application of process simulators and cfd to optimize ......intro sentence before bullets brown and...
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Application of Process Simulators and CFD to Optimize Process Capacity of WRRFsNovember 13, 2017
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Subsection Title or Presenters NameName of Presentation or Other Text
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• inCTRL SIMBA#• EnviroSim BioWin• 2Dc and 2Dr• ANSYS Fluent
• Dynamita SUMO• Hydromantis GPS-X• MIKE WEST• FLOW Science FLOW-3D• Hydraulic Modeling ???
Modeling Platforms
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Case Study #1:Lynchburg, VADate or speaker or subtitle
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Case Study #2:HRSD, Williamsburg, VADate or speaker or subtitle
Process Flow Diagram
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0
10
20
30
40
50
60
0 500 1000 1500
Efflu
ent S
uspe
nded
Sol
ids
(mg/
L)Time (min)
3.5 g/L - 77 SVI 4.0 g/L - 77 SVI 4.5 g/L - 77 SVI
3.5 g/L - 105 SVI 4.0 g/L - 105 SVI 4.5 g/L - 105 SVI
• 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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Case Study #3:Pueblo, COSIMBA#
INFLUENT
RETURN ACTIVATED SLUDGE (RAS)
WASTE ACTIVATED SLUDGE DAFGRAVITY THICKNER
ANOXIC
ANAEROBIC DIGESTER
CENTRIFUGE
PRIMARY SETTLER
SCREENGRIT REMOVAL
ARKANSAS RIVER
HAULING TO LANDFILL
UV DISINFECTION
DRYING BED
SLUDGE STORAGE
ANOXICANAEROBIC AEROBIC
NITRATE RECYCLE
Process Flow Diagram
Parameter Annual Median
95th
Percentile
TP 1.0 mg/L 2.5 mg/L
TIN 15 mg/L 20 mg/L
IMLR
IMLR
Primary Effluent
RAS
RAS
To Secodary Clarifiers
Anox
ic B
Anox
ic A
Anae
robi
c A
Anae
robi
c B
Pre-
Anx
BPr
e- A
nx A
Oxic
5
Oxic
6
Oxic
4
Oxic
3
Oxic
1
Oxic
2
Oxic
7
Oxic
8
Existing Biological Reactor Configuration
DO Probes
NH4 and NOx Probes
Existing DO Control Loops
DO ReactorDO Controller – Graded DeadbandFlow Control Valve Position f(DO)
DO Set-point
%FCV Setpoint
CMP Setpoint
Most Open Valve – LinearCMP Set-point f(%FCV of MOV)
Blower Speed Controller – PIDBlower Speed f(CMP)
%FCV Setpoint
Current CMP
Blower Switching Duty-Assist Combination f(Blower
Speed)
Min/Max Threshold Blower Speed
Current %FCV
FCV ControllerMaintains the %FCV Setpoint
Current %FCV
Air Distribution Control (8X)
Air Supply Control (1X)
Proposed AvN Control Loop
DO Reactor
SCFM Setpoint
DO Controller – PISCFM f(DO)
Airflow Controller – PIFlow Control Valve Position f(SCFM)
DO Setpoint
Current SCFM
%FCV Setpoint
FCV ControllerMaintains the %FCV Setpoint
Current %FCV
AvNAir Distribution Control
NH4 /NOx ReactorNH4 Controller – PIDDO f(NH4/NOx)
NH4 /NOx Set-point
CMP Setpoint
Most Open Valve – LinearCMP Set-point f(%FCV of MOV)
Blower Speed Controller – PIDBlower Speed f(CMP)
Current CMP
Blower Switching Duty-Assist Combination f(Blower
Speed)
Min/Max Threshold Blower Speed
Current %FCV
Air Supply Control (1X)
1X
8X
AvN Control LoopTo be added to the existing control structure
AvN Control LoopTo be added to the existing control structure
AvN and DO Control Loops
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
Case Study #4:MWS, Nashville, TNDate or speaker or subtitle
Table Sample
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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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Secondary Clarifier Testing
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MODEL INPUTS- Sludge Settling Characteristics - Discrete Settling Fractions
Comparison of Baffling Alternatives
RAS RAS
WWF
baffle
No baffle
vane
5x10 chimney 5x10
chimney
5x5 conduit with 10” openings
RAS
No baffle
WWF
Higher surface vel
and roll
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