Sludge Treatment in China

SludgeTreatmentinChinaChancesandChallengesBerlinwasserInternationalAGUweGyßerBerlin,13.September2007213.09.2007UweGyßerContent•BerlinPresentationofsludgetreatmentandsludgeutilizationintheCityofBerlin•ChinaInsightintothesludgetreatment&disposalsituationinChinaFuturechallenges•Firstguideonhowtofindthebestsolutionforsludgeutilization313.09.2007UweGyßerHarmfulsludgedisposal413.09.2007UweGyßerBerlin:PresentationofSludgeTreatmentandSludgeUtilizationintheCityofBerlin513.09.2007UweGyßerBerlin:OverviewDrainageAnnualwastewatertreatment231millionm³/aAveragedailytreatment712,000m3/dWWTP6Totallengthofsewer9,400kmWastewaterpipes4,206kmCombinedpipes1,908kmRainwaterpipes3,218kmPressuredpipes1,152Pumpingstations148Serviceareaapprox.800km2Dailysludgeproduction1,158m³/dwetsludge(20%-27%drysubstance)232t/dDS613.09.2007UweGyßerBerlin:OvervießerWWTPlantRuhlebenSludgeDewateringandIncinerationTechSpecsSludgeproductioninWWTP:_2,860m³/dwith3.5%drysubstance(DS)_370m³/dwith27%DSaftermechanicaldewatering_combustionofdewateredsludgeat850°CFinalwasteproduct:_30t/dash,utilizationinmining_7t/dplasterfromfluegasscrubbing,utilizationinconstructionindustry813.09.2007UweGyßerFlowchartRuhlebenWasteheatofcombustion_compressedairgenerationforactivatedsludgetank_generationelectricpower_substitutionofenergy:26%intheWWTPsofBerlin913.09.2007UweGyßerWWTPlantSchönerlindeSludgeDewateringandDryingTechSpecsSludgeproductioninWWTP:_914m³/dwith3.5%drysubstance(DS)_118m³/dwith27%DSaftermechanicaldewatering_sludgedryingat500°C(drumdryer)Finalwasteproduct:_34t/dgranules,utilizationingasificationplant1013.09.2007UweGyßerChinaInsightintothesludgetreatment&disposalsituationinChinaFuturechallenges1113.09.2007UweGyßerChina:SludgeTreatmentandDisposal•AmountofmunicipalsludgeinChina(2006):Approx.3.0milliontdrysubstance(Germany:2.5milliontDS)•InvestmentsinsludgetreatmentPortionofinvestmentinsludgetreatmentoftotalinvestmentinwastewatertreatment:China20–50%Europe50–70%•Planedinvestmentsinsludgetreatmentuntil2010:24.1billionRMB•Incasegovernmentgoalsfor2010areachieved(60%treatmentrateformajorcities):Approx.6.6milliontDSwillbeexpected.1213.09.2007UweGyßerGeograficalOverview–StatusQuoDisposalroutesCompostingLandfillingBricksmanufacturing,buildingmaterailssolardryingthermalDryingthermalDrying+IncinerationCo-incinerationinpowerplantagricultralUtilization,Recultivation,GreeningShenzhenDisposalrutilizationroutes1313.09.2007UweGyßerSludgeDisposalinChinaWaysofdisposalandutilization(2006*)Agricultural20,0%Composting2,0%Drying3,4%Co-Incineration4,1%Landscaping4,0%Landfill56,0%Wastedisposalsite10.5%*BWIEstimation1413.09.2007UweGyßerChallenges•OnlytheminorityofChinesecitieshavesustainablesludgedisposalorutilizationroutes•Acceptanceforagriculturaluseandlandfillisdiminishing•Sludgeamountwillincreasebyatleast15%annuallyuntil2010.•Tighterregulationsforsludgedisposalinpreparation(effectiveend2007)Sludgeforgardeningandforests:watercontent45%Sludgeforlandfill:watercontent60%Mixingratiowithdomesticwaste:8%1513.09.2007UweGyßerFirstGuideonhowtofindthebestsolutionforSludgeUtilization1613.09.2007UweGyßerPrincipleGuidelineBestsolutionutilization(drying,constructionmaterial,incineration,agriculture)Secondbestsolutiondisposal(landfill)WastewatertreatmentSludgetreatmentAdvancedSludgeTreatmentandUtilization20%DSNewfacilityWhichtechnology?1713.09.2007UweGyßerSludgeTreatmentTechnologyProcessSelectionCriterion:CharacteristicsofsludgefromwastewatertreatmentplantsSize(sizeofWWTPandamountofsludge)Possiblewaysofdisposal(landfill,incineration)Possibleproducts(cementindustry,bricksmanufacturing,…)Legal/environmentalrequirementsandregulationsLocationofsludgetreatmentplant(centralized/decentralized)1813.09.2007UweGyßerWastelandfillSludgeTreatmentTechnologiesmechanicaldewatering(70–80%watercontent)agriculturaluseIncinerationSludgelandfillAshlandfillwasteincinerationorpowerplantDrying10%watercontentUseintheconstructionmaterialindustryRawSludgeBiologicalstabilizationandconditioningWastedisposalsitePartialdrying40-50%watercontent1913.09.2007UweGyßerLessonslearnt•Developmentfromsludgedisposaltosludgeutilizationnecessary•NewPlantsforsludgeutilizationarerequired•Combustionofwetsludgecanbeacost-effectiveutilizationroute•CombinationofdryingandcombustionfollowsthetrendoftechnicaldevelopmentinindustrialcountriesandstandsforasustainableandflexiblesolutionFlexibleforchangesinlawsandregulationsReuseofenergySeveraloptionsofutilization2013.09.2007UweGyßerDiscovertheWorldofWater