Dunwell-Water Reuse and 100% Indigo Dye Recovery-E

WaterReuseand100%IndigoDyeRecoveryusingVibratoryMembraneTechnologyinCottonJeansIndustry2011.05.19Copyright2011byDunwellEnviro-Tech(Holdings)Ltd.ChallengesinDyeingProcessWastewaterCODdischargeDyerecoveryWaterrecyclingWhichoneismoreimportant?Actually,theyareinter-related.Copyright2011byDunwellEnviro-Tech(Holdings)Ltd.DyeRecovery–Starting……Atypicaldyeingprocessofjeancottonfiber80%ofwastewatercomesfromwashingbathandcarryresidualdyeCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.DyeRecoveryResidualdyeContributewastewaterhighC.O.D.CostSomedyeismoreexpensivethanothersForjean,indigois$52/kgSulphurblackis$18/kgCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.Copyright2011byDunwellEnviro-Tech(Holdings)Ltd.Source:CentralTextileProcess:Pureindigo30%Puresulphurblack20%Firstindigo17.5%andthensulphurblack17.5%Firstsulphurblack7.5%andthenindigo7.5%47.5%ofindigorinsingwaterisnotmixedwithsulphurblackCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.DunwellconductedabenchtestIndigoDyeRecovery-ObservationsNochemicalisusedinseparationIndigoisoxidizedindyeingprocessRinsingwaterconcentration0.012gm/LIndigoislargemoleculewhilereducingagentandcausticaresmallmoleculesIndigoisheavierandcansettlebyitselfIndigocanadherebyitselfCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.VibratoryShearEnhancedProcessingCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.ConventionmembranehavethefoulingproblemVibratorymembraneeffectivelypreventfoulingproblemVibratoryMembraneCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.InsidetheFilterPackCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.WhyconsiderVibratoryMembraneTechnology?Anti-foulingusinghighvibratoryfrequencyLonglife,membraneupto3yearsSmallfootprint,only20m2Copyright2011byDunwellEnviro-Tech(Holdings)Ltd.IndigoDyeRecovery-ObservationsConcentratedindigodyecanbechemicallyreducedReducedRecoveredDye/ReducedVirginDyeCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.IndigoDyeRecovery-ObservationsRecoveredindigocanbereusedRecoveredDyeVirginDyeCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.IndigoDyeRecovery-ObservationsComparedifferentmembraneperformanceCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.IndigoDyeRecovery-ObservationsFiltrationflux35GFDCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.IndigoDyeRecovery-ObservationsSample(Feed/Permeate/Concentrate)Copyright2011byDunwellEnviro-Tech(Holdings)Ltd.Copyright2011byDunwellEnviro-Tech(Holdings)Ltd.ProposedProcessSchematicAsystemfor130m/daywasbuilt3Copyright2011byDunwellEnviro-Tech(Holdings)Ltd.i84P-UFROIndigoDyeRecovery-ResultTestDataCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.Indigo0.012g/L100%Flow130t/d6000L/hCOD133ppm,800g/hi84UF10.3kw97.5%2.5%RO4.0kwPUF2.2kw73.125%Flow4275L/hReuse24.375%Flow1425L/hCOD440ppm,627g/h1.25%Flow75L/hCOD56ppm,4.2g/hDischargeIndigo1.02g/L1.25%Flow75L/hReuseIndigoDyeRecovery–MembraneCleansingCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.FrequencyDurationWarmWaterDaily~0.5HourChemicalWashMonthly~0.5HourCleansingAgent:mildacidoralkalineRecoveredDyePerformanceisSuccessfulCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.SummaryIndigodyeissuccessfullyrecoveredbyVibratoryMembraneUFfiltrationtechnologyAftertwo-stageUFconcentrationThespentindigoisrecoveredandreusedbychemicalreducedWaterafterpHadjustmentPurifiedbyROmembraneandreturnedtorinsingbathCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.103tonnes/dayCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.Scale:138tonnes/dayindigodyerinsingwaterWaterIndigoSuccessfullyrecycle75%HKD471/daySuccessfullyrecycle1.76kg/dayHKD52/kgCOD2000/gHKD91.5/daySummaryConclusionRecoveredIndigodyewasproventobere-usableinthedyeingprocessRecoveredIndigodyeissuggestedtobemixedwithvirgindyetoachievenecessaryconcentrationindyeingbath(3~5g/L)Save6~10%IndigoDyeconsumptionNewGreenBranding“RecycledIndigoDyeJeans”Copyright2011byDunwellEnviro-Tech(Holdings)Ltd.WastewaterdischargefromajeanswashingplantCopyright2011byDunwellEnviro-Tech(Holdings)Ltd.Whatishappening……IsfashionabletobeGreen……Copyright2011byDunwellEnviro-Tech(Holdings)Ltd.Source: