EN 12255-15-2003 en Wastewater treatment plants Part 15 Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants《废水处理工厂 第15部分 活性污泥处理厂曝气池清水中充氧量.pdf

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1、BRITISH STANDARD BS EN 12255-15:2003 Wastewater treatment plants Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants The European Standard EN 12255-15:2003 has the status of a British Standard ICS 13.060.30 BS EN 12255-15:2003 This British Standard

2、, was published under the authority of the Standards Policy and Strategy Committee on 17 December 2003 BSI 17 December 2003 ISBN 0 580 43094 4 National foreword This British Standard is the official English language version of EN 12255-15:2003. The UK participation in its preparation was entrusted t

3、o Technical Committee B/505, Waste water engineering, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this

4、document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contr

5、act. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals fo

6、r change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover. The BSI copyrig

7、ht notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN1225515 December2003 ICS13.060.30 Englishversion WastewatertreatmentplantsPart15:Measurementofthe oxygentransfe

8、rincleanwaterinaerationtanksofactivated sludgeplants StationsdpurationPartie15:Mesuredeperformances desarateurs KlranlagenTeil15:MessungderSauerstoffzufuhrin ReinwasserinBelftungsbeckenvonBelebungsanlagen ThisEuropeanStandardwasapprovedbyCENon3November2003. CENmembersareboundtocomplywiththeCEN/CENEL

9、ECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthree

10、officialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,Fra

11、nce,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allri

12、ghtsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN1225515:2003EEN1225515:2003(E) 2 Contents page Foreword. 3 1 Scope . 4 2 Normativereferences . 4 3 Termsanddefinitions. 4 4 Symbolsandabbreviations . 5 5 Principleandprocedures . 6 6 Aerationtanks,testwater,equ

13、ipmentandchemicals 7 6.1 Aerationtanksandaerationinstallations . . 7 6.2 MeasuringEquipment . . 7 6.2.1 Dissolvedoxygenprobes(DOprobes) . . 7 6.2.2 Recordingofthedissolvedoxygenconcentration . 8 6.2.3 Temperaturemeasurement. . 8 6.3 Chemicals 8 6.3.1 Sodiumsulphite . . 8 6.3.2 Cobaltcatalyst. 8 6.3.

14、3 Nitrogenandpureoxygengas 8 6.4 Testwater 8 7 Procedure 9 7.1 Planningoftesting. . 9 7.2 Advancepreparationandresponsibilities . 9 7.3 Fillingofthetankwithtestwater. . 10 7.4 InstallationoftheDOprobes. 10 7.5 Additionofchemicals. 11 7.5.1 Cobaltcatalyst. 11 7.5.2 Sodiumsulphite . . 11 7.6 Gasinject

15、ion. . 12 7.7 Datacollectionduringatest. . 12 7.8 Dataanalysis . 13 8 Precisionandaccuracyofresults. 13 8.1 Standardoxygentransferrate. 13 8.2 Standardaerationefficiency 13 8.3 Specificstandardoxygentransferefficiency 14 9 Presentationandinterpretationoftheresults .14 AnnexA (normative) Alternativet

16、estandevaluationprocedure . 15 A.1 Principle. 15 A.2 Measurementoftheoxygensaturationvalue 15 A.3 InsitucalibrationoftheDOprobes 15 A.4 Determinationoftheoxygentransfercoefficient 15 Bibliography . 16EN1225515:2003(E) 3 Foreword Thisdocument(EN1225515:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC16

17、5“Wastewater engineering”,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyJune2004,andconflictingnationalstandardsshallbewithdrawnat thelatestbyJune2004. ItisthefifteenthPartpreparedbythe

18、WorkingGroupsCEN/TC165/WG42and43relatingtothegeneral requirementsandprocessesfortreatmentplantsforatotalnumberofinhabitantsandpopulationequivalents (PT)over50.EN12255withthegenerictitle“Wastewatertreatmentplants“consistsofthefollowingParts: Part1:Generalconstructionprinciples Part3:Preliminarytreatm

19、ent Part4:Primarysettlement Part5:Lagooningprocesses Part6:Activatedsludgeprocess Part7:Biologicalfixedfilmreactors Part8:Sludgetreatmentandstorage Part9:Odourcontrolandventilation Part10:Safetyprinciples Part11:Generaldatarequired Part12:Controlandautomation Part13:ChemicaltreatmentTreatmentofwaste

20、waterbyprecipitation/flocculation Part14:Disinfection Part15:Measurementoftheoxygentransferincleanwaterinaerationtanksofactivatedsludgeplants Part16:Physical(mechanical)filtration NOTE Forrequirementsonpumpinginstallationsatwastewatertreatmentplants,providedinitiallyas Part2: Pumpinginstallationsfor

21、wastewatertreatmentplants ,seeEN7526 Drainandsewer systemsoutsidebuildingsPart 6:Pumpinginstallations . ThepartsEN122551,EN122553toEN122558andEN1225510andEN1225511wereimplemented togetherasaEuropeanpackage(ResolutionBT152/1998). AnnexAisnormative. AccordingtotheCEN/CENELECInternalRegulations,thenati

22、onalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands, Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN1225515:20

23、03(E) 4 1Scope ThisEuropeanStandardspecifiesthenonsteadystatemeasurementoftheoxygentransferrateandthe oxygentransferefficiencyofaerationsystemsinactivatedsludgeaerationtanks(seeEN12 2556)whenfilled withcleanwater. NOTE1 Thisisknownasthecleanwatertest. NOTE2 Sincethemethodisbasedoncompletelymixedtank

24、sortankswithevenlydistributedaeratorsordiffusers testresultsfromcertainaerationinstallationscanbeincorrect. NOTE3 Underprocessconditionswithmixedliquortheoxygentransferrateandtheoxygentransferefficiencycanbe differentfromthecleanwatertestresults.Thisisexpressedbythe a factor. 2 Normativereferences T

25、hisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonly

26、whenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies(includingamendments). EN1085, WastewatertreatmentVocabulary. EN25814, Water quality Determination of dissolved oxygen Electrotechnical probe method (ISO5814:1990). 3 Termsanddefinitions F

27、orthepurposesofthisEuropeanStandard,thetermsanddefinitionsgiveninEN1085andthefollowing apply. 3.1 standardoxygentransferrate(SOTR,kg/h) massofoxygentransferredperhouratstandardconditions(watertemperature T=20 C,barometric pressurep=1013hPa,zerodissolvedoxygenconcentration),toanaerationtankfilledwith

28、cleanwater (Volume V,m)equippedwithanaerationdeviceorsystemandoperatedataspecifiedaerationsetting.Itis obtainedas: 1000 20 , 20 S L C a k V SOTR = (1) 3.2 standardaerationefficiency(SAE,kg/kWh) ratioofstandardoxygentransferrateandtotalwirepoweruptake( P,kW)measuredduringthetest 3.3 specificstandardo

29、xygentransferefficiency (SSOTE,%/m) percentoxygenabsorbedpermetrediffusersubmergence( h D ,m).SSOTEmayalsobeexpressedin g/(mm) 1 1 Thevolumeexpressedinm 3 isapplicabletostandardconditions(dryair,zerohumidity,p=1013hPa,T=0C),seealso 3.9.EN1225515:2003(E) 5 () m % 299 , 0 100 A D = Q h SOTR SSOTE (2)

30、or () m) g/(m h Q SOTR SSOTE 3 D A = 1000 (3) 3.4 oxygentransfercoefficient( k L a T ,h 1 ) determinedbyevaluationofanoxygentransfertestincleanwateratacertainaerationsettingandatacertain temperature.Itisconvertedtothestandardtemperatureof T=20Casfollows: () T 20 T L 20 L 024 , 1 = a k a k (4) 3.5 st

31、andardoxygensaturationvalue( C S,St,T ,mg/l) aslistedinEN25814for p St =1013hPa,e.g.: C S,St,20 =9,09mg/l 3.6 testoxygensaturationvalue( C S,p*,T ,mg/l) oxygensaturationvalueofanoxygentransfertestincleanwaterataspecificwatertemperature( T,C)anda specificbarometricpressure( p*,hPa).Thetestoxygensatur

32、ationvalueisconvertedtostandardconditions asfollows: ) / ( ) / ( , * St T St, S, St,20 S, T p S, S,20 * p p C C C C = (5) 3.7 middepthoxygensaturationvalue( C S,md,20 ,mg/l) fordiffusedairaerationthemiddepthoxygensaturationvalueforstandardconditionsiscalculatedasfollows (10,35mofwaterisequivalentto1

33、013hPa): () 10,35) 2 ( / 1 D St,20 S, md,20 S, + = h C C (6) 3.8 diffusersubmergence( h D ,m) depthbelowthewaterlevelofairreleasefromthediffuserwithoutaerationoperating 3.9 normalairflowrate( Q A ,m/h) airflowratedeliveredtotheaerationtank,correctedforstandardconditions(dryair,zerohumidity, p=1013hP

34、a, T=0C) 3.10 aerationsetting fordiffusedairaeration:aspecifiedairflowrateataspecifieddiffuserdepthwithorwithoutadditionalmixing; forsurfaceaerators:aspecifiedfreeboardoraspecifiedimmersiondepthataspecifiedrotaryspeedandwith orwithoutbafflesand/oradditionalmixing 4 Symbolsandabbreviations h D diffus

35、ersubmergence,inmetre(m) C 0 oxygenconcentrationat t=0,inmilligrammeperlitre(mg/l)EN1225515:2003(E) 6 C i initialconcentrationofdissolvedoxygeninthetankwithoutsodiumsulphite,inmilligrammeperlitre (mg/l) C S,20 testoxygensaturationvalueatstandardconditions,inmilligrammeperlitre(mg/l) C S,md,20 middep

36、thoxygensaturationvalue,inmilligrammeperlitre(mg/l) C S,p*,T testoxygensaturationvalue,inmilligrammeperlitre(mg/l) C S,p,T, oxygensaturationvalueafteraprolongedaerationperioddeterminedbyWinklertitration(see EN25813),inmilligrammeperlitre(mg/l) C S,St,T standardoxygensaturationvalue,inmilligrammeperl

37、itre(mg/l) C S,St,T, standardoxygensaturationvalueatthetemperatureatwhichthesaturationvaluehasbeen determinedbyWinklertitration,inmilligrammeperlitre(mg/l) C t oxygenconcentrationattime t,inmilligrammeperlitre(mg/l) k L a 20 oxygentransfercoefficientat T=20C,in1/h k L a T oxygentransfercoefficientat

38、testtemperature,in1/h M So massofsodiumsulphiteneededforonetest,inkilogramme p barometricpressureduringsamplingforWinklertitration,inhectopascal(hPa) p* barometricpressureduringatest,inhectopascal(hPa) p St barometricstandardpressure(1013hPa),inhectopascal(hPa) Q A normalairflowrate,incubicmetreperh

39、our(m 3 /h) 2 t M mixingperiodatoxygenconcentration C=0,inminutes(min) V tankvolume,incubicmetre 3 (m 3 ) 5 Principleandprocedures Afterdecreasing(absorptiontest)orincreasing(desorptiontest)thedissolvedoxygenconcentrationofan aerationtankatconstantmixingandacertainaerationsettingtheincreasingordecre

40、asingdissolvedoxygen concentrationismonitored.Thisisdescribedbythefollowingequation: ) ( exp ) ( , t a k C C C C - - - = T L 0 T , p S, T p S, t * * (7) Byanonlinearregressionmethodequation(7)isfittedtothemeasuredvaluesofC t .Thevaluesfor C 0 , C S,p*,T andk L a T areobtained.Theresidues( C t (measu

41、red) C t (calculated)plottedversustimeshallberandomly distributed.Iftheyfollowacurveanewevaluationshallbeperformedatwhichoneormorevaluesof C t from thebeginningand/orendofthecurvearetobeneglected.Anycomputerprogramfornonlinearparameter 2 Thevolumeexpressedincubicmetre isapplicabletostandardcondition

42、s(dryair,zerohumidity,p=1013hPa,T=0C), seealso3.9.EN1225515:2003(E) 7 estimationmaybeused,e.g.Stenstrometal.1981.ThedisksprovidedbyASCE1992,byATV1996or byFUL1995maybeusedaswell. Thevalueofk L a T isnotaffectedbythecalibrationoftheDOprobes.TheexactdeterminationofC S,p*,T requiresaccuratelycalibratedD

43、OprobesorWinklertitration,seeEN25813andEN25814. ExperiencedInstitutionsmayapplylinearestimation(logdeficitmethod)of k L a T usingameasuredoxygen saturationvalue C S,p,T ,seeannexA. Theoxygentransferabsorptiontestisthemostcommontestmethodbywhichthedissolvedoxygen concentrationoftheaerationtankisatfirstdecreasedbyadditionofsodiumsulphiteorbyinjectionofnitrogen gasandthenaeratedclosetooxygensaturation.Fromtheincreasingdissolvedoxygenconcen