Brackish Desalination- Water Supply Planning for Resiliency and Growth

National Water Resources Association

Paul D. Jones II, P.E. General Manager, EMWD

November 12, 2014

www.emwd.org 1

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).

Southern California - Sources of Water

Bay Delta Colorado River Aqueduct

State Water Project

Sierra Nevada Mountains

Local Supplies:•  Groundwater •  Brackish Desalination•  Recycled Water

�Best Practices� in Water Use

Efficiency (Conservation)

www.emwd.org 9

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%

•  EMWD�s Urban Water Management Plan based upon 2045 build-out of city county general plans

Salinity Intrusion

•  EMWD Adopted Strategic Plan:o Maintain long-term balance of imported and local supplies.o Protect and enhance groundwater resources through salinity management.o Recycle 100% of wastewater for beneficial use.

•  To support growth, EMWD has committed to local resource investments:

o Expand and Transition Recycled Water Use (Indirect Potable)o Increase Water Use Efficiency standardso Maximize Brackish Desalination (new capacity and brine recovery)

www.emwd.org 5

Growth in Demands – Limited Supplies

2045 Demands: 215,000 AF – an increase of 68%

EMWD is one of the largest marketers of recycled water in California

Program started in 1960�s:• Four tertiary treatment plants – 45 MGD• Agricultural Irrigation (10,800 acres).• Sport fields, golf courses, parks, schools, medians, recreational.• Industrial (regional power plant, manufacturing).• $188 million in capital investments

37,800 af in 2013

www.emwd.org 6

Currently 100% of Wastewater is Recycled for Beneficial Use

Succession Plan: Indirect Potable Reuse project

140$

150$

160$

170$

180$

190$

200$

210$

220$

230$

1999$ 2000$ 2001$ 2002$ 2003$ 2004$ 2005$ 2006$ 2007$ 2008$ 2009$ 2010$ 2011$ 2012$ 2013$

Gallo

ns'per'Cap

ita'per'Dat'(G

PCD)'

Actual$GPCD$ Baseline$GPCD$ Target$GPCD$

Baseline'Average''=''196'GPCD'

2020'Compliance'Target'=''175'GPCD'

144'GPCD'

27%$Reduc*on$

Statewide Average: 198 GPCD

Water Use Efficiency

www.emwd.org 7

!  Budget-based rates and outreach!  Rebates and incentives for devices!  Landscape standards and conversion

Desalination Program

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•  Brackish Desalination Objectives: o  Develop substantial unused brackish

(>1,000 mg/l) groundwater in service area that receives sub-surface recharge.

o  Protect adjacent groundwater resources 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 Desalination to provide over 17,500 af/year to serve 35,000 households

Salinity Management

www.emwd.org 9

Groundwater Management Zones

•  Canyon 230 mg/l•  S.J. Up. Press. 320 mg/l•  S.J. Low. Press. 520 mg/l•  Lakeview 520 mg/l•  Hemet North 520 mg/l•  Perris North 570 mg/l•  Hemet South 730 mg/l•  Menifee 1020 mg/l•  Perris South 1260 mg/l

EMWD$Service$Area$and$$Groundwater$Basins$

EMWD�s Desalination Program Components

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•  Groundwater Wells•  Desalter Feed Pipelines•  Treatment Facilities

o  Menifee and Perris I Desalters

o  Perris II Desalter (future)

•  Brine Disposal o  Inland Empire Brine Lineo  On-site recovery (future)

•  Feedwater pipelines •  3 Production wells

Inland Empire Brine Line

Existing Program - Menifee Desalter

Menifee Desalter - Phase I •  3.1 MGD Reverse Osmosis Desalter •  3,500 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 •  6,200 AF/year Production •  Operational in 2005

Existing Program - Perris I Desalter

Inland Empire Brine Line

Perris South Basin

www.emwd.org 12

Proposed Perris II Desalter – Phase I

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•  Treatment Facility – 3.5 MGD with Reverse Osmosis

•  Production Facilities – four wells with combined capacity of 3,000 gpm

•  Brine disposal pipeline extension – 12,500 LF•  Desalter feed pipelines – 8,200 LF•  Finished water pipeline and utilities

Net Salt Balance – Salinity Management

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Imported WaterSWP = 46,900 af/yr (66%) 250 mg/l or 680 lbs/af = 15,900 t/yCRA = 24,174 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/yOther industrial dischargers

Intl Rectifier - 0.05 MGD (30,000 mg/l) 2,300 t/yInland 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

Brackish Desalination Supply Costs

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$ p

er a

cre f

oot o

f w

ater

EMWD Supplies Alternative Supplies

Typical Embedded Energy Values for Water Supply Options

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0

1,000

2,000

3,000

4,000

5,000

SWP CRA Well Brackish Recycled Seawater

kWh

/ AF

Conveyance from TreatmentTreatmentConveyance to Treatment

3,200

2,000

1,200

2,600

900

4,600

Salinity Management Program Overview

www.emwd.org 21

•  Brackish Desalting – Water Supplyo  Currently producing 8,500 af/year (Menifee

and Perris I).o  Additional planned production up to 17,800

af/year (with Perris II).o  Cost effective ($1,015 to $1,235/af) and

highly reliable.

•  Salinity Managemento  2.3 mgd of brine disposal through brine line.o  4.5 mgd disposal at full expansion.o Current salt removal: 25,000 tons annually

(slight net import).o Ultimate salt removal goal: 50,000 tons

annually (net export).

Brine Disposal Options

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•  Constructed by a five agency Joint Powers Authority

•  Pipeline is 70 miles - capacity is 32.6 MGD.

•  Supports six desalters and industrial dischargers, including EMWD�s:

– Perris Desalter– Menifee Desalter

•  EMWD has 5.9 MGD pipeline capacity and is currently using about 2.3 MGD

– Cost for O&M $1.05 M/yr•  Cost for purchased capacity:

– Pipeline capacity $3,750/MG

– Treatment and disposal capacity $8.6 million/MG

EMWD$Desalters$

Technology - Brine Minimization and Recovery

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GE AquaSel Brine Treatment Technology• Improves brackish desalting overall water recovery efficiency from 75 percent to about 98 percent• Proven brine concentration technology used in bottling industry – lower energy/chemicals• Public/Private partnership with General Electric to test AquaSel pilot unit.• AquaSel unit scheduled delivery date: November 2014• 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)

Brine Minimization and Recovery Efforts

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GE AquaSel • Pilot testing 0.25 MGD unit for 9 months

o  Reliability, chemical consumption, energy costs and recovery efficiency.

• Potential full scale application if pilot test is successful.

• Economic performance forecast (subject to validation)o  2.3 MGD (capital = $13 million – est., O&M = $3.5 M)

o  Recovered water = 2,400 af @ $1,810/af

o  Avoided brine disposal costs = ($407/af)

o  Net Cost for Recovered Water = $1,403/AF

Summary and Conclusions

21

Advantages of EMWD Brackish Water Desalination Program•  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 objectives.

o Protects groundwater basins from brackish water intrusion.•  Has lower GHG footprint than many other supplies.•  Sustains recycled water program through source water salinity

reduction.•  Provides opportunities for expansion through technology

o Brine minimization and recovery

Contact Information EASTERN MUNICIPAL WATER DISTRICT

Paul D. Jones, II P.E.

General Manager

(951) 928-3777 ext. 6130

jonesp@emwd.org

www.emwd.org 22