I-70 Greenfield Rest Area Constructed Wetland Wastewater Treatment System Research Project
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I-70 Greenfield Rest Area Constructed Wetland Wastewater Treatment System Research Project (SPR-2455, SPR-2456, SPR-2487) R. S. Govindaraju, J. E. Alleman, T. J. Cooper, T. P. Chan, V. Jain School of Civil Engineering Purdue University
description
I-70 Greenfield Rest Area Constructed Wetland Wastewater Treatment System Research Project. (SPR-2455, SPR-2456, SPR-2487) R. S. Govindaraju, J. E. Alleman, T. J. Cooper, T. P. Chan, V. Jain School of Civil Engineering Purdue University. Project Location. Project Overview. - PowerPoint PPT Presentation
Transcript of I-70 Greenfield Rest Area Constructed Wetland Wastewater Treatment System Research Project
I-70 Greenfield Rest AreaConstructed Wetland Wastewater Treatment System Research Project(SPR-2455, SPR-2456, SPR-2487)
R. S. Govindaraju, J. E. Alleman, T. J. Cooper,T. P. Chan, V. Jain
School of Civil EngineeringPurdue University
April 21, 2023 2
Project Location
April 21, 2023 3
Project Overview
Surcharges by City Unique challenges
Long (3+ miles) sewer line to City POTW Low flush toilets; flow restrictive faucets High strength wastes (BOD, Ammonia)
Pretreatment using constructed subsurface wetlands Biofield (and city sewer) for effluent disposal
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Why Wetlands?
Conventional technologies Pros: proven technologies Cons: high capital and maintenance costs
Subsurface constructed wetlands Pros:
Low maintenance Aesthetic
Cons: Large footprint Lack of supporting data
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Wastewater Charateristics
High strength BOD~450 mg/L NH3~150 mg/L
Flow rate Design: 10,000 GPD Peak: >20, 000 GPD
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Treatment System Design
Features Functions/Benefits
2 10,000-gal septic tanks in series Primary treatment
2 parallel subsurface constructed wetlands (cells 1 & 2)~ alternately drained & filled~ 56 ft by 56 ft and 3 ft deep gravel beds with a peat moss top layer
Enhance oxygen transfer by constant draining and filling; thus promote nitrification and shorten designed hydraulic retention time
Recirculation of cells 1 & 2 effluent back to 2nd septic tank
Dilute high-strength wastewater; enhance mixing
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Treatment System Design (con’t)Features Functions/Benefits
Polishing plug-flow wetland (cell 3)
~ 20 ft by 40 ft and 2 ft deep
gravel beds with a peat moss
top layer
Provide further treatment; allow comparison between plug-flow and draw-and-fill flow regimes
Biofield
~ elevated sand mound
seeded with prairie grass
~ bed area: 333 sq ft; basal
area: 1652 sq ft
Denitrification; disposal of treated effluent via evapotranspiration and infiltration to subsoil.
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Instrumentations
Flow meters Magnetic flow meters for pressurized flow Flume and weir flow chambers with ultrasonic level sensors
for open channel (gravity) flows. Automatic samplers at various points of the system A weather station to measure rainfall, windspeed,
and temperature. Monitoring wells installed within the wetland cells
and also at the biofield.
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Design Schematic
Magn.FlowMeter-2
Level Sensor w/ Flume-2
Level Sensor w/ Flume-3
Magn.Flow Meter-3
Auto. Sampler-4
Auto.Sampler-1
Auto.Sampler-3
Auto.Sampler-2
Magn.Flow Meter-1
RestStopBuilding(North Side)
FromSouth Side
Septic Tank 1
Level Sensorw/ Weir-1
P
P
P
P
WetlandCell No. 1
WetlandCell No. 2
To CityWastewater
WeatherStation-1
WetlandCell No. 3
Magn. Flow Meter-*
Septic Tank 2Magn. Flow Meter-4
Biofield
WaterSoftenerBldg
PVCPipes
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1/17/2003
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2/19/2003
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4/15/2003
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6/5/2003
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6/5/2003
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7/10/2003
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7/10/2003
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7/30/2003
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8/12/2003
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8/12/2003
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9/25/2003
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9/25/2003
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9/25/2003
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9/25/2003
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Unfinished Items…
Installations of automatic samplers and weather stations
SCADA system Control, data logging and collection system Remote (web) access and control
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What’s next?
Startup When? How?
Startup procedures (provided by RQAW) Who?
INDOT responsibilities … Purdue responsibilities …
Long-term monitoring
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Research Activities
Dynamic model of the wetland hydraulics Alternate draw-and-fill scheme; time-varied inflow;
recirculation Model simulations
help formulate optimal managementstrategy
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Research Activities (con’t)
Survey to rest area operators compare and evaluate the proposed system to
existing treatment technologies Tracer tests Evaluation of the effectiveness of the system Development of design guidelines for
constructed wetland systems with specific application in rest area facilities.
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On the web
http://bridge.ecn.purdue.edu/~wetland
