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I-70 Greenfield Rest Area Constructed Wetland Wastewater Treatment System Research Project. R. S. Govindaraju, J. E. Alleman, T. J. Cooper, T. P. Chan, V. Jain School of Civil Engineering Purdue University (SPR-2455, SPR-2456, SPR-2487). March 19, 2004. Project location. AS-2. North - PowerPoint PPT Presentation
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R. S. Govindaraju, J. E. Alleman, T. J. Cooper,R. S. Govindaraju, J. E. Alleman, T. J. Cooper,T. P. Chan, V. JainT. P. Chan, V. Jain
School of Civil EngineeringSchool of Civil EngineeringPurdue UniversityPurdue University
(SPR-2455, SPR-2456, SPR-2487)(SPR-2455, SPR-2456, SPR-2487)
I-70 Greenfield Rest AreaI-70 Greenfield Rest AreaConstructed Wetland Constructed Wetland Wastewater Treatment Wastewater Treatment System Research ProjectSystem Research Project
March 19, 2004March 19, 2004
April 21, 2023 2
Project location
April 21, 2023 3
ST-2 ST-1
W-1 W-2W-3
Bio
fiel
d
F-2
AS-3
AS-2
AS-1
AS-4
F-3
F-1
M-1
M-2
LS-2
LS-1
LS-3
LS-4
M-3
M-4
EffluentInflow
Septic tank
Automatic sampler
V-notch weir
Lift station / dosing chamberMagnetic flow meter
Wetland cell
Rec
ircu
lati
on
North RestStop
South RestStop
Design layout
April 21, 2023 4
Hydraulic issues
Undersized wetland dosing pumps (LS-1) Surges from the eastbound side High rate of recirculation (~83%)
Solutions Reduce recirculation rate Addition of surge tank
April 21, 2023 5
Flow measurements
Weir / flume measurements are NOT accurate Backup due to overcapacity of LS-1 and LS-4 Inadequate calibration Inherent error due to low flows
Magnetic flow meters More reliable Erroneous spikes in the data
April 21, 2023 6
02/01 02/08 02/15 02/220
1000
2000
3000
4000
5000
6000
Date
Da
ily F
low
To
tal (
ga
l)Inflow (M-1)
Outflow (M-4)
Flume 1
Flume 2
Flume 3
April 21, 2023 7
9/25/2003
April 21, 2023 8
02/01 02/08 02/15 02/22 02/29 03/070
2000
4000
6000
8000
10000
12000
Date
Da
ily F
low
To
tal (
ga
l)Inflow (M-1)
Outflow (M-4)
Biofield (M-3)
02/01 02/08 02/15 02/22 02/29 03/07150
200
250
300
350
400
450
Da
ily S
tre
am
flow
(cf
s)
Big Blue River
April 21, 2023 9
Wastewater test results 12/22/2003
Sample pHTSS
(mg/L)NH3-N(mg/L)
BOD5
(mg/L)
Sampler #1 8.80 110 83 280
Sampler #3 8.24 60 62 225
Sampler #4 8.17 60 65 215
April 21, 2023 10
Wastewater test results 3/5/2004
Sample pHTSS
(mg/L)NH3-N(mg/L)
BOD5
(mg/L)
Sampler #1 8.40 140 136 310
Sampler #2 7.94 110 122 294
Sampler #3 7.72 60 131 310
Sampler #4 7.65 60 80 226
April 21, 2023 11
Current status
Only receiving wastewater from west-bound side
No recirculation Flow-through with no drain-and-fill Biofield shut down till desired effluent quality
is attained
April 21, 2023 12
To-do list
Installation of SCADA system Surge tank addition Installation of weather station Re-calibration of weir and flume meters
