FILENAME.PPT CONSTRUCTED WETLANDS: CONSTRUCTED WETLANDS: An Overview of the Technology An Overview of the Technology Presented by: Presented by: ROUX ASSOCIATES, INC. ROUX ASSOCIATES, INC. Environmental Services and Management Environmental Services and Management Presentation For: Peconic River Remedial Alternatives Workshop Walter H. Eifert Principal Hydrologist December 12 & 13, 2000
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CONSTRUCTED WETLANDS: An Overview of the Technology · FILENAME.PPT 1’-6’ Varying Flow Depths Emergent Vegetation Emergent Vegetation Submergent Vegetation Submergent Vegetation
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CONSTRUCTED WETLANDS: CONSTRUCTED WETLANDS: An Overview of the TechnologyAn Overview of the Technology
Presented by:Presented by:
ROUX ASSOCIATES, INC.ROUX ASSOCIATES, INC.Environmental Services and ManagementEnvironmental Services and Management
Presentation For:
Peconic River Remedial Alternatives Workshop
Walter H. EifertPrincipal Hydrologist
December 12 & 13, 2000
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What Is AConstructed Wetland?
What Is AConstructed Wetland?
Saturated Substrates
Definition:A designed and man-made complex of:
Emergent and Submergent Vegetation Animal LifeWater That Simulates Natural Wetlands
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Present TreatmentApplications
Present TreatmentApplications
Municipal and Industrial WastewatersAcid Mine DrainageLandfill LeachatesAgricultural RunoffUrban Stormwater
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BIOLOGICALBIOLOGICAL
PHYSICALPHYSICAL
through plants toroot zonethrough plants toroot zone
O2O2
CHEMICALCHEMICAL
TreatedWater
TreatedWater
PlantingSubstratePlanting
Substrate
InfluentInfluent
Contaminant Removal Mechanisms:Multiple Processes At Work
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Specific Removal Processes
Specific Removal Processes
PHYSICALSedimentation
Filtration
Adsorption
Volatilization
CHEMICALPrecipitation
Adsorption
Hydrolysis
Oxidation/Reduction
BIOLOGICALBacterial Metabolism
Plant Metabolism
Plant Absorption
Natural Die-Off
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Types of ContaminantsRemoved
Types of ContaminantsRemoved
Organic SubstancesNutrientsHeavy MetalsSuspended and Colloidal MaterialsPathogens
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Types of Constructed WetlandsTypes of Constructed Wetlands
Free Water Surface Systems
Marsh - Pond - Meadow Sequence
1
2 Subsurface Flow Systems
Engineered cells containing gravel, soil and.or sand treatment media
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Marsh Pond Meadow
Rip-RapRip-Rap WetlandPlants
WetlandPlants
EffluentCollection
System
EffluentCollection
System
To Pond or Receiving System
To Pond or Receiving System
InfluentDistribution
System
InfluentDistribution
SystemOrganic
SubstrateOrganic
Substrate
OutflowControl
Structure
OutflowControl
Structure
InflowControl
Structure
InflowControl
Structure
2”-12”Flow
Free Water Surface Wetland:Marsh Component
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1’-6’ VaryingDepthsFlow
Emergent Vegetation
Emergent Vegetation
SubmergentVegetation
SubmergentVegetation
OutflowCollection
System
OutflowCollection
System
ImperviousBarrier
ImperviousBarrier
OutflowControlOutflowControl
Marsh Pond Meadow
To Receiving SystemTo Receiving
System
Weir
Free Water Surface Wetland:Open Water Pond
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PlantingSurfacePlantingSurface
MeadowPlants
MeadowPlants
Weir
SaturatedWater LevelSaturated
Water Level
EffluentCollection
System
EffluentCollection
System
To Receiving SystemTo Receiving
SystemInfluentDistribution
System
InfluentDistribution
System Mixed PorusMedia
Mixed PorusMedia
OutflowControl
Structure
OutflowControl
Structure
Flow
Marsh Pond Meadow
ImperviousBarrier
ImperviousBarrier
Free Water Surface Wetland:Meadow
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Rip-Rap PlantingSubstratePlanting
SubstrateRip-Rap
Water Level
Hydraulic Gradient
EffluentCollection System
Water Level
To Receiving System
EffluentCollection System
InfluentDistribution
SystemTo Receiving
System
Treatment Media(gravel, sand, soil)
InfluentDistribution
System
OutflowControl
Structure
Treatment Media(gravel, sand, soil)
InflowControl
Structure
OutflowControl
Structure
InflowControl
Structure
Subsurface Flow Systems
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CASE STUDIES
BASF, Williamsburg, VirginiaCity of Glen Cove, New York
CASE STUDIES
BASF, Williamsburg, VirginiaCity of Glen Cove, New York
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Designed and Currently Operate BASF, Williamsburg CW
Designed and Currently Operate BASF, Williamsburg CW
!!COC’s: Zinc, Iron, and AcidityCOC’s: Zinc, Iron, and Acidity