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Transcript of American Society of Farm Managers & Rural Appraisers Kevin Morrison, P.G. Project Coordinator –...
American Society of Farm Managers & Rural Appraisers
Kevin Morrison, P.G.Project Coordinator – Desalination Engineering
Brackish Groundwater Desalination Program Update
October 2, 2014
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 2
Outline• Background
• Treatment Process
• Program Progress
• Program Cost
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 4
SAWS Water Supply - 2014No Cutbacks
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 5
What is Brackish Groundwater?• Brackish groundwater
contains total dissolved solids (TDS) greater than 1,000 milligrams per liter – Fresh: 0 – 1,000 mg/l– Edwards: 350 – 400 mg/l – Brackish: 1,000 – 10,000
mg/l– Saline: greater than 10,000
mg/l– Seawater: greater than
35,000 mg/l
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 6
Why Brackish Desalination?
• Untapped resource
• Large volumes of available brackish water– Estimated over 2.7 billion
acre-feet
• Resource close to San Antonio
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 8
Carrizo – Wilcox Cross Section
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 9
Production WellsInitial Test
WellsProduction Wells
(8)Depth 1250 - 2660 1205 - 1770
Production Rate (gpm) 800-1000 800 -1100
Total Dissolved Solids (mg/L)
1437 1346
Iron (mg/L) 0.233 0.314Silica (mg/L) 18.8 18.5
Water Chemistry
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 10
Membrane Pilot Testing
• Receive TCEQ capacity rating and permit
• Test membranes from three manufacturers
• Test pre-treatment/post treatment options– “Open System” vs. “Closed System”
• Additional Investigations– Concentrate Pipe Loop Study
– Air Leak Testing
– System fouling trend and membrane autopsy SAWS Membrane Pilot Test Unit
Pilot Testing Goals
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 11
Current BGD Program • Phase I (2016)
o 12 MGD or 13,440 Acre-feet/yr
• Phase II (2021)o 12 MGD or 13,440
Acre-feet/yr
• Phase III (2026)o 6 MGD or 6,720 Acre-
feet/yr
• Totalo 30 MGD or 33,600
Acre feet/yr
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 13
Diagram by Osmonics, Inc.
Reverse Osmosis Membrane Construction
RO Treatment
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 14
RO Treatment
Acid
CF
AS
Calcite Contactor,Degasification,Sodium hydroxide
Product
WellConcentrate Disposal
Raw Water Blending
RO
Concentrate
Pre-treatment
Primary treatment
Post treatment
AS: Anti-scalent CF: Cartridge Filter
13
.11
MG
D2
MG
D
10 MGD
1.1
1 M
GD
11
.11
MG
D
12 MGD
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 15
What is Concentrate/Brine• Reverse osmosis treatment plant produces
two products– 90% permeate (30-60 mg/L TDS)– 10% concentrate (~15,000 mg/L TDS)
• Concentrate stream requires disposal
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 16
Concentrate DisposalOptions Considered
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 17
Class I Test Injection WellPerforated Versus Open Hole Completion
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 18
Injection Zone
~ 860 ft. Thick
Confining Zone
~ 2,360 ft.Thick
Production Zone ~ 600 ft.
Thick
GeorgetownEdwards &
Upper Glen RoseLimestone
Midway Shale
AnacachoLimestone
Navarro Clay
Wilcox Sand(Brackish Water)
Upper Wilcox Clay
Carrizo Sand(Fresh Water)
Austin Chalk
Eagle Ford Shale, Buda
Limestone, & Del Rio Clay
Well Construction
Injection Tubing
Retrievable Packer
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 19
Class I Test Injection Well
• Total Project Cost: $4.83M• Cost Per Linear Foot: $958
Project Costs
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 20
Class I Test Injection WellInjection Well Results• Depth: 5,000 – 5,300 ft
• Injection Zone Edwards Limestone Upper Glen Rose Limestone
• Native Edwards water salinity ~ 90,000 mg/L TDS
• 450 gpm Injection Rate
• Two Injection Wells required for BGD Phase I (about 1.1 MGD)
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 22
20132012
Conceptual Design
Pre-Construction
Design
2015 20162014
Program Completion October
2016
Construction Management Services
Construction
Commi-ssion
Commi-ssion Warranty
Warranty
2017 2018Program Manager
(PM)
Construction Manager at Risk
(CMAR)
GMP Board AwardMarch 2014
CMAR Process• Process allows:
– Contractor’s input in the design– Engineer’s involvement in construction planning– Qualification based selection– Guaranteed maximum price (GMP)– Pursue SAWS SMWB goals
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 23
Program Components• 12 - Production Wells
• 2 – Injection Wells
• Reverse Osmosis Treatment Plant
• Pipelines
• SCADA and Electrical system
• Security
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 24
Activities Completed• Design Completed
– Wells– Conveyance– RO Treatment Plant– Electrical / SCADA– Security
• Construction and Guaranteed Maximum Price approved by SAWS Board in March
• Construction Manager at Risk in the procurement phase
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 25
Current ActivityTreatment Plant Earthwork – Jun. 21, 2014
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 26
Current ActivityTreatment Plant Earthwork – Sept. 9, 2014
October 2, 2014
Brackish Groundwater Desalination Program UpdatePage 28
Cost
• Total estimated construction cost:
$192.66 million
• $/AF: $1,177 / AF
• Construction in Progress
• Completion - October 2016
Phase I