EASTERN MUNICIPAL WATER DISTRICT CalDesal Conference Desalination Today for Water · PDF...
Transcript of EASTERN MUNICIPAL WATER DISTRICT CalDesal Conference Desalination Today for Water · PDF...
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CalDesal Conference Desalination Today for Water Tomorrow
Paul D. Jones II, P.E. General Manager, EMWD October 1, 2015
www.emwd.org 1
EASTERN MUNICIPAL WATER DISTRICT
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Overview of EMWD
www.emwd.org 2
• Established in 1950 • 542 Square-mile Service Area • Population of 768,000 • Serving Seven Cities and
Unincorporated Areas • One of 26 MWD Member Agencies • High-growth Area
• 11.0” to 12.6” of rain per year (4” last year).
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Products and Services
www.emwd.org 3
• Potable Water: 138,000 accounts o 90,000 AF of Potable Water Sales/year
Imported Water Hemet and Perris Water Filtration Plant Menifee and Perris I Desalters Perris II Desalter (Design) Groundwater Wells
• Wastewater: 229,000 Accounts o Four Wastewater Treatment Plants
Capacity 63 MGD Currently Treating 46 MGD
• Recycled Water: o Fourth Largest in California
Fully developed pressurized distribution system with 5,721 af of seasonal storage
Currently 100 percent of Recycled Water is delivered for Beneficial Reuse
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EMWD’s 2014 Water Supply Portfolio
www.emwd.org 4
Local Water Supply:
56,800 AF 44%
Imported Water Supply from MWD:
71,200 AF 56%
Recycled Water 28%
Desalination 4%
Wells 13%
Untreated SWP and CRA
Water 17%
Colorado River Water (CRA) 33%
Bay Delta Water (SWP)
4%
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Desalination Program
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• Brackish Desalination Objectives: o Develop Substantial Unused Brackish Groundwater
(>1,000 mg/l) o Protect Adjacent Groundwater Sub-basins from Salinity
Intrusion o Achieve Net Salt Balance Relative to Imported Water
Supplies o Utilize Available Brine Disposal Options and Advance
Recovery Technologies o Implement Timely and Cost Effective Expansion Projects
Strategic Supply Goal: Expand Brackish Groundwater Desalination to
Provide over 17,500 AF/year to Serve 35,000 Households
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• Feedwater pipelines • 3 Production wells
Inland Empire Brine Line
Existing Program - Menifee Desalter
Menifee Desalter - Phase I • 3.1 MGD Reverse Osmosis Desalter • 4,000 AF/year Production • Operational in 2002
Perris South Basin
www.emwd.org 6
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• Feedwater pipelines • 9 Production wells
Perris I Desalter • 5.6 MGD Reverse Osmosis Desalter • 7,200 AF/year Production • Operational in 2005
Existing Program - Perris I Desalter
Inland Empire Brine Line
Perris South Basin
www.emwd.org 7
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Proposed Perris II Desalter – Phase I
• Treatment Facility – 3.5 MGD with RO (expansion up to 5.4 MGD)
• Production Facilities – four wells with combined capacity of 3,000 gpm
• Desalter feed pipeline expansion • Brine disposal connection to Inland
Empire Brine Line station • Phase I Costs:
• Capital - $59.8 million (less $12.1 million in state/fed grants)
• Operating - $2.59 million/year
www.emwd.org 8
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Brackish Desalination Supply Costs
www.emwd.org 9
$923 - $1,055
$250
$1,015 - $1,235
$401
$2,014 - $2,257
$1,200 - $1,400
$0
$500
$1,000
$1,500
$2,000
$2,500
Imported water fromMWD
Groundwater Wells DesalinatedGroundwater
Recycled Water Ocean Desalination Indirect Potable Reuse
$ pe
r ac
re f
oot
of w
ater
Current EMWD Supplies Alternative Supplies
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Salinity Management Program Overview
www.emwd.org 10
• Salinity Management o 2.3 MGD of Brine Disposal through
the Inland Empire Brine Line o 4.5 MGD Disposal at Full Expansion o Current Salt Removal
25,000 Tons Annually Slight Net Import into Region with
Imported Water o Ultimate Salt Removal Goal
55,000 Tons Annually Net Export
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Net Salt Balance – Salinity Management
Imported Water (Average Year) SWP = 46,900 af/yr (66%) 250 mg/l or 680 lbs/af = 15,900 t/y CRA = 24,000 af/yr (33%) 520 mg/l or 1,360 lbs/af = 16,400 t/y 32,300 t/y Current Desalting and Brine Discharges EMWD Menifee and Perris I Desalters - 2.3 MGD brine 25,000 t/y Other industrial dischargers
Intl Rectifier - 0.05 MGD (30,000 mg/l) 2,300 t/y Inland Empire Energy - 0.2 MGD (6,000 mg/l) 1,800 t/y
29,100 t/y
Imported Supply Salt (TDS – mg/l) Lbs. of salt/acre foot Colorado River Water ~500 to 700 mg/l 1,360 to 1,900 lbs/af
State Water project (current) ~250 mg/l 680 lbs/af
www.emwd.org 11
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Brine Disposal Options
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• Cost for O&M $1.05M/year • Cost for Pipeline Capacity ~ $3.75M/MG • Cost for Treatment and Disposal
Capacity ~ $8.6M/MG
• Constructed by a Five Agency Joint Powers Authority
• Pipeline is 70 miles long
• Capacity is 32.6 MGD
• Supports Six Desalters and Industrial Dischargers Including EMWD’s Perris and Menifee Desalters
• EMWD has 5.9 MGD Pipeline Capacity and is currently using about 2.3 MGD
EMWD Desalters
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Why Consider Brine Recovery?
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• Increasing Costs of Brine Disposal: currently $1.05 million/year.
• Single Brine Disposal Option and Limited Facility Capacity.
• Loss of Valuable Water Resource: o Presently - 2,500 AF/year o Future - 4,000 AF/year
• Reliability and Brine Disposal System Redundancy.
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GE AquaSel™ Brine Treatment Technology Pilot
www.emwd.org 14
• EDR and Proprietary Precipitator - Proven brine concentration technology used in bottling industry
• Potentially capable of improving brackish desalting overall recovery efficiency from 72 percent to a range of 94 to 98 percent.
• Public/Private partnership with General Electric. • Public Agency Participation:
o Secured Metropolitan Water District’s Foundational Action funding grant ($192,000)
o Bureau of Reclamation – technical peer review and pilot program support ($132,000)
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Summary of Testing
• Placed in operation November 30, 2014 - first day of operations processing RO concentrate
• Membrane fouling and hydraulic issues o Silica and calcium carbonate fouling (scaling)
• Promising operational performance: o 1,730 hours of operation o 320 hours of continuous run time
• Consistent operation since April 13, 2015 with occasional downtime
• Decommissioned August 3, 2015 • Overall stable brine recovery of 95 percent achieved
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Conceptual Costs for 2.3 MGD AquaSel™ Plant
www.emwd.org 16
Description Projected Cost
Chemicals $ 795,000
Sludge Disposal $ 320,000
Electricity $2,028,000
SAWPA Disposal $ 97,000
Other O&M (Membrane Replacement, etc.) $ 324,000
Total Annual O&M $3,563,00
Annual Capital Costs * $ 752,000
Total Annual Capital and Operating Costs $4,315,000
Overall Recovery 95 percent
Recovered Water 2,135 AF/year
Cost per AF for Recovered Water $ 2,021
Avoided Annual Disposal Costs $ 959,000
Net Cost per AF of Recovered Water $ 1,572 +/- * Assumes $13 million capital amortized at 4%; all project operating costs preliminary projections and subject to verification.
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Brackish Desalination Supply Costs
www.emwd.org 17
$923 - $1,055
$250
$1,015 - $1,235
$401
$2,014 - $2,257
$1,275 - $1,500
$0
$500
$1,000
$1,500
$2,000
$2,500
Imported water fromMWD
Groundwater Wells DesalinatedGroundwater
Recycled Water Ocean Desalination Indirect Potable Reuse
GE AquaSel™ Brine Treatment (Est.)
$ pe
r ac
re f
oot
of w
ater
Current EMWD Supplies Alternative Supplies
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Summary – Desalination Program
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• Creates Local Potable Water Source to Meet Growth o Will Provide over 17,500 AF/year to Serve 35,000 Households
• Reduces Dependence on Imported Water • Is Cost Effective and Competitive with Alternative Supplies • Meets Regional Salinity Management and Offset Objectives
o Protects Groundwater Basins from brackish water intrusion • Sustains Recycled Water Program through Source Water Salinity
Reduction
Summary of EMWD Brackish Water Desalination Program
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Summary – Brine Recovery
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• Success achieving overall brackish water recovery of 95 percent. • Initial fouling of EDR caused by high silica levels.
o Silica issue was substantially mitigated using multi-media cartridge filter, and Ferric Chloride (FeCl3).
• Next Steps: o Review data collected on system performance (removal efficiency, cleaning
cycles, silica and calcium carbonate fouling, etc.). o Complete draft project report – October 2015
USBR and MWD peer review of data o Validate operating cost data (electrical, chemical, etc.), determine scalability
and finalize project report – January 2016
Summary of Brine Minimization and Recovery Pilot – GE AquaSel™
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Contact Information EASTERN MUNICIPAL WATER DISTRICT
Paul D. Jones, II, P.E. General Manager PO Box 8300 2270 Trumble Road Perris, California 82572-8300 (951) 928-3777, extension 6130
www.emwd.org 20