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

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

2 DRAFT: Icon is Optional Date or speaker or subtitle

3 BC SmartArt Color Sequence Blue Green Light Gray Orange Gray Purple Brown and Caldwell 3

4 Name of Presentation or Other Text Subsection Title or Presenters Name Brown and Caldwell 4

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??? Brown and Caldwell 5

6 Case Study #1: Lynchburg, VA Date or speaker or subtitle

Intro Sentence Before Bullets To change the slide layout (grid) or to change the color of the top bar: Select the slide thumbnail along the left side.

7 Intro Sentence Before Bullets To change the slide layout (grid) or to change the color of the top bar: Select the slide thumbnail along the left side. Right Click and go to Layout Choose the corresponding color and/or layout to apply to the slide. Avoid using the Design tab to change layouts or color themes, there is an application bug that causes PowerPoint to crash. Brown and Caldwell 7

8 Case Study #2: HRSD, Williamsburg, VA Date or speaker or subtitle

9 Process Flow Diagram Brown and Caldwell 9

60 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.

10 g/l - 77 SVI 4.0 g/l - 77 SVI 4.5 g/l - 77 SVI 3.5 g/l SVI 4.0 g/l SVI 4.5 g/l SVI Effluent Suspended Solids (mg/l) Time (min) Brown and Caldwell 10

11 Can pass 55 MGD peak hour flow Do not need to consider plant expansion as part of Regional Wet-weather Management Plan Brown and Caldwell 11

12 Case Study #3: Pueblo, CO SIMBA#

13 Process Flow Diagram NITRATE RECYCLE PRIMARY SETTLER GRIT REMOVAL SCREEN UV DISINFECTION INFLUENT ANAEROBIC ANOXIC AEROBIC ARKANSAS RIVER RETURN ACTIVATED SLUDGE (RAS) ANOXIC GRAVITY THICKNER DAF WASTE ACTIVATED SLUDGE CENTRIFUGE ANAEROBIC DIGESTER DRYING BED SLUDGE STORAGE HAULING TO LANDFILL Parameter Annual Median 95 th Percentile TP 1.0 mg/l 2.5 mg/l TIN 15 mg/l 20 mg/l

14 Existing Biological Reactor Configuration IMLR Primary Effluent RAS Pre- Anx B Pre- Anx A Anaerobic A Anaerobic B Anoxic B Anoxic A Oxic 5 Oxic 4 Oxic 1 Oxic 6 Oxic 3 Oxic 2 To Secodary Clarifiers DO Probes NH4 and NOx Probes RAS Oxic 7 Oxic 8 IMLR

15 Existing DO Control Loops Proposed AvN Control Loop Air Distribution Control (8X) DO Set-point AvN Air Distribution Control NH4 /NOx Set-point DO Controller Graded Deadband Flow Control Valve Position f(do) %FCV Setpoint FCV Controller Maintains the %FCV Setpoint DO Reactor Current %FCV 1X NH4 Controller PID DO f(nh4/nox) DO Setpoint DO Controller PI SCFM f(do) SCFM Setpoint NH4 /NOx Reactor DO Reactor 8X Airflow Controller PI Flow Control Valve Position f(scfm) Current SCFM Air Supply Control (1X) Most Open Valve Linear CMP Set-point f(%fcv of MOV) CMP Setpoint Blower Speed Controller PID Blower Speed f(cmp) Current %FCV Current CMP %FCV Setpoint FCV Controller Maintains the %FCV Setpoint Air Supply Control (1X) Most Open Valve Linear CMP Set-point f(%fcv of MOV) CMP Setpoint Blower Speed Controller PID Blower Speed f(cmp) Current %FCV Current %FCV Current CMP Blower Switching Duty-Assist Combination f(blower Speed) Min/Max Threshold Blower Speed Blower Switching Duty-Assist Combination f(blower Speed) Min/Max Threshold Blower Speed

16 AvN and DO Control Loops AvN Control Loop To be added to the existing control structure

17 Modeling Aeration Control AvN Modeling Summary Parameters Eff. TIN Eff. TAN DO TP Annual Median Max Day Min Day

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

Table Sample South Grit Facility Intermediate Screw Pumping Station Excess Flow Treatment North Grit Facility Tertiary Filters (abandoned) and South Chlorine Contact Tanks North

19 Table Sample South Grit Facility Intermediate Screw Pumping Station Excess Flow Treatment North Grit Facility Tertiary Filters (abandoned) and South Chlorine Contact Tanks North Chlorine Contact Tanks North Primary Clarifiers (6) South Secondary Clarifiers (6) North Secondary Clarifiers (8) Brown and Caldwell South Primary Clarifiers (13) Aeration Tanks(8) 19

20 Brown and Caldwell 20

21 Secondary Clarifier Testing MODEL INPUTS - Sludge Settling Characteristics - Discrete Settling Fractions Brown and Caldwell 8/2/

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

23 Title Page: Icon is Optional Date or speaker or subtitle

24 Fun new elements to incorporate in your slides Callout for emphasis Brown and Caldwell 24

25 Callout for emphasis

26 Brown and Caldwell 26