water reuse 101 -introduction to water...
TRANSCRIPT
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WATER REUSE 101 - INTRODUCTION
TO WATER REUSE
Shannon K. Rodriguez, P.E., WRT Secretary/Treasurer
City of Houston Drinking Water Operations
July 14th, 2016
San Marcos, Texas
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Overview
• What is Water Reuse?
• Factors Driving Water Reuse
• Types of Water Reuse
– Case Studies
• Benefits of Water Reuse
• What Water Reuse is Not
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What is Water Reuse?
To use again; recycle; to intercept, either
directly or by exchange, water that would
otherwise return to the natural hydrologic
(water) system, for subsequent beneficial
use
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What is Water Reuse?
• The beneficial use of wastewater that
has been purified so its quality is suitable
for the intended use
• Offers a climate independent water
source
No NEW water
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What is Water Reuse?
Reuse Water
=
Reclaimed Water
=
Recycled Water
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Factors Driving Water Reuse
– Drought
– Population growth
– Increased municipal, industrial, and
agricultural demand
– Dependence on single source of supply
– Restrictions on wastewater discharges
(nutrient limitations)
7
Water
scarcity
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Factors Driving Water Reuse
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Types of Reuse
• Nonpotable Reuse (NPR)
• Indirect Potable Reuse (IPR)
• Direct Potable Reuse (DPR)
• “De Facto” Reuse
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NONPOTABLE REUSE
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Nonpotable Reuse (NPR)
• Includes all recycled or reclaimed water
reuse applications except those related
to drinking water
• Dual Distribution Systems (Purple Pipe)
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Nonpotable Reuse (NPR)
Wastewater
Treatment
Drinking Water
Customers
Raw Water
Sources
Nonpotable Users
Agriculture/ Irrigation
Business
And
Industry
Community
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WATER REUSE FOR AGRICULTURE
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• Most common and publicly accepted form of reuse
• Urban and suburban applications
– Common space, parks, and public property
– Business and residential lawn irrigation
– Strong foundation of health risk-related research to
support the safety of this practice
• Agricultural (namely food crop) applications
– Common in California
– Occurs in Florida
– Topic of rule making in Colorado, Hawaii and others
– Additional monitoring, mainly for pathogens, is generally
required
Irrigation Quality Reuse
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Monterey, CA Regional Water Pollution
Control District- Agricultural Reuse
• World's largest water recycling facility designed for raw
food crop irrigation – 30 mgd with tertiary treatment
• Originally designed as a salt water intrusion barrier source
• Supplies reuse for 12,000 acres of prime farm land
• Includes world’s largest
artichoke supplier
• Many other vegetables
and fruits
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Eastern Municipal Water District, CA
– Agricultural Reuse
• Four facilities, 45 mgd capacity
• Tertiary treated recycled water
• Additional treatment via created
wetland habitat
• Agricultural irrigation
– Fruits and vegetables
– Fodder for cattle
• Non crop irrigation
• Industrial reuse
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El Paso Water Utilities, TX Reclamation
Systems- Urban/Suburban
• Almost 6 mgd of reclaimed water
• System supplies
– golf courses
– city parks
– school grounds
– apartment landscapes
– construction
– industrial sites
• Two additional projects are under construction
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WATER REUSE FOR BUSINESS AND
INDUSTRY
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• 8 mgd of purified water
• Uses microfiltration,
reverse osmosis &
ultraviolet disinfection
• Current uses
– Manufacturing
– Irrigation
• Future uses
– Planning for potable reuse
Santa Clara Valley Water District, CA
- Industrial
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Four Producers in Santa Clara Area –
Recycled Water Produced v. Reused
Recycled Water – Untapped Remaining Resource
Produced Reused
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West Basin Municipal Water District,
CA - Industrial
• 35 mgd of tertiary water
– additional treatment at
decentralized facilities
• Use for:
– Irrigation
– groundwater recharge
– industrial applications
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West Basin MWD
Different
treatment
levels for
different uses
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WATER REUSE FOR THE
COMMUNITY
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• Denver Water produces 30 mgd of
tertiary recycled water for:– Xcel Energy – 10 mgd cooling water
– Parks
– Golf courses
– Zoo
– Commercial and industrial users
– Denver Zoo - 2 mgd
• Phase 2 would expand the recycling
system to 45 mgd
Denver Water – Denver Zoo
Partnership
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East Bay Public Plaza Reclaimed
Water Wading Stream
• Interactive water feature mimics a natural stream from waterfall to Bay including “groundwater seeps”
• Class A Reclaimed Water (100 mgd)
• Attracts hundreds of families and visitors each summer
Oregon’s Lott Clean Water Alliance
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San Antonio, TX Water Recycling
• 130 miles of pipeline
delivers 29 mgd of
recycled water to:
– Golf courses
– Parks
– Commercial
– Industrial
– Also remaining recycle flows provide baseflowsfor Upper San Antonio River (famed River Walk) and Salado Creek
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INDIRECT POTABLE REUSE
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Indirect Potable Reuse (IPR)
• The blending of advanced treated
recycled or reclaimed water into a
natural water source (groundwater basin
or reservoir) that could be used for
drinking (potable) water after further
treatment
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Wastewater
Treatment
(often with some
advanced treatment)
Water Treatment
Drinking Water
Indirect Potable Reuse (IPR)
Customers
Other Water
Sources
“Environmental
Buffer”
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IPR CASE STUDY
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• Groundwater = 70% local
supply for 2.4 million residents
• 14”/yr rainfall (semi-arid)
• Seawater intrusion threatens
groundwater quality
• Potable reuse is a critical
component of basin
replenishment– Excellent water quality (high-level
purification/treatment)
– Reliable
– Cost-effective
Orange County Water District, CA –
Groundwater Replenishment
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Groundwater Replenishment System
Partnership
OCSD
OCWD
Primary
Treatment
Secondary
Treatment
Source
Control
Microfiltration
(MF) Reverse Osmosis
(RO)
Ultraviolet Light
(UV)
with Hydrogen
Peroxide
Groundwater
Recharge
Basins
Seawater
Barrier
Injection
Wells
100 mgd
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DIRECT POTABLE REUSE
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Direct Potable Reuse (DPR)
The introduction of advanced treated
reclaimed water either directly into the
potable water system or into the raw water
supply entering a drinking water treatment
plant
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Wastewater
Treatment
Water Treatment
Drinking Water
Direct Potable Reuse (DPR)
Customers
Other Water
Sources
Advanced
Treatment
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DPR CASE STUDIES
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Colorado River Municipal Water District, Big
Spring, TX Water Supply Augmentation
Big Spring
Wastewater
Treatment Plant
CRMWD Raw Water
Production Facility
E.V. Spence
Reservoir
Lake J.B.
Thomas
Beals Creek
Red Draw
Reservoir
RO Concentrate
Big Spring
0.25 mile
Big Spring Water
Treatment Plant
16 mgd
37 mgd combined
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CRMWD at Big Spring Treatment
Process
Raw Water Production
Facility
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• Population ~ 104,000
• Existing Water Supplies– Lake Kickapoo
– Lake Arrowhead
– Lake Kemp (high TDS)
• Water Treatment Plants– Jasper- 24 mgd
– Cypress- 52 mgd
• 42 mgd conventional
• 10 mgd MF/RO
– for Lake Kemp water
City of Wichita Falls, TX
Drought
Precipitation
~22 in/yr
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DE FACTO REUSE
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“De Facto” Reuse
When a community draws water from a
river or reservoir that includes treated
wastewater discharged by upstream
communities
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Conventional
Wastewater
Treatment
Water Treatment
Drinking Water
“De Facto” Reuse
Customers
Discharge
Upstream
Diversion
Downstream
Conventional
Wastewater
Treatment
Repeat
Downstream
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DE FACTO REUSE CASE STUDY
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De Facto Indirect Potable Reuse in
the Trinity River Basin
Treated
Wastewater
Treated
Drinking
Water
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BENEFITS OF WATER REUSE
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Benefits of Water Reuse
• Dependable Source of Supply
• Locally Controlled
• Environmentally Friendly
• Augments Existing Supplies
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WHAT WATER REUSE IS NOT!
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What Water Reuse is NOT
Water Reuse
≠
Greywater
Water Reuse
≠
Wastewater
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The End
Questions?
Shannon K. (Smith) Rodriguez, P.E.*
WateReuse Texas Secretary/Treasurer
City of Houston, Drinking Water Operations (Water Quality)
Supervising Engineer
*Texas and New Mexico