Post on 04-Oct-2021
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
www.emwd.org 21
• 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
www.emwd.org 10
• 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
www.emwd.org 11
• 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
www.emwd.org 13
• 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
www.emwd.org 14
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
www.emwd.org 15
$ p
er a
cre f
oot o
f w
ater
EMWD Supplies Alternative Supplies
Typical Embedded Energy Values for Water Supply Options
www.emwd.org 26
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
www.emwd.org 18
• 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
www.emwd.org 23
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
www.emwd.org 23
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