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Discussion Topics
• Background – Why consider this project?
• Water Quality – Spatial and temporal variability
• Process Selection and Design
• Cost
• Resource Utilization Efficiency
• Conclusions
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Brackish Water Extraction & Treatment ProjectConceptual (diagrammatic – not to scale)
Brackish Water Extraction Well Field
PVPTP
Extraction well field is source of water & barrier to further SWI
Disposal of brine in SMP Brackish GW treatment for
agric use is simpler than for potable use
Flexible operation
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Dark Blue – salineLt Blue – brackishGray – slightly brackish to background
Lower part of UAS (~ Mugu aquifer)
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The “Rule”: Raw Water Quality and Finished Water Goals Determine the Process
Raw Water
Quality
Finished Water Goals
Reverse Osmosis
Treatment Process
Electrodialysis Reversal
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Raw Water Quality Data For Three Existing Wells Are Representative Of The Proposed Desalter Well Field Quality.
Raw Water Quality
Parameter *Composite Raw Water
Composite Worst Case Raw Water
Chloride (mg/L Cl-) 3,228 4,843Sodium (mg/L Na+) 1,077 1,615Sulfate (mg/L SO4
2-) 812 1,218Bicarbonate (mg/L
HCO3-)
246 369
Boron (mg/L B) 0.415 0.622TDS (mg/L) 6,426 9,639
pH 7.14 7.14
* Composite raw water comprised of Wells SW-195, CM7-190, and CM4-275; (Data from Nov. 2009 -Dec. 2013)
150% of Raw
Water
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Product Water Quality Goals Are Consistent With Local Agricultural Requirements.
Ideal Product Water Based on Agricultural Requirements
Parameter Units Criteria
Chloride mg/L < 50Sodium mg/L < 50Sulfate mg/L < 150
Bicarbonate mg/L < 150Boron mg/L < 0.8TDS mg/L < 600pH mg/L > 6.5 and < 7.0
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Desalting Technologies Be Categorized Into Three Types Of Processes
Reverse Osmosis (RO)Nanofiltration (NF)
Physical Membrane Process
Electrodialysis Reversal (EDR)
Electrically Driven Membrane Process
Distillation
Thermal Process
Not Practical for Brackish Groundwater
Not Competitive with RO Above 4,000 mg/L TDS
RO is proposed as the most appropriate treatment process for the South Oxnard Plain desalter facility.
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The RO Treatment Process Can Be Grouped Into Three Major Elements.
RO Pre-treatment RO Post-treatmentRO System
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Site Layout For 20,000 AFY
Facility
Sand Separators, Cartridge Filters, and RO Trains for
20,000 AFYFacility
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AWPF
Proposed Desalterand Well
Locations
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Proposed Desalterand Well Locations
AWPF
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Ocean
Sea Water
Fresh Water
Sea Level
PiezometricSurface
Ocean
Sea WaterFresh Water
Groundwater Pumping
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Ocean
Fresh Water
Groundwater Pumping Reduced
Brackish Groundwater Pumping
BWTP
Treated
Water
Sea Water
OceanSea
WaterFresh Water
Groundwater Pumping
Brackish Groundwater
Pumping
Sea Water
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AWPF
Conceptual Groundwater Flow
Paths
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Unit Water Cost Consistent With Other Projects With Similar Conditions
Desalter Plant Design Capacity, AFY 10,000 20,000
Capital Costs, $ $85,137,000 $147,966,000
Operating Costs, $ /AF $653-$821 $601-$733
Annual O&M with Capital Recovery, $/AF $1,111-$1,278 $998-$1,130
Add ~$100/AF for potable water quality
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Brackish Groundwater Plant on the South Oxnard Plain is Technically Feasible
Is there raw water available? Yes
Is a desalter technically feasible? Yes
Is there a viable waste brine disposal option? Yes
Are there customers for the treated water? Yes
Is the treated water cost a viable option for long-term water supplies? Yes
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ProsWater Supply
o Reliable new water source
o Sustainable sourceWater Quality
o Aquifer rehabilitationo Extraction barriero AG or potable WQ
GW Managemento In lieu rechargeo Direct recharge
Flexible operations
ConsMay induce sea
water towards well field (long term)Future blending may
be required (keep TDS in specific range)May impact WL &
WQ for some UAS wells near well field
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Next Steps?
Additional water quality analyses in potential area of wellfield (complete)
Grant research (in progress)Stakeholder outreach (in progress)
AG or Potable water quality Real estate for treatment plant and wellfield Exploratory test holes with water quality sampling
and analyses SCE Load Study CEQA
Solar ?
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PTP-PV Interconnections PTP-CAMROSA
Conejo CkInterconnection
PTP-BWTP Interconnection
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PTP-BWTP-AWPF Interconnection
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Aquifer Recharge – periods of low irrigation demand PTP-PV Delivery
PTP-PV Pump Station
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“Everything we know is only some kind of approximation, because we know that we do not
know all the laws as yet. Therefore, things must be learned only to be unlearned again or, more likely, to
be corrected."
[Richard Feynman, Nobel Prize Winning Physicist]
Questions ?