水资源可持续发展ppt课件

1、Sustainable Management of Water Resources in Urban AreasPerry L. McCartyStanford University Inha University1978INHA University World Class University Research TeamSustainability Using Wastewater as a ResourceWaterIndustryAgricultureDomestic Use Fertilizing nutrients (N&P)Energy Orange County Water D

2、istrict 2021 Wastewater Reuse (190,000 m3/d) Tertiary treatment using microfiltration, reverse osmosis,ultraviolet/peroxide treatmentHistorical Approach for Nutrient RecoveryTraditional Approach to Energy and Nutrient Recovery - Anaerobic Treatment to MethaneWhat is Best Reuse Option for Capturing A

3、ll of Wastewaters Resource Potential?Answer: Use for IrrigationIrrigation is a consumptive use best to use water for another purpose firstIrrigation is major consumer of waterQuality requirements less than for domestic reuseWastewater nutrients (N&P) need not be removed through energy-intensive proc

4、esses they are useful fertilizersWastewater energy potential can be saved through anaerobic treatment and distributed treatment systems Water Reuse for Agriculture in Monterey CountyMonterey Regional Water Pollution Control AgencyRecovers Water, Energy, and Nutrient ResourcesLargest irrigated crop w

5、astewater recycle in U.S.Produces 76,000 m3/day recycled water Irrigates 5,000 hectaresThrough anaerobic treatment and cogeneration, produces 50% of WWTPs energy needsNo energy wasted for nitrogen oxidation all is used as plant fertilizer Distributed versus Centralized TreatmentCentralized treatment

6、Cost effective for disposalTreated water often not located where neededDistributedBetter adapted for resource recoveryCan be large or small scaleExamplesSanitation Districts of Los Angeles CountySolaire and Dockside Green Apartments Sanitation Districts of Los Angeles County - Reuse by Surface Sprea

7、ding at Satellite PlantsWhittier Narrows Plant (1962) 57,000 m3/dSan Jose Plant (1971) 380,000 m3/dSolaire, New York, NYFirst Green Apartment Complex in USGreen Roof95 m3/day Membrane BioreactorCleaningMembranesTreatment Energy Requirements kWh/m3Conventional Aerobic Activated Sludge0.6Conventional

8、Aerobic with Nitrification0.8Aerobic Membrane Bioreactor1.0Conventional Aerobic with RO2.5 kWh/m3Wastewater Organics Potential1.9Wastewater Nitrogen Required to produce0.8Wastewater Energy ContentWhy dont we capture more of wastewaters energy content?Why do we use energy to rid wastewaters of nitrog

9、en? kWh/m3Wastewater Organics Potential1.9Wastewater Nitrogen Required to produce0.8Wastewater Energy ContentQuestionCan we treat municipal wastewater anaerobically to achieve net energy production while meeting effluent quality standards ?Anaerobic DigestionPrimaryTreatmentAnaerobic SecondaryTreatm

10、entMembraneFiltrationMethaneStrippingCogeneration (CHP)ElectricityHeatCleansedWaterWaste-waterMethaneAirSludgeHeatMcCarty, Bae, Kim, Environ. Science & Tech., in Press (2021) Assumed Domestic Sewage Componentmg/LChemical Oxygen Demand5005-Day Biochemical Oxygen Demand220Total Suspended Solids240Vola

11、tile Suspended Solids180Total Nitrogen 40Total Phosphorus 8Aerobic/Anaerobic MBR ComparisonMethane ProductionNet Energy ProductionMcCarty, Bae, Kim, Environ. Science & Tech., in Press (2021) Wastewater Biosolids Volume ComparisonsMcCarty, Bae, Kim, Environ. Science & Tech., in Press (2021) Anaerobic

12、 Fluidized Bed Reactor CharacteristicesGood mass transferLow clogging potentialCombines high SRT with low HRTGood for low strength wastewatersLidye Chemical Co., TaiwanTwo-Stage Anaerobic Fluidized Bed Membrane Bioreactor#Kim et al., Environ. Science & Tech., 45:576 (2021)Reactors Being Evaluated at

13、 Inha UniversityAnaerobicFluidizedMembraneBioreactor(AFMBR)InfluentWastewaterReclaimedWaterMembranesFluidizedGACTwo-Stage AFBR/AFMBR Results#Influent COD 500 mg/LOverall HRT 5.1 hr OLR 2.4 kg/m3-dCOD Removal 98%Effluent COD - 10 mg/LEffluent TSS 0 mg/LTotal Energy Required 0.06 kWh/m3Methane Energy

14、Produced 1.35 kWh/m3Suitable for agricultural reuse #Kim et al., Environ. Science & Tech., 45:576 (2021)ConclusionsWastewater reuse for agriculture and landscape irrigation is best approach for resource recoveryDistributed wastewater treatment system increases opportunity for resource recoveryAnaerobic treatment produces energy and reduces bio