Hawaii Solar Desalination Project September 21, 2018 Cost Effective Sea Water Desalination using Solar Thermal Energy Driven Forward Osmosis Process Team Members: Natural Energy Laboratory of Hawaii Authority Trevi Systems, Inc. Cyanotech Corporation Hawaii First Water, LLC US DOE
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Hawaii Solar Desalination Project
September 21, 2018
Cost Effective Sea Water Desalination using Solar
Thermal Energy Driven Forward Osmosis Process
Team Members:
Natural Energy Laboratory
of Hawaii Authority
Trevi Systems, Inc.
Cyanotech Corporation
Hawaii First Water, LLC
US DOE
Forward Osmosis Desalination ProcessPUMP
SALINE
WATER
SEMI-PERMEABLE
MEMBRANE
BRINE
PRODUCT
WATER
CONCENTRATED DRAW
SOLUTION
DILUTE DRAW SOLUTION
Low temp HEAT/
electricity
FO Overview
Water Options for Hawaii Island
Desalination:
At Hawaii electrical utility rates - 30c/kWh (and tracks with the cost of oil)
Energy cost
• RO $1.11/m3 @ (3.7kWhe )
• MED $1.10/m3 @ (65kWht* and 1.5kWhe)
• FO $0.60/m3 @ (30kWht* and 1.0kWhe)
• Both MED and FO need a source of low temperature heat in addition to
the electrical energy.
Trevi’s Solar FO System in Hawaii
4
Trevi Systems | Confidential. Do not distribute.
500m3/day FO System
Micro-CSP Array (Installed)
Hot Water Storage TankEnergy StorageTank
FO Desalination Components at NELHA
PCM Salt Storage
(CSP existing)
Product
Water
Pre
-Tre
atm
ent
–
RO
“L
ite”
Sea Water
Brine
FO
Mem
bra
ne Draw Sol.
Tank NF
Filt
er
Dra
w H
X
Pro
du
ct H
X
Solar
Heat
Exchanger
Pump #1
Pump #2
Back. Press Regulator
Conc. draw
Conc. draw
Prod. waterC
oale
scer
Dilute draw
Complete
Phase
change
Water Phase
PolymericDraw solution
Plastic Heat Exchanger Fabrication
3D CAD of proposed tube-in-tube design
Trevi developed Spiral Wound plastic HX
Trevi’s Plastic Plate and Frame heat exchangers
• The unique phase change characteristics of its draw solution require a non-traditional heat exchanger design.
CEO J Webley, CSO G Carmignani and Field Te.ch at Masdar
Biological Fouling at Masdar Trial Coalescer and loop pump[
Masdar 2 container 50m3/day Pilot (Outside Dubai) FO membranes, Pre-treatment and Heat recovery HX
US Navy 10m3/day SystemKuwait 10m3/day System
Saudi 10m3/day Systems
1m3/day Test System
Forward Osmosis Desalination Process
Hybrid Power and Water Plants
PCM Salt
LFR Array
PV Array
Low Temp. Heat to FO
Plant
Hi Temp heat for
dispatchable power gen.
Battery or flow
storage Peak PowerDemand
GridBaseload
Water
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