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Protocol and Interactive Routine for the Design of Subsurface Bi i h MidBioreactors in the Midwest
Ri h d C kRichard CookeNatasha Bell
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DiversionStructure
Third Generation Bioreactors
Capacity5’ Soil Backfill
Length/width dependent on contributing area
p yControlStructure
Backfill
SectionSection of perforated tile
Woodchips
Trench bottom at thetile invert level
p
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5’ Soil backfill
Top View
5’ section of non-perforated tile
Capacity controlstructure
Diversionstructure
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Solid pipePlastic Liner
Perforated pipePerforated pipe
Solid pipe
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• Bioreactor design is a complex balance of flow rate and residence time.
Hi i h d d il d• Historic weather data, and soil and drainage system layout is used to
evaluate bioreactor performance within specified levels of uncertainty. p y
• Operational (stop log) settings are incorporated into the design procedure.
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Main Interface
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MS ControlsMS Controls
http://www.wq.illinois.edu/dg/
Sample Files
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Popup Help ScreensPopup Help Screens
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Contributing AreagBased on size and slopeBased on size and slope of outlet pipep p
sdA 5.067.2
3110nDc
Ac 311.0
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Contributing AreagBased on tile lengths andBased on tile lengths and intersection anglesg
2SIESLA
)cos(8SSLAc
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Contributing Areag
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Woodchip PropertiesWoodchip Properties
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Sizing CriteriagFlow rateFlow rate
Residence time
PerformancePerformance
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Design Flow Rateg10‐year, 24 hour drain10 year, 24 hour drain outflow eventoutflow event • Grassed waterwaysGrassed waterways
(NRCS‐412)
• Constructed wetlands (NRCS‐656)
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Design Flow RategDRAINMODDRAINMOD Sim lationsSimulations
• Weather• Soils• Drainage System Layout• Drainage System Layout
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Midwest Database
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NRCS Midwest DWM States
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EDF for Daily Flow
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Monthly Design Flowsg
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Performance Curve
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Illinois Performance CurveBIOREACTOR EFFICACY CURVE
Lake Decatur and Lake Bloomington WatershedsLake Decatur and Lake Bloomington Watersheds
Lr = 95 31Ld‐0.36180
90
100
(%)
Lr = 87.29Ld‐0.343
Lr = 95.31LdR² = 0.94
50
60
70
uctio
n Lr (
R² = 0.99
Lr = 95.42Ld‐0.435
R² = 0 4420
30
40
Load
Red
R = 0.44
0
10
0 5 10 15 20
Loading Density Ld ( Acres/100 sq.feet of the bioreactor)2008 2009 2010 2008 2008‐2009 2008‐2010
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Cost Analysisy
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Length/Width Effectsg /
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Length/Width Effectsg /
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Manual Optimizationp
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Automatic Optimizationp
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Incorporating Performance
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Report Generation
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Report Generation
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Future Work: Residence Time
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60 ft x 2.5 ft 40 ft x 3.5 ft
80 ft x 3.5 ft
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Preliminary Results
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Future Work: Nitrate Loads
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