1. Application of Process Simulators and CFD to Optimize Process Capacity of WRRFs
November 13, 2017

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3. BC SmartArt Color Sequence
Blue
158
209
Green
118
176 67
Light Gray
192
202
199
Orange
245
130 32
Gray
149
157
147
Purple 51 42
134
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5. Modeling Platforms inCTRL SIMBA# EnviroSim BioWin 2Dc and 2Dr
ANSYS Fluent
Dynamita SUMO
Hydromantis GPS-X
MIKE WEST
FLOW Science FLOW-3D
Hydraulic Modeling ???
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6. Case Study #1: Lynchburg, VA
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8. Case Study #2: HRSD, Williamsburg, VA
Date or speaker or subtitle

9. Process Flow Diagram
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10. Brown and Caldwell

11. Can pass 55 MGD peak hour flow
Do not need to consider plant expansion as part of Regional Wet-weather Management Plan
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12. Case Study #3: Pueblo, CO
SIMBA#

13. Process Flow Diagram Parameter Annual Median 95th Percentile TP
Pueblo is an AS plant in a Johannesburg BNR configuration. The main features are:
Primary clarifier for TSS and BOD removal
Anaerobic and Anoxic zones for both N and P removal (I am missing acetic acid addition)
Secondary clarification followed by UV disinfection before the final discharge
Solids are managed through anaerobic digestion.
Digested sludge is either dried or centrifuged and stored before being hauled to the landfill.
Parameter
Annual Median
95th Percentile TP
1.0 mg/L
2.5 mg/L
TIN
15 mg/L
20 mg/L

14. Existing Biological Reactor Configuration
DO Probes
NH4 and NOx Probes

15. Existing DO Control Loops Proposed AvN Control Loop

16. AvN and DO Control Loops

17. Modeling Aeration Control
AvN Modeling Summary
Parameters
Eff. TIN
Eff. TAN DO TP
Annual Median
5.2
2.6
0.4
0.6
Max Day
10.8
4.9
0.8
1.6
Min Day
1.84
0.92
0.22
0.25

18. Case Study #4: MWS, Nashville, TN
Date or speaker or subtitle

19. Table Sample South Grit Facility South Primary Clarifiers (13)
Tertiary Filters (abandoned) and South Chlorine Contact Tanks
North Chlorine Contact Tanks
North Primary Clarifiers (6)
Aeration Tanks(8)
North Secondary Clarifiers (8)
Intermediate Screw Pumping Station
North Grit Facility
South Grit Facility
South Primary Clarifiers (13)
South Secondary Clarifiers (6)
Excess Flow Treatment
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21. Secondary Clarifier Testing
MODEL INPUTS
- Sludge Settling Characteristics Discrete Settling Fractions
Brown and Caldwell | 8/2/2012

22. Comparison of Baffling Alternatives
WWF
vane
baffle
No baffle
No baffle
WWF
5x5 conduit with 10” openings
5x10 chimney
5x10 chimney
Higher surface vel and roll
RAS
RAS
RAS

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