1、BRITISH STANDARD BS EN 1825-2:2002 Grease separators Part 2: Selection of nominal size, installation, operation and maintenance The European Standard EN 1825-2:2002 has the status of a British Standard ICS 13.060.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 1825-2:2
2、002 This British Standard, 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 29 March 2002 BSI 29 March 2002 ISBN 0 580 38215 X National foreword Thi
3、s British Standard is the official English language version of EN 1825-2:2002. 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
4、 to its secretary. 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
5、BSI Standards Electronic 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 e
6、nquirers to understand 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 compr
7、ises a front cover, an inside front cover, the EN title page, pages 2 to 27 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 EN1825
8、2 February2002 ICS13.060.30 Englishversion GreaseseparatorsPart2:Selectionofnominalsize, installation,operationandmaintenance InstallationsdesparationdegraissesPartie2:Choixdes taillesnominales,installation,serviceetentretien AbscheideranlagenfrFetteTeil2:WahlderNenngre, Einbau,BetriebundWartung Thi
9、sEuropeanStandardwasapprovedbyCENon29September2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmayb
10、eobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versio
11、ns. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKO
12、MITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN18252:2002EEN18252:2002(E) 2 Contents page Foreword3 1 Scope 3 2 Normativereferences 3 3 Termsanddefinitions. .3 4 Application4 5 Nomin
13、alsize .5 6 Selectionofthenominalsize. .5 6.1 General5 6.2 Determinationofthespecificvalues .5 6.2.1 Maximumflowrateofwastewater. .5 6.2.2 Temperaturefactor f t .6 6.2.3 Densityfactor f d .6 6.2.4 Detergentandrinsingagentfactor f r 7 6.3 Specialcases. .7 6.4 Determinationofsludgetrapvolume . .7 7 In
14、stallation 8 7.1 Limitations8 7.2 Placeofinstallation . 8 7.3 Drainagetoandfromtheseparator .8 7.4 Ventilation.8 8 Operation,inspectionandmaintenance . 9 AnnexA (normative) Calculationofmaximumwastewaterflow Q s .10 A.1 Calculationbasedonequipment/fittingsdischargingintotheseparator .10 A.1.1 Genera
15、l10 A.1.2 Maximumwastewaterflowrate Q s 10 A.2 Methodbaseduponthetypeofestablishmentdischargingintotheseparator .11 A.2.1 General11 A.2.2 Maximumwastewaterflowrate Q s 11 AnnexB (informative) Densitiesofgreasesandoils14 AnnexC (informative) Examplesofdeterminingnominalsizeofgreaseseparator.16 C.1 Ex
16、amplesofcalculationbasedonequipment/fittingsdischargingintotheseparator16 C.2 Examplesofcalculationbasedonthetypeofestablishmentdischargingintotheseparator .21 AnnexD (informative) Measurestopreventgreaseaccumulatingandgreasebuildupinthepipelines upstreamofthegreaseseparator. .26 Bibliography 27EN18
17、252:2002(E) 3 Foreword ThisdocumentEN18252:2002hasbeenpreparedbyTechnicalCommitteeCEN/TC 165“Wastewater engineering“,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyAugust2002,andconflict
18、ingnationalstandardsshallbewithdrawnatthelatestby June2004. Whenpollutioncontrolrequiresthetreatmentofpollutantsotherthanlightliquids,additionalmeasuresmightbe necessary. Itisthesecondpartofatwopartstandardforgreaseseparators.Part1givesprinciplesofdesign,performance andtesting,markingandqualitycontr
19、olofgreaseseparators. AnnexAisnormative.TheannexesB,CandDareinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Italy,Ir
20、eland,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom. 1Scope ThisEuropeanStandardprovidesguidanceontheselectionofnominalsizes,installation,operationandmainten anceofgreaseseparatorsmanufacturedinaccordancewithprEN1 8251. Thisstandarddoesnotapplytowastewater
21、containinglightliquids,e.g.greaseoroilsofmineralorigin,anddoes notincludetreatingstableemulsionsofgreaseoroilinwater. Thestandarddoesnotcovertheuseofbiologicaladditives(bacteria,enzymes). 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferences,provisionsfromotherpublications
22、.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publ
23、icationreferredtoapplies(includingamendments). prEN18251:2000, GreaseseparatorsPart1:Principlesofdesign,performanceandtesting,markingandquality control. EN120562, GravitydrainagesystemsinsidebuildingsPart2:Sanitarypipework,layoutandcalculation. 3 Termsanddefinitions ForthepurposesofthisEuropeanStand
24、ardthetermsanddefinitionsgiveninprEN18251andEN120562and thefollowingapply.EN18252:2002(E) 4 3.1 selectionofthenominalsize determinationoftheappropriatenominalsizeofthegreaseseparationchamberforaspecificcase,basedon amountandtypeofinfluent 4Application Greaseseparatorsshallbeusedwhereveritisnecessary
25、toseparategreasesandoilsofvegetableandanimal originfromwastewater,suchasintradeorindustrialplants/establishments,e.g. commercialkitchensandlargecateringestablishments,e.g.ininns,hotels,motorwaysservicestations, canteens; grilling,roastingandfryingfacilities; fooddistributionpoints(withreturnablecroc
26、kery); butchersshops,withorwithoutslaughteringfacilities; meatandsausagefactories,withorwithoutslaughteringfacilities; abattoirs; poultry slaughterers; tripe preparation plants; animalrenderingplants; boneandglueboilingplants; soapandstearinefactories; oil mills; vegetableoilrefineries; margarine fa
27、ctories; picklingplants; fastfood preparation plants; chipandcrispproducers; peanutroastingplants. Wastewatercontainingaconsiderableproportionofgreaseinanonseparableform(i.e.emulsified)from applicationssuchasdairy,cheesemakingandfishprocessing,orfromdistributionpointshavingonlydishwashing facilities
28、,orfrom“wetwastecompactors“,willonlybeeffectivelytreatedingreaseseparatorsundercertain conditions.Thewastewatermayrequirefurthertreatment. Applicationswherethedischargedwastewatercontainssolidsthatarequicktopurify(e.g.thefishindustry)donot requireasludgetrap,butthegreaseseparatorshallbefittedwithast
29、rainerorscreeningdevicefittedontheinlet sidetoretaincoarsesolids.Anyretainedsolidsshouldberemovedandtheseparatorthoroughlyflushedwithclean waterbeforeoperationalintervalstopreventputrefaction.EN18252:2002(E) 5 5 Nominalsize Forthepreferrednominalsizes(NS)seeclause4ofprEN18251:2000. Multipleseparator
30、softhesamenominalsizemaybeconnectedinparallelwiththeflowsplitequallybetweeneach separator. 6 Selectionofthenominalsize 6.1General Theselectionofthenominalsizesshallbebasedonthenatureandquantityofwastewatertobetreatedtakinginto account: maximumflowrateofwastewater; maximumtemperatureofthewastewater;
31、densityofgrease/oilstobeseparated; influenceofcleansingandrinsingagents. Ifagreasestoragecapacitygreaterthan40NSinlitresisrequired,e.g.whenmorethantheusualamountof greaseisexpected,thefollowingoptionsmaybeused: 1) usingalargernominalsizeseparatorthancalculatedor 2) creatinggreasestoragecapacityoutsi
32、detheseparatoror 3) emptyingtheseparatormorefrequentlythanusually. Wherenospecificsizingmethodisofferedbyaregulatoryauthority,thenthenominalsizeoftheseparatorshallbe determinedfromthefollowingformula: r d t s NS f f f Q (1) where NS isthecalculatednominalsizeoftheseparator; Q s isthemaximumflowrateo
33、fwastewater,enteringtheseparatorinlitrespersecond; f t istheimpedientfactorforthetemperatureofinfluent; f d isthedensityfactorfortherelevantgrease/oil; f r istheimpedientfactorfortheinfluenceofcleansingandrinsingagents. Aftercalculationselectthenexthigherpreferrednominalsizeinaccordancewithclause4of
34、prEN18251:2000. 6.2 Determinationofthespecificvalues 6.2.1 Maximumflowrateofwastewater Themaximumflowrateofwastewater Q s shallbedeterminedby:EN18252:2002(E) 6 a) measurement,or b) calculationbaseduponcateringequipmentdischargingintothegreaseseparator,or c) calculationbaseduponthetypeofestablishment
35、dischargingintothegreaseseparator,or d) specialcalculationforindividualcases,ifacceptablebytheregulatoryauthority. Wheredataisavailabletodetermine Q s byb)orc),andthedesignerisunsureofthemostappropriateoptionof use,itisrecommendedthatthehigheroftheflowratesdeterminedfrombothcalculationsisused. 6.2.2
36、Temperature factor f t Highwastewatertemperaturereducestheefficiencyofgreaseseparators.Temperaturefactors f t aregivenin Table1. Table1Temperaturefactor f t Temperatureofwastewateratinlet C Temperaturefactorf t 1,0 alwaysoroccasionally60 1,3 6.2.3 Densityfactor f d Adensityfactorf d =1,0shallbeusedf
37、orwastewaterdischargedfromkitchens,abattoirsandmeatandfish processingplants. Whenthenatureofgrease/oiliswellknown,thedensitycoefficientmaybetakenfromFigure1,where f d isplotted forarangeofdifferentgreaseandoildensities. Forgrease/oildensities0,94g/cm 3 ,adensityfactorof1,5shallbeused. Densitiesofdif
38、ferentfatsandoilsaregiveninannexB.EN18252:2002(E) 7 Figure1Relationbetween f d anddensity 6.2.4 Detergentandrinsingagentfactor f r Detergents,includingdishwasherpowdersandrinsingagents,shouldcarefullybeselectedandusedsparingly. Theyshallnotimpairtheseparatingeffectasfaraspossibleandnotformstableemul
39、sionswheretheyareused upstreamofaseparator.AdetergentandrinsingagentcoefficientshallbechosenfromTable2. Table2Detergentandrinsingagentcoefficient f r Useofdetergentandrinsingagents Detergentandrinsingagentcoefficient f r Neverused 1,0 Occasionallyoralwaysused 1,3 Specialcases,e.g.hospitals Nationala
40、ndlocalregulationsmaylimittheuseofcertaindetergents,rinsingagentsandsolvents. 6.3Special cases Forindustrialplantssuchasabattoirsandwholesalebutchers,thegreaseseparatornominalsizeNSshouldbe selectedonthebasisofsitespecificinvestigation. 6.4 Determinationofsludgetrapvolume Thesludgetrapvolumeshallbea
41、tleast100NSinlitresbutforabattoirsandsimilarplantsavolumeofatleast 200NSinlitresisrecommended.EN18252:2002(E) 8 7Installation 7.1Limitations Onlywastewatercontainingorganicgreaseandoilsshallbedischargedtoagreaseseparator.Inparticular,the followingshallnotbedischargedtoagreaseseparator: wastewatercon
42、tainingfaeces(“black“water); rainwater; wastewatercontaininglightliquids,e.g.greaseoroilofmineralorigin. 7.2 Placeofinstallation Greaseseparatorsshouldbeinstalledclosetothesourcesofwastewaterbutshouldnotbesitedinunventilated rooms,roads,carparksorstorageareas.Topreventodourandflynuisance,separatorss
43、houldnotbesitedclose tohabitablebuildings,especiallytoopeningwindowsandairintakes.Theyshallbeeasilyaccessibletocleaning vehicles.Specificoperationalandstructuralconditionsmayrequiretheseparatortoberemotelylocatedfromthe sourceofwastewater. Separatorsshouldbeinstalledinsuchawaytopreventfrostdamage,andallowallpartsrequiringregular maintenancetobeeasilyaccessibleatalltimes. Wherenecessary,manholecoversonseparatorsshallbesupportedsothattheloadimposedontheseparator doesnotexceeditsdesignstrength. 7.3 Drainagetoandfromtheseparator Wherenospecificlocalregulationsexist,g
