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

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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 Brown and Caldwell

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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

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

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

Process Flow Diagram Brown and Caldwell

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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

Case Study #3: Pueblo, CO SIMBA#

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

Existing Biological Reactor Configuration DO Probes NH4 and NOx Probes

Existing DO Control Loops Proposed AvN Control Loop

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, TN Date or speaker or subtitle

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 Brown and Caldwell

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Secondary Clarifier Testing MODEL INPUTS - Sludge Settling Characteristics - Discrete Settling Fractions Brown and Caldwell | 8/2/2012

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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