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Constructed Wetlands: An overview of the technology

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CONSTRUCTED WETLANDS:
An Overview of the Technology
Presentation For:

Peconic River Remedial Alternatives
Workshop
December 12 & 13, 2000
Presented by:

ROUX ASSOCIATES, INC.
Environmental Services and Management
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Walter H. Eifert
Principal Hydrologist

What Is A
Constructed Wetland?
Definition:
A designed and man-made complex of:
Saturated Substrates
Emergent and Submergent Vegetation
Animal Life
Water That Simulates Natural Wetlands
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Present Treatment
Applications
Municipal and Industrial Wastewaters
Acid Mine Drainage
Landfill Leachates
Agricultural Runoff
Urban Stormwater
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Contaminant Removal Mechanisms:
Multiple Processes At Work
O2 through plants to
2
root zone
zone

Planting
Substrate

Influent

PHYSICAL
PHYSICAL
BIOLOGICAL
BIOLOGICAL

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CHEMICAL
CHEMICAL

Treated
Water

Specific Removal
Processes
PHYSICAL

CHEMICAL

BIOLOGICAL

Sedimentation

Precipitation

Bacterial Metabolism

Filtration

Adsorption

Plant Metabolism

Adsorption

Hydrolysis

Plant Absorption

Volatilization

Oxidation/Reduction

Natural Die-Off

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Types of Contaminants
Removed
Organic Substances
Nutrients
Heavy Metals
Suspended and Colloidal Materials
Pathogens

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Types of Constructed Wetlands
1

Free Water Surface Systems
Marsh - Pond - Meadow Sequence

2

Subsurface Flow Systems
Engineered cells containing gravel,
soil and.or sand treatment media

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Free Water Surface Wetland:
Marsh Component
Marsh

Pond

Inflow
Inflow
Control
Control
Structure
Structure

Meadow

Rip-Rap
Rip-Rap

Flow

Influent
Influent
Distribution
Distribution
System
System
Organic
Organic
Substrate
Substrate

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Wetland
Wetland
Plants
Plants

Outflow
Outflow
Effluent
Effluent
Collection Control
Collection Control
System Structure
System Structure

2”-12”

To Pond or
To Pond
Receiving
System

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Free Water Surface Wetland:
Open Water Pond
Marsh

Pond

Meadow

Weir

Outflow
Outflow
Collection
Collection
System
System

Submergent
Submergent
Vegetation
Vegetation
1’-6’

Flow

Emergent
Emergent
Vegetation
Vegetation
Impervious
Impervious
Barrier
Barrier

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Outflow
Control

Varying
Depths

To Receiving
To
System

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Free Water Surface Wetland:
Meadow
Marsh

Pond

Meadow

Meadow
Meadow
Plants
Plants

Planting
Planting
Surface
Surface

Saturated
Saturated
Water Level
Wate...
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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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