1、BRITISH STANDARD BS EN 12255-9:2002 Wastewater treatment plants Part 9: Odour control and ventilation The European Standard EN 12255-9:2002 has the status of a British Standard ICS 13.060.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 12255-9:2002 This British Standar
2、d, having been prepared under the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 26 February 2002 BSI 26 February 2002 ISBN 0 580 39181 7 National foreword This British Standard
3、 is the official English language version of EN 12255-9:2002. The UK participation in its preparation was entrusted to Technical Committee B/505, Wastewater engineering, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary
4、. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Ele
5、ctronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to under
6、stand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for 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 cove
7、r, an inside front cover, the EN title page, pages 2 to 17 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN122559 January2002 IC
8、S13.060.30 Englishversion WastewatertreatmentplantsPart9:Odourcontroland ventilation StationsdpurationPartie9:Matrisedesodeurset ventilation KlranlagenTeil9:GeruchsminderungundBelftung ThisEuropeanStandardwasapprovedbyCENon20December2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulatio
9、nswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(En
10、glish,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece,
11、 Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymea
12、nsreserved worldwideforCENnationalMembers. Ref.No.EN122559:2002EEN122559:2002(E) 2 Contents page Foreword3 1 Scope 5 2 Normativereferences 5 3 Termsanddefinitions. .5 4 Designprinciples . 6 4.1 General6 4.2 Sourcesandnatureofodours 7 4.3 Odourmeasurement. .8 4.4 Planning8 4.4.1 Preliminaryconsiderat
13、ions .8 4.4.2 Detailedplanning . 9 4.4.3 Criteriaforselection 10 4.5 Designrequirements . 11 4.5.1 General11 4.5.2 Chemicaladdition . .11 4.5.3 Treatmentofodorousair 11 4.5.4 Designofcovers 11 4.5.5 Designofventilationplant. .12 4.6 Processrequirements .12 4.7 MaintenanceandOperation. .13 AnnexA (in
14、formative) Odourpotentialandodouremissioncapacity,measurementofodouremission rate.14 A.1 OdourPotentialandOdourEmissionCapacity. .14 Bibliography 16EN122559:2002(E) 3 Foreword ThisEuropeanStandardhasbeenpreparedbyTechnicalCommitteeCEN/TC165,“Wastewaterengineering“,the secretariatofwhichisheldbyDIN.
15、ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyJuly2002,andconflictingnationalstandardsshallbewithdrawnatthelatestby December2002. ItistheninthpartpreparedbytheWorkingGroupsCEN/TC165/WG42and43relatingtothegeneral require
16、mentsandprocessesfortreatmentplantsforatotalnumberofinhabitantsandpopulationequivalents(PT) over50.Thepartsoftheseriesareasfollows: Part1:Generalconstructionprinciples Part3:Preliminarytreatment Part4:Primarysettlement Part5:Lagooningprocesses Part6:Activatedsludgeprocesses Part7:Biologicalfixedfilm
17、reactors Part8:Sludgetreatmentandstorage Part9:Odourcontrolandventilation Part10:Safetyprinciples Part11:Generaldatarequired Part12:Controlandautomation Part13:ChemicaltreatmentTreatmentofwastewaterbyprecipitation/flocculation Part14:Disinfection Part15:Measurementoftheoxygentransferincleanwaterinae
18、rationtanksofactivatedsludgeplants Part16:Physical(mechanical)filtration 1 ) NOTE Forrequirementsonpumpinginstallationsatwastewatertreatmentplants,providedinitiallyaspart2“Pumping installationsforwastewatertreatmentplants“,seeEN7526“DrainandsewersystemsoutsidebuildingsPart6:Pumping installations”. T
19、hepartsEN122551,EN122553toEN122558andEN1225510andEN1225511wereimplemented togetherasaEuropeanpackage(ResolutionBT152/1998). 1 ) Inpreparation.EN122559:2002(E) 4 AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStanda
20、rd:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.EN122559:2002(E) 5 1Scope ThisEuropeanStandardspecifiesdesignprinciplesandperformancerequirementsforodourcontroland
21、associatedventilationforwastewatertreatmentplants. Theprimaryapplicationisforwastewatertreatmentplantsdesignedforthetreatmentofdomesticandmunicipal wastewaterforover50PT. DifferencesinwastewatertreatmentthroughoutEuropehaveledtoavarietyofsystemsbeingdeveloped.This standardgivesfundamentalinformation
22、aboutthesystems;thisstandardhasnotattemptedtospecifyallavailable systems. DetailedinformationadditionaltothatcontainedinthisstandardmaybeobtainedbyreferringtotheBibliography. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normati
23、vereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferre
24、dtoapplies(includingamendments). EN7524, Drainandsewersystemsoutsidebuildings Part4:Hydraulicdesignandenvironmental considerations. EN1085, WastewatertreatmentVocabulary . prEN13725, AirqualityDeterminationoftheodourconcentrationbydynamicolfactometry. ISO5492:1997, SensoryanalysisVocabulary . 3 Term
25、sanddefinitions ForthepurposesofthisEuropeanStandard,thetermsanddefinitionsgiveninEN1085andthefollowingapply. 3.1 olfactometry measurementoftheresponseofassessorstoolfactorystimuli(seeISO5492).DefinitionaccordingtoprEN13725 3.2 odourconcentration thenumberofEuropeanOdourUnitsinacubicmetreofgasatstan
26、dardconditions.Theodourconcentrationhas thesymbol c od andtheunitou E /m 3 (seeprEN13725) NOTEThevalueoftheodourconcentrationisthedilutionfactorthatisnecessarytoreachthedetectionthreshold.Atthe detectionthreshold,theodourconcentrationofthemixtureis1ou E/mbydefinition. EXAMPLEIfasamplehastobedilutedb
27、yafactorof300toreachthedetectionthreshold,theodourconcentrationofthe sampleis cOD=300ou E/m 3 .EN122559:2002(E) 6 3.3 odorantflowrate;odouremissionrate theodorantflowrate q od isthequantityofodoroussubstancespassingthroughadefinedareaperunittime.Itis theproductoftheodourconcentration c od ,theoutlet
28、velocity vandtheoutletarea Aortheproductoftheodour concentration c od andthepertinentvolumeflowrate V .Itsunitisou E /h,ou E /minorou E /s(seeprEN13725) NOTEDiffusesourcessuchasunaeratedwastewaterorsludgesurfaces,donothaveadefinedwasteairflow,althoughthey canemitodorants.Inthesecases,aspecialsamplin
29、gprocedureisnecessarywhichisdiscussedinprEN13725(seeannexA). Odorantflowratescanbeusedinananalogousfashiontomassflowrateswhenmodellingtheimpactfroma source.Allodoursourceswillhaveanodorantflowrate,evenwherenoairflowrateiseasilyidentifiable. 4 Designprinciples 4.1General Giventhenatureofwastewateriti
30、snotpossibletoguaranteethatawastewatertreatmentplantwillbetotallyodour free.Awelldesignedplantminimisesthepotentialforodourproblems. Thepotentialforodourgenerationshallbeconsideredattheearlieststagesinthedesignofwastewatertreatment works.Thelikelihoodofodouremission,itsimpactandeaseoftreatmentshallb
31、econsideredinallaspectsof design,especially: a) Minimisethesepticityoftherawwastewaterbyconsideringtheseweragesystem. b) Processselectione.g.ifsepticwastewaterisanticipated,possibilitiestominimiseodourareforexample: minimisetheretentiontimeofthesludgeintheprimarysettlementtank; havingnoprimarysettle
32、ment(thusavoidingamajorsourceofodour)andapplyingextendedaeration; selectacoveredprocess. c) Bylocatingthemajorsourcesofodour,whereverpossible,awayfromthemostsensitivelocationssurrounding theplant.Forplanningthedirectionandspeedofwindslocaltotheinstallationshallbetakenintoaccount. NOTESituationswithl
33、ightwindornowindandstableatmosphericconditionsaremostunfavourableforthedispersionof odours.Thus,ifthesesituationshappenveryoften,thenthelocalwinddirectionduringthesesituationsisrelevantinstead of thegenerallyprevailingwinddirection. d) Byconsideringthelocationofunitprocessesrelativetoeachotheritmayb
34、epossibletouseasingleabate mentprocesstotreatmorethanonesourceofodourortousetheodorousairfromoneprocessasprocessor combustionairinanadjacentprocess.Anydecisiontotreatodorousairwillrequireaprocesstobecovered andventilatedwiththeventedairductedtotreatment.Covering,ventingandtreatmentshallbedesignedas
35、anintegratedpackage. Wheretreatmentplantsarenotcoveredorhousedinbuildingsandtheeffectofodourisdifficulttoquantifypriorto commissioningdesignsshouldallowforcoveringand/orventilationatalaterdate. Whentanksorprocessesarecoveredcarefulconsiderationisrequiredof: a)explosion risk; b) corrosionprevention;
36、c) healthandsafetyofoperators;EN122559:2002(E) 7 d)access for maintenance. 4.2 Sourcesandnatureofodours Odourisgeneratedduringtheconveyanceandtreatmentofwastewaterduetothedegradationoforganicmatter bymicroorganismsunderanaerobicconditions.Industrialwastewatercanalsocontaincharacteristicodorous const
37、ituents.Theonsetofsepticitycanbeacceleratedbyelevatedtemperatures,highBODconcentrationand presenceofreducingchemicals.Therangeofodorousconstituentsisverywideandincludes: hydrogen sulphide; ammonia; organicsulphurcompounds; thiols(e.g.mercaptans); amines; indole and skatole; volatilefattyacids; other
38、organiccompounds. Theconditionsthatgiverisetoodoursoccurmosttypicallyin: unfavourableconditionsinthesewagesystems(e.g.longretentiontimes,poormaintenance,industrial discharges); longpressuremains; somehighratetreatmentprocesses; anaerobic lagoons; sludgestorageandtreatmentprocesses. Odourscanbepresen
39、torforminthesewersystemorinthetreatmentplant.Onceformed,odourstendtotravel withtheflowthroughthetreatmentprocesstobetransferredtotheatmosphereatpointsofturbulenceorwhere thereisalargeairwaterinterface.Levelsofodourcanbeincreasedbytherecyclingofliquorswithinatreatment process,particularlywhenrecyclin
40、gthoseproducedbythethickeningordewateringofsludge. NOTE EN7524givesguidanceonminimisingsepticityindrainandsewersystems. Particularproblemscanhoweverbefoundat: a) inletworks:strongodoursintheincomingflowleadtohighlevelsofreleaseatinletworks; b) primarysettlementtanks:iftheyreceiveahighlyodorousflowor
41、ifexcessivesludgeisallowedtoaccumulate inthetank,generatingsepticity; c) secondarytreatmentifitishighlyloadedorreceivesahighlyodorousfeed; d) sitesforthetransfer,storageandtreatmentofsludges,especiallyofnonstabilisedsludges; e) leaksoremissionsofbiogasfromanaerobicdigestionandthefirstpointofdischarg
42、eofdigestedsludge.EN122559:2002(E) 8 4.3 Odourmeasurement Quantitativemeasurementsofodourshallbecarriedoutwhenundertakinginvestigationsintothecausesofodour, foridentifyingsiteswhereodourisformedoremitted,forestimatingtheimpactfromanodoursourceandfor specifyingthedutyofodourabatementequipment. Quanti
43、tativemeasurementsofodourinclude: a) Measurementbasedonolfactometry: theodorantdetectionthresholdconcentrationapplicabletosinglecompounds; theodourconcentrationapplicabletoairsamplesofunknowncomposition; theodourpotentialandodouremissioncapacity(seeannexA); theodorantflowrate(seeannexA). b) Measurementsbasedonspecificcompounds: themeasurementofspecificodorouscompoundscanassistinthechoiceanddimensionsoftreatmentunits; levelsofhydrogensulphid
