THE IMPORTANCE OF JAR TEST IN WATER AND ...

Jar test is a pilot-scale laboratory test that simulates coagulation or flocculation with differing chemical doses. The purpose of this test ... 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Thechoiceanddosingofthechemicalcoagulants deriveinfactfromtheresultsofthelaboratoryJartest,which mimicsfull-scaleoperationinwatertreatmentplants. ThemostusedcoagulantsareLime(calciumhydroxide),Alum(aluminumsulphate)andIronsalts(ferricorferrous). FlocculationorCoagulationisfundamentalineverywatertreatmentprocessanditisapropaedeuticstepforsedimentation,filtrationanddisinfectionbeforedistributingwaterforresidentialandindustrialuse.Howitworks:JarTestanalyticalprocedureUsingaflocculator,thecoagulantsubstanceisaddedtothewatersamplebeakers.Thechemicalcoagulantstartstoprecipitatetrappingalltheimpuritiesand formingflocsthatwilldepositonthebottomofthebeaker.  Thesampleiscontinuouslystirredsothattheformation,development,andsettlementoffloccanbeobservedjustasitwouldoccurinthefull-scalewatertreatmentplant. TheoperatorthenperformsaseriesofteststocomparetheeffectsofdifferentamountsofflocculationagentsatdifferentpHvaluestodeterminetherightsizefloc. Themostcommon analyticalconditionsusingaflocculatorare: 1000mlglassbeakers(jars),tallform,Ø105mm 600mlwastewatersamples+coagulant Heightofpaddles:middleheightofthesample Turbulentstirring:120rpm,120seconds Slowspeedflocculation:30rpm,25minutes Firstevaluationofresultsafter5minutesofsedimentation Resultevaluationforfull-scaleapplicationandoptimizedperformanceTheresultsoftheJarTestcanbeevaluatedbasedondifferentcriteria: Flocdimensionevaluationwithanumericaldegree Timefromtheadditionofchemicalstothefirstappearanceofflocs Evaluationofresidualturbidityofsupernatant,afteradeterminedsedimentationtime,byturbidimeter Measurementoftheelectro-kineticpotentialofsuspendedparticlesonasampletakenimmediatelyaftertheadditionandmixingofchemicals Evaluationoffilterabilityofclarifiedwaterbystandardizedmembranefiltersunderpressure.Thereductionofwaterflowisrelatedtothedegreeofcloggingoffiltersduetoresidualunsettledsuspendedmatters VELPdedicatedsolutionsforFlocculationTheJarTesthelpswatertreatmentplantlaboperatorstoavoidoverfeedingoroverdosing,especiallywithcoagulantssavingresourcesandoptimizingprocesses.VELPsolutionsforJarTestarerobustproductswithstrongresistancetochemicalandmechanicalcorrosion. The illuminatedbackpanelenablessimpleandclearflocobservationandevaluationleadingtomaximizedreproducibility. VELPFlocculatorsoftheJLTandFCSserieswithmultiplestirrersandreproduciblespeedguaranteestandardconditions,abasicrequirementforreliableresultsaccordingtoreferencemethodASTMD-2035. VELPflocculatorsfeatureindependentspeedperpositionorsinglespeedwithdigitaldisplayandtimer,meetingtherequirementsofeverylab.Wheneverrequired,theVELPFP4isaportableflocculatorallowingtestsonsite. Relatedproducts FP4PortableFlocculator PortableflocculatorthatallowsstandardconditionstobeadoptedforJarTest.   FCSSeriesFlocculatorswithIndependentPositions Flocculatorswith4or6independentpositionsthatallowstandardconditionstobeadoptedforJarTest.  JLTSeriesFlocculators DigitalFlocculatorsin4and6positionswithtimerandilluminatedbackpanel toallowstandardconditionstobemetduringJarTesting.  Contactus Sendusamessage Contactoneofourspecialists,weareveryhappytohelpyou. Newsletter Subscribetoournewslettertostayupdatedonwhat'snewintheVELPworld.