CalDesal Conference Desalination Today for Water Tomorrow

Paul D. Jones II, P.E. General Manager, EMWD October 1, 2015

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EASTERN MUNICIPAL WATER DISTRICT

Overview of EMWD

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• 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).

Products and Services

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• 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

EMWD’s 2014 Water Supply Portfolio

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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%

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

• 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

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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

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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

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Brackish Desalination Supply Costs

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$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

Salinity Management Program Overview

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• 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

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

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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

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.

GE AquaSel™ Brine Treatment Technology Pilot

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• 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)

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

Conceptual Costs for 2.3 MGD AquaSel™ Plant

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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.

Brackish Desalination Supply Costs

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$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

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

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™

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

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