sue lawrence:
TRANSCRIPT
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Location
HISTORY
Built in 1967
Upgraded 9 times
Limited room for expansion!
Existing facility borders:
Commercial Area
Bridge entrance to the City
La Center Bottoms Wetland
Public Park and Amphitheater
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2010 MBR Constructed
DESIGN INFORMATION
Current – $11.7 Mill 0.69 MGD Max Month (Membranes – 0.84 MGD)1.29 Peak Day (Membranes – 1.68 MGD Peak Day)
Phase 1B – $1.95 Mill, 1.04 MGD Max Month (Membranes – 1.68 MGD) 1.94 MGD Peak Day (Membranes – 3.36 MGD Peak Day)
Phase 2 would be for solids and it is estimated at $3.9 MillionPhase 3 – est $8.7 Million
2.25 MGD Max Month (Membranes – 3.36 MGD)4.20 MGD Peak Day (Membranes – 6.72 MGD Peak Day
Small Foot Print20 year at 8.7% growthReliability & FlexibilityKennedy/Jenks Consultants, Portland, OR
Preselection of MBR – Enviroquip/Kubota Flat Plate Currently OVIVOwater
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Upgrades
TOP 5 UPGRADES
The plant was built to be energy efficient
Raised headworks for gravity flow into the plant
Phased the expansion by only filling two MBR basins
Utility water converted from Potable water
Combined old and new SCADA into one system
New Headworks - Two Rotary Drum Screens - 6.0 MGD 3 mm
Pump Assisted Gravity
Phased Expansion
Utility Water System
SCADA System
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LA CENTER PROCESS SCHEMATIC – EXISTING AND FUTURE
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T h e L a C e n t e r w a s t e w a t e r T r e a t m e n t P l a n t
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Influent Quality
COMPARING SBR TO MBR
The Plant Flows and Loads were similar during the evaluation for both the Sequencing Batch Reactor and the all four years as an Membrane Bioreactor
The SBR was started in 2004, so it was less than 3 years old at the time of this study
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Challenges
TOP 5 CHALLENGES
Growth dropped from 8.7 % to less than 1%
City Council requested a 10% reduction in expenditures
Casino Resort not constructed (0.5 MGD)
Programming was not flexible
Could not reduce volume of system
Growth Rate Reduced
Dewatered Solids
Energy Usage
Programming
Valve Placement Reduced Flexibility
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Optimization
TOP 5 OPTIMIZATION STRATEGIES
Couldn’t take one process train completely offline without removing one MBR Basin
Forced only one MBR to run during regular flows. Higher flows required both
Worked With OVIVO to have someone look at the programming to make it more efficient
Take Equipment Out of Service
Only Operate at Medium or High Flow Rates
Tune Control Loops
Program in Flexibility
Inspect and Clean Diffusers
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Effluent Quality
DISCHARGE CHARACTERISTICS
When we changed from the SBR to the MBR we realized
a 92 % reduction in the pounds of Total Suspended
Solids and 57 % reduction in the pounds of BOD
discharged to the receiving stream.
The Biosolids production dropped dramatically. We
produce 32% fewer pounds with the MBR than we could
with the SBR.
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Actual Expenses
OPEXs
Two year average of Operation and Maintenance
expenses Not including labor expenses
Before optimization - MBR was over 13% less to
operate
In 2013-2014,we increased the savings to 19%
compared to the SBR
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The standard flow-based control equation for permeate set point: – Fout = (Fin x Rf) x [Fm + (0.3 x Fc) x (Li-Le)/(Lh-Ll)]
• Fout = process train calculated flow set point• Fin = time averaged influent flow divided by number of online trains• Rf = [(Relax Freq – Relax Duration ) / Relax Freq ] -1• Fm = meter correction factor, 0.85 to 2.0• Fc = gain for level correction, 0.85 to 2.0• Li = average or individual controlling basin level• Le = desired equilibrium level• Lh = high flow level set point• Ll = low flow level set point
This was not intuitive to figure out how changes in the settings would affect the flow settings.
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Program ChangeLooks at incoming flow and at the difference in the basin level.
• If Li <= Lw, then dflow = ((Li - Le)* Vpa)/10• If Li > Lw, then dflow = (((Lw - Le)* Vpa) + ((Li - Lw) * Vtot)/10 min)
= ( +(dflow*0.3))*
Fout Calculated permeate flow set point in gpmFin Time averaged influent flow in gpm Rf [(Relax freq – Relax duration) / Relax freq ] – 1 (1.11)Li Average or individual controlling basin level, ftLe Target Level, ft (Set by Operator)Lw Weir Level, ft (Set by Operator)Vpa Volume Aerated basins, gal/ft (Set by Operator)
Vtot Volume Aerated basins, gal/ft (Set by Operator)
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Areas of Usage
Evaluated 5 sections of electrical use
2011 – 2012Baseline for MBR - $65,731 2014 – Current - $58,781
2015 – Goal - $54,660
MBR Electrical Use
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Flux Rate
Current Minimum Flow Rate is 160 gpm/header
Increasing the minimum flow rate to 180 gpm and increasing the maximum level in the process basins can increase the plant efficiency
MAXIMUM INSTANTANEOUS AND AVERAGE DAILY FLUX RATES
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MBR Air Scour Electrical costs
Baseline 2011-2012
Optimized 2013-2014
Goal 2015
MBR Air Scour Electrical CostBaseline, Current and Goal for MBR Air Scour electrical