CONSTRUCTED WETLANDS: An Overview of the Technology
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1 CONSTRUCTED WETLANDS: An Overview of the Technology Presentation For: Peconic River Remedial Alternatives Workshop December 12 & 13, 2000 ROUX ASSOCIATES, INC. Environmental Services and Management Presented by: Walter H. Eifert Principal Hydrologist FILENAME.PPT
2 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 FILENAME.PPT
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4 Present Treatment Applications Municipal and Industrial Wastewaters Acid Mine Drainage Landfill Leachates Agricultural Runoff Urban Stormwater FILENAME.PPT
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11 Contaminant Removal Mechanisms: Multiple Processes At Work O 2 through plants to root zone Planting Substrate Influent BIOLOGICAL PHYSICAL CHEMICAL Treated Water FILENAME.PPT
12 Specific Removal Processes PHYSICAL Sedimentation Filtration Adsorption Volatilization CHEMICAL Precipitation Adsorption Hydrolysis Oxidation/Reduction BIOLOGICAL Bacterial Metabolism Plant Metabolism Plant Absorption Natural Die-Off FILENAME.PPT
13 Types of Contaminants Removed Organic Substances Nutrients Heavy Metals Suspended and Colloidal Materials Pathogens FILENAME.PPT
14 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 FILENAME.PPT
15 Free Water Surface Wetland: Marsh Component Marsh Pond Meadow Inflow Control Structure Rip-Rap Wetland Plants Effluent Collection System Outflow Control Structure Flow 2-12 Influent Distribution System Organic Substrate To Pond or Receiving System FILENAME.PPT
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17 Free Water Surface Wetland: Open Water Pond Marsh Pond Meadow Weir Submergent Vegetation Outflow Collection System Outflow Control Emergent Vegetation Flow Impervious Barrier 1-6 Varying Depths To Receiving System FILENAME.PPT
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19 Free Water Surface Wetland: Meadow Marsh Pond Meadow Weir Meadow Plants Planting Surface Saturated Water Level Outflow Control Structure Flow Influent Distribution System Mixed Porus Media Impervious Barrier Effluent Collection System To Receiving System FILENAME.PPT
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21 Subsurface Flow Systems Inflow Control Structure Rip-Rap Planting Substrate Water Level Outflow Control Structure Influent Distribution System Treatment Media (gravel, sand, soil) Hydraulic Gradient Effluent Collection System To Receiving System FILENAME.PPT
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24 CASE STUDIES BASF, Williamsburg, Virginia City of Glen Cove, New York FILENAME.PPT
25 Designed and Currently Operate BASF, Williamsburg CW! COC s: Zinc, Iron, and Acidity! Typical Zinc influent: 800 mg/l! Typical Zinc effluent: 0.10 to 1.5 mg/l! Treatment Target mg/l! Performance to Date: 99.9%! Flow range: 125,000 to 150,000 gpd! Completed construction January, 1999 FILENAME.PPT
26 BASF, Williamsburg Pre-Construction Photo
27 BASF, Williamsburg CW Site Plan
28 BASF, Williamsburg
29 BASF, Williamsburg
30 BASF, Williamsburg
31 BASF, Williamsburg
32 BASF, Williamsburg
33 BASF, Williamsburg
34 BASF, Williamsburg
35 BASF, Williamsburg
36 BASF, Williamsburg
37 BASF, Williamsburg
38 BASF, Williamsburg
39 City of Glen Cove, New York Stormwater Treatment Constructed Wetlands COCs: Typical Nitrogen Influent: Projected Nitrogen Removal: Treatment Design Flow Rate: First Flush Hydraulic Retention Time: Hydraulic Design Flow Rate: Construction Completion Expected: TSS, Nitrogen, Lead, and Copper 4.24 mg/l 45 lbs/day Base Flow = 8 cfs First Flush = 25 cfs 12 Hours 450 cfs April 2001 FILENAME.PPT
40 GLEN ST. HENDRICK AVE. RTE. 107 RTE ft x 8 ft Culvert PRATT BLVD. Twin 12 ft x 6 ft Culverts CHARLES ST. GLEN COVE CREEK GLEN COVE AVE. FILENAME.PPT Creek Proposed Pedestrian Path L.I.R.R. STUDY AREA SITE PLAN 300 FT
41 PRECONSTRUCTION Debris Waste and Iron Stained Seep Area FILENAME.PPT
42 PRECONSTRUCTION Severely Eroded Hillside FILENAME.PPT
43 UNDER CONSTRUCTION Stop Log Structure and Diversion Channel FILENAME.PPT
44 POST- CONSTRUCTION Completed Micropool FILENAME.PPT
45 Advantages of Constructed Wetland Treatment Systems Inexpensive to construct Very low operation and maintenance costs Easy to maintain Can be designed to provide habitat enhancements and contaminant mitigation Tolerant of fluctuating hydraulic and contaminant loading rates Provide increased educational opportunities FILENAME.PPT
46 Potential Disadvantages of Constructed Wetland Treatment Systems Require relatively large land areas Lack precise design criteria Potential vector control concerns FILENAME.PPT
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