constructed wetlands: an overview of the technology · filename.ppt 1’-6’ varying flow depths...

FILENAME.PPT

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

FILENAME.PPT

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

FILENAME.PPT

FILENAME.PPT

Present TreatmentApplications

Present TreatmentApplications

Municipal and Industrial WastewatersAcid Mine DrainageLandfill LeachatesAgricultural RunoffUrban Stormwater

FILENAME.PPT

FILENAME.PPT

BIOLOGICALBIOLOGICAL

PHYSICALPHYSICAL

through plants toroot zonethrough plants toroot zone

O2O2

CHEMICALCHEMICAL

TreatedWater

TreatedWater

PlantingSubstratePlanting

Substrate

InfluentInfluent

Contaminant Removal Mechanisms:Multiple Processes At Work

FILENAME.PPT

Specific Removal Processes

Specific Removal Processes

PHYSICALSedimentation

Filtration

Adsorption

Volatilization

CHEMICALPrecipitation

Adsorption

Hydrolysis

Oxidation/Reduction

BIOLOGICALBacterial Metabolism

Plant Metabolism

Plant Absorption

Natural Die-Off

FILENAME.PPT

Types of ContaminantsRemoved

Types of ContaminantsRemoved

Organic SubstancesNutrientsHeavy MetalsSuspended and Colloidal MaterialsPathogens

FILENAME.PPT

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

FILENAME.PPT

Marsh Pond Meadow

Rip-RapRip-Rap WetlandPlants

WetlandPlants

EffluentCollection

System

EffluentCollection

System

To Pond or Receiving System

To Pond or Receiving System

InfluentDistribution

System


SystemOrganic

SubstrateOrganic

Substrate

OutflowControl

Structure

OutflowControl

Structure

InflowControl

Structure

InflowControl

Structure

2”-12”Flow

Free Water Surface Wetland:Marsh Component

FILENAME.PPT

FILENAME.PPT

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

FILENAME.PPT

FILENAME.PPT

PlantingSurfacePlantingSurface

MeadowPlants

MeadowPlants

Weir

SaturatedWater LevelSaturated

Water Level

EffluentCollection

System

EffluentCollection

System

To Receiving SystemTo Receiving

SystemInfluentDistribution

System


System Mixed PorusMedia

Mixed PorusMedia

OutflowControl

Structure

OutflowControl

Structure

Flow

Marsh Pond Meadow

ImperviousBarrier

ImperviousBarrier

Free Water Surface Wetland:Meadow

FILENAME.PPT

FILENAME.PPT

Rip-Rap PlantingSubstratePlanting

SubstrateRip-Rap

Water Level

Hydraulic Gradient

EffluentCollection System

Water Level

To Receiving System

EffluentCollection System


SystemTo Receiving

System

Treatment Media(gravel, sand, soil)


System

OutflowControl

Structure

Treatment Media(gravel, sand, soil)

InflowControl

Structure

OutflowControl

Structure

InflowControl

Structure

Subsurface Flow Systems

FILENAME.PPT

FILENAME.PPT

CASE STUDIES

BASF, Williamsburg, VirginiaCity of Glen Cove, New York

CASE STUDIES

BASF, Williamsburg, VirginiaCity of Glen Cove, New York

FILENAME.PPT

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

!! Typical Zinc influent: 800 mg/LTypical Zinc influent: 800 mg/L!! Typical Zinc effluent: 0.10 to 1.5 mg/LTypical Zinc effluent: 0.10 to 1.5 mg/L!! Treatment Target Treatment Target -- 2.0 mg/L2.0 mg/L

!!Performance to Date: Performance to Date: ≥≥≥≥≥≥≥≥ 99.9%99.9%!! Flow range: 125,000 to 150,000 gpd Flow range: 125,000 to 150,000 gpd

!!Completed construction January, 1999Completed construction January, 1999

FILENAME.PPT

BASF, Williamsburg Pre-Construction PhotoBASF, Williamsburg Pre-Construction Photo

FILENAME.PPT

BASF, Williamsburg CW Site PlanBASF, Williamsburg CW Site Plan

FILENAME.PPT

BASF, WilliamsburgBASF, Williamsburg

FILENAME.PPT

BASF, WilliamsburgBASF, WilliamsburgBASF, Williamsburg

FILENAME.PPT


FILENAME.PPT

City of Glen Cove, New YorkStormwater Treatment Constructed Wetlands

City of Glen Cove, New YorkStormwater Treatment Constructed Wetlands

COCsCOCs::Typical Nitrogen Influent:Typical Nitrogen Influent:

Projected Nitrogen Removal:Projected Nitrogen Removal:Treatment Design Flow Rate:Treatment Design Flow Rate:

First Flush Hydraulic Retention Time:First Flush Hydraulic Retention Time:Hydraulic Design Flow Rate: Hydraulic Design Flow Rate:

Construction Completion Expected:Construction Completion Expected:

TSS, Nitrogen, Lead, and CopperTSS, Nitrogen, Lead, and Copper4.24 mg/l4.24 mg/l45 45 lbslbs/day/dayBase Flow = 8 Base Flow = 8 cfscfsFirst Flush = 25 First Flush = 25 cfscfs

12 Hours12 Hours450 450 cfscfsApril 2001April 2001

FILENAME.PPT

GLE

N C

OVE

AVE

.

PRATT BLVD.

GLEN COVE CREEK

GLEN ST.

HENDRICK AVE.

RTE. 107

RTE. 107

CHARLES ST.

10 ft x 8 ft Culvert

Twin 12 ft x 6 ftCulverts

ProposedPedestrianPath

Creek

L.I.R

.R.

STUDY AREA SITE PLAN

STUDY AREA SITE PLAN

300 FT

FILENAME.PPT

PRECONSTRUCTIONDebris Waste and Iron Stained Seep Area

PRECONSTRUCTIONDebris Waste and Iron Stained Seep Area

FILENAME.PPT

PRECONSTRUCTIONSeverely Eroded Hillside

PRECONSTRUCTIONSeverely Eroded Hillside

FILENAME.PPT

UNDER CONSTRUCTIONStop Log Structure and Diversion Channel

UNDER CONSTRUCTIONStop Log Structure and Diversion Channel

FILENAME.PPT

POST- CONSTRUCTIONCompleted Micropool

POST- CONSTRUCTIONCompleted Micropool

FILENAME.PPT

Advantages of ConstructedWetland Treatment SystemsAdvantages of ConstructedWetland Treatment Systems

Tolerant of fluctuating hydraulic and contaminant loading rates

Very low operation and maintenance costs

Easy to maintain

Can be designed to provide habitat enhancements and contaminant mitigation

Inexpensive to construct

Provide increased educational opportunities

FILENAME.PPT

Potential Disadvantages of Constructed Wetland Treatment Systems

Potential Disadvantages of Constructed Wetland Treatment Systems

Require relatively large land areas

Lack precise design criteria

Potential vector control concerns

constructed wetlands: an overview of the technology · filename.ppt 1’-6’ varying flow depths...

Documents