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. 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

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I 70 greenfield rest area constructed wetland wastewater treatment system research project

I-70 Greenfield Rest AreaConstructed 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



Design layout

AS-2

North

Rest

Stop

M-4

F-1

LS-4

LS-1

Effluent

Inflow

ST-2

ST-1

M-1

F-3

AS-1

LS-3

Recirculation

W-1

W-2

AS-4

W-3

Biofield

M-3

F-2

M-2

AS-3

LS-2

South

Rest

Stop

Lift station / dosing chamber

Septic tank

Automatic sampler

Wetland cell

V-notch weir

Magnetic flow meter

Design layout


Hydraulic issues
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


Flow measurements
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


I 70 greenfield rest area constructed wetland wastewater treatment system research project

6000

Inflow (M-1)

Outflow (M-4)

Flume 1

5000

Flume 2

Flume 3

4000

Daily Flow Total (gal)

3000

2000

1000

0

02/01

02/08

02/15

02/22

Date



I 70 greenfield rest area constructed wetland wastewater treatment system research project

Big Blue River

12000

450

Inflow (M-1)

Outflow (M-4)

Biofield (M-3)

10000

400

8000

350

Daily Flow Total (gal)

6000

300

Daily Streamflow (cfs)

4000

250

2000

200

0

150

02/01

02/01

02/08

02/08

02/15

02/15

02/22

02/22

02/29

02/29

03/07

03/07

Date




Current status
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


To do list
To-do list

  • Installation of SCADA system

  • Surge tank addition

  • Installation of weather station

  • Re-calibration of weir and flume meters