WATERINLETGRADUALLYWIDERPARTSLENGTH,MOFWHICHB1INLETCHANNELWIDTHMALPHA1THEINLETCHANNELBECOMESWIDERTHEEXPANSIONANGLEISGENERALLYALPHA120DEGREESL2THEGRILLEISCONNECTEDTOTHEOUTLETCHANNELTHELENGTHOFTHENARROWERPARTOFTHEJOINTL205L1H1THEDEPTHOFTHECHANNELBEFORETHEGRILLE,MEFFECTUSEDFORWASTEWATERTREATMENTORRECOVERYOFSHORTFIBERSFORMVIBRATIONSCREENHYDRAULICSCREENSTATIONARYSCREENLANDFILLINCINERATIONABOVE820DEGREESCELSIUSCOMPOSTTHESLAGISCRUSHEDANDTHENRETURNEDTOTHEWASTEWATERSINKSOLIDSINTOPRIMARYCLARIFIERDISPOSALMETHODFORPOLLUTANTTRAPPEDBYGRILLEANDSCREENMESHTHESECONDSECTIONISTHEBASICTHEORYOFSEDIMENTATIONSEDIMENTATIONISTHEUSEOFSUSPENDEDPARTICLESINWATERFORSETTLINGPROPERTIESATGRAVITYAPROCESSTHATPRODUCESASINKINGACTIONTOACHIEVESOLIDLIQUIDSEPARATIONFOURUSESOFPRECIPITATIONTREATMENTPROCESSACCORDINGTOTHECOHESIONANDCONCENTRATIONOFSUSPENDEDPARTICLESINWATER,PRECIPITATIONCANBEDIVIDEDINTOFOURTYPESFREEPRECIPITATIONANDITSTHEORETICALBASISBRANCHANALYSISTHEFALSESETTHEFORCEOFSUSPENDEDPARTICLESINWATERGRAVITY,BUOYANCYWHENGRAVITYISGREATERTHANBUOYANCY,ITSINKSWHENGRAVITYEQUALSBUOYANCY,RELATIVESTILLNESSWHENGRAVITYISLESSTHANBUOYANCY,FLOATUP1SUSPENDEDPARTICLESRECEIVEDINWATERFGFGISTHEPRECIPITATINGFORCE,ITISTHEGRAVITYOFPARTICLESANDTHEBUOYANCYOFWATERPOORFORMULAFGTHEPARTICLESINTHEWATEREXERTIONVTHEVOLUMEOFPARTICLESPPARTICLEDENSITYSPL,THEDENSITYOFWATERGGRAVITYACCELERATIONFORCEANALYSISOFSUSPENDEDPARTICLESINWATERAFORMULAFORSETTLINGVELOCITYOFFREESETTLINGOFSPHERICALPARTICLESWHENTHEEXTERNALFORCEOFTHEPARTICLEISBALANCED,THESETTLINGVELOCITYFORMULAFORSPHERICALPARTICLESWITHFREEPRECIPITATIONWHENTHEFLOWVELOCITYAROUNDTHESETTLEMENTOFSMALLPARTICLESIZE,SETTLINGVELOCITY,SMALLPARTICLESDURINGTHEHOURAROUNDALSO,THEVISCOUSRESISTANCEEFFECTOFPARTICLESAREMAINLYAFFECTEDBYWATER,THEINERTIAFORCECANBENEGLECTED,THEPARTICLEMOTIONISINLAMINARFLOWINLAMINARFLOW,THEEQUATIONOFMOTIONOFAFREEPARTICLEINSTILLWATERALSOKNOWNASSTOKESSLAWISFORMULATEDINTHELAMBDA24/REFORMULATHEKINETICVISCOSITYOFMUWATERFROMTHEABOVEFORMULA,THEPARTICLESEDIMENTATIONRATEUSISRELATEDTOTHEFOLLOWINGFACTORSWHENTHESISGREATERTHANPPL,PS,PLPOSITIVEGRANULESBYUSSINKWHENPSANDPLISEQUALTOUS0,ASTATEOFSUSPENDEDPARTICLESINTHEWATER,THEPARTICLESCANNOTBEUSEDTOPRECIPITATEANDREMOVESISLESSTHANPPL,PS,PLISNEGATIVE,USPARTICLESTOFLOATTHEMETHODTOREMOVETHEAVAILABLEFLOATUSISPROPORTIONALTOTHESQUAREOFTHEPARTICLEDIAMETERD,SOINCREASINGTHEPARTICLEDIAMETERISHELPFULTOIMPROVETHEPRECIPITATIONVELOCITYORFLOATINGVELOCITYANDIMPROVETHEREMOVALEFFICIENCYUSISINVERSELYPROPORTIONALTOMU,ANDDECREASESWITHTHEINCREASEOFWATERTEMPERATURETHATISTOSAY,THESETTLINGVELOCITYISAFFECTEDBYWATERTEMPERATURE,THEWATERTEMPERATURERISES,ANDTHESETTLINGVELOCITYINCREASESTHIRDIDEALSETTLINGTANKTHEWORKINGPRINCIPLEOFSEDIMENTATIONTANKIDEALSETTLINGTANKDIVIDEINTOIMPORTAREAS,PRECIPITATIONAREAS,EXPO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