DAVID W. SLOAN P.E. , BCEE
Transcript of DAVID W. SLOAN P.E. , BCEE
Potable Reuse in the Permian BasinDAVID W. SLOAN, P.E., BCEE, ,
July 28, 2011
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Colorado River Municipal Water District
MEMBER CITIES:OdessaBig Spring Snyder
28 County CRMWDOperational AreaCONTRACT
CITIES:CITIES:MidlandSan AngeloAbil
Robert LeePyoteG df ll
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AbileneStanton
Grandfalls
Project Background• Drought – 15 years . . .
– Lake Thomas – 2.62% full– Lake Spence – 0.69% full– Lake Ivie – 23.61% full
• Seeking new sustainable sources• Much treated WW effluent unusedS d i d b i i• System dominated by transmission costs– high lift & long distance– high lift & long distance
• Reuse Goal: 100 % of water, 100% of the timeof the time
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Colorado River Municipal Water District Transmission System
Snyder
Big Spring
Odessa
Big Spring
Odessa
Midland
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Unplanned Indirect Potable ReuseP
City B
Reclaim
WTPWWTP
ReclaimTreatmentWTP
City A
WWTP
y
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CRMWD Raw Water Production Concept
Reclaim WTPTreatment
WTPReclaimTreatment
Cit A
City BWWTP
WWTP
City A
WWTP
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Why Direct Blending ?
• Year‐round Production & Usage
• Few large customers for non‐potable reuse
• Low‐density developmenty p
– Blending uses existing pipelines
• Arid conditions limited landscapingArid conditions, limited landscaping
• High dissolved solids; desalination required for reuse
– Blending maximizes benefit of desalination
• Evaporation losses diminish stored waterp
– Inline blending minimizes evaporationTAWWA/WEAT San Antonio Summer Seminar
Project Development
• Feasibility Study – 2005
• Member City Agreement Negotiated
• Preliminary Design Report 2007• Preliminary Design Report – 2007
• Membrane Prequalification
• Membrane Pilot Testing – 2009
• Membrane Selection & Final Design ‐ 2010
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Wastewater TreatmentTreatment Sequence
D hl i tiWastewater Treatment
Screening
Primary Clarifiers
Final Clarifiers
Aeration Basins
FiltersDechlorination
Chlorination
Thom
Spen
Reverse Membrane
mas Pipeline
ce Pipeline
H2O2
Reverse Osmosis
Membrane Filtration
O id i
e e
Raw Water Reservoir Reclaim Treatment
UV Oxidation
Water Treatment
Rapid
Sedimentation Basins
Filters
Rapid Mix
Flocculators
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Water Quality Results (Pilot Study)
Conc.(mg/l)
Source Water(WWTP Effluent)
Membrane Filtrate (1st Stage)
RO Permeate(2nd Stage)
Spence Pipeline (RawWater)(mg/l) Effluent) (1st Stage) (2nd Stage) (Raw Water)
TDS 3400 57 2540
Chlorides 1370 17 928Chlorides 1370 17 928
Sulfates 776 0.7 592
Nitrate 10 7 0 84 <0 05
(as N)10.7 0.84 <0.05
TOC 11.9 12.5 <0.9 12
TTHMs 0.087
Hardness (as CaCO )
915 <5 700(as CaCO3)
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Concentrate Disposal
• General Disposal Alternatives– Evaporationp
– Discharge
– Disposal WellDisposal Well
– Conjunctive Use: Oil/Gas Operations
– Zero Liquid DischargeZero Liquid Discharge
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Regulatory Consultations/Approval
• Texas Commission on Environmental Quality (TCEQ)– Supportive of project
– Protective of Finished Water Quality
• Reclaimed Water Use Authorization (Big Spring/TCEQ)– Transfer of Effluent from WWTP
– Not “reclaimed” after membrane treatment
h ( / )• Concentrate Discharge Permit (CRMWD/TCEQ)
• Industrial Pretreatment Permit (CRMWD/Big Spring)
• Membrane Pilot Study (TCEQ)
• Plans & Specs Review (TCEQ)
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TCEQ Conditions
• Alternate Source Water Approval
N tifi ti f R i i W t S t– Notification of Receiving Water Systems
– Source Description included in CCR
A d M b Fl Pil d R• Approved Membrane Flux at Piloted Rate
– Effluent Quality Monitored Continuously
– Turbidity and Chlorine Residual Req’ts
– Direct and Indirect Integrity Monitoring
• Inspection and Monitoring as Public Water Source (Drinking Water)
• Clarification of criteria applicability
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Sustainability & Energy Use
• Reclamation Processes are energy‐intensive– Membrane Filtration
– RO Desalination
– UV Disinfection & OxidationUV Disinfection & Oxidation
• Existing Sources also energy‐intensiveLake Spence to Big Spring: 56 miles– Lake Spence to Big Spring: 56 miles
– Vertical Lift: 692 feet
R l i ill id• Reclamation will avoid:– Raw water lift from Lake Spence
– Effluent diversion to Red Draw Reservoir
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Pumping Distance and Vertical Lift
Elevation, ft.
166 mi. @ 1405 ft.
92 mi. @ 696 ft.i @ 3 6 f
120 mi. @ 1068 ft.
3000Odessa
56 mi. @ 692 ft.
45 mi. @ 356 ft.
2600Big SpringWard Co.
Wells
@
2200Lake J.B. Thomas
Snyder
1800E.V. Spence Reservoir
1500O.H. Ivie Reservoir
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Energy Comparison
Big Spring Reclamation
Operation kWh/
Current Operation
Operation kWh/Operation kWh/1000 gal.
Membrane Treatment 3.55
Operation kWh/1000 gal.
RawWater Pumping 4.2UV Oxidation 0.39
Source Water & Product Water Pumping
1.4
p g(Spence to Big Spring)
Beals Creek Diversion 0.84
b dCombined 5.34 Combined 5.04
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Public Information & Acceptance
• District’s approach – Direct & Simple
M lti l t iti f i f ti• Multiple opportunities for information
– 2 Public Meetings
– Radio interviews with call‐in
– Newspaper articles
– Internet
• Water scarcity and high chlorides apparent
Muted response – positive to neutralTAWWA/WEAT San Antonio Summer Seminar
Project Facts
• Facility Capacity: – 2.5 MGD in → 1.85 MGD out→
• Spence pipeline – up to 15% reclaimed water
Product Tank
– up to 15% reclaimed water
• Construction Cost: $12 illi– $12 million
SourceTank
Break Tank
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Conclusions
• Required technology reliable and mature
M lti l b i i l• Multiple barriers crucial
• Regulatory and stakeholder hurdles take time
– start early!
• Public not always opposedy pp
• Result can be high utilization of effluent
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