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www.desalitech.com
High Efficiency Water Treatment
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Mission
The world is running out of water
Traditional RO is expensive and wasteful
Desalination and reuse: only sustainable water resources
3/4 of brackish RO cost is excess feed and brine.
2/3 of the cost of seawater RO is energy.
Desalitech’s mission is to be the leading global provider of: High efficiency flexible water purification and wastewater reuse systems, New sustainable sources of reliable and affordable water for industry,
agriculture and municipalities
Present value costs for typical 367 gpm (2,000 m3/d) industrial RO Unit for 10 years
$/1,000 gal 75% Recovery 95% Recovery
CAPEX $0.28 6% $0.28Energy $0.26 6% $0.26O&M $0.62 13% $0.62Brine + xs Feed $3.48 75% $1.10Total $4.64 100% $2.26
The Biggest Cost of Brackish/Industrial Desalination & Reuse is Brine Disposal or Treatment
Raising recovery lowers
TCO >50%
Increase BWRO recovery
Technology
Introduction to Reverse Osmosis
• Reverse Osmosis (RO) is the global standard water purification method. • 60 years of slow evolution led to a technological plateau.
Cross flow
Traditional Reverse Osmosis
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Technology
• Multiple stages are required for > 50% recovery, however• Multiple stages mean cost, complexity, inflexibility• “Unbalanced” operation causes fouling, scaling and lower recovery.
Pump or permeate throttle between stages
Fouling of lead elements
Scaling of tail elements
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Dirt flushed or filters changed periodically.
Technology
Simple Filtration
• Unlimited recovery • No cross flow = not suitable for RO
Permeate flow equals feed flow
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Differentiated Technology
ReFlex™ RO The first major improvement in the RO process in decades.
Up to 98% recovery in a single stage, depending on water chemistry Recovery set at control panel Cross flow driven by circulation pump Fouling/scaling limited by x-flow and salinity cycling
300 gpm ReFlex RO, Startup 2014
Figure-4: Maximum Pressure vs Silica in Concentrate
644
716759
834884 909 930
492556
610
675735
050
100150200250300350400450500550600650700750800850900950
1,000
170 180 190 200 210 220 230 240 250
psi - Maximum Pressure
ppm
-Si
lica
in C
once
ntra
te
10.1 gfd (17.2 lmh)11.5 gfd (19.6 lmh)
Record high silica concentrations in membrane reject. Normal limit is 250 ppm.
Frequent flushing prevents scaling.
Scaling Resistance
Case Studies
Coca Cola, brackish well water to ingredient water
Startup mid 2014 93% recovery and 95% recovery guaranteed and met “The Desalitech systems performance demonstrated
that it can run at very high recovery rates under very high TDS water, with little or no fouling over time.”
Mid America Steel UnileverPartner Water Street Veolia. Approved by CH2MHill & JacobsApplication Wastewater Reuse
Near Zero Liquid DischargeProcess / Boiler Water MakeupMission Critical Application for the plant
Industry Steel processing Food & BeverageCustomer Challenge
Steel mill was hauling 60,000 gallons of rod mill and melt shop wastewater per day at a cost of about $12,000/day or $3M/year
$152M margarine plant expansion required reliable makeup water. Competing RO would have wasted $850K/year in water costs
Solution ReFlex 50 + pre treatment, recycling wastewater at 90‐93% recovery
2 X ReFlex 300, purifying tap water at 90‐95% recovery & <20 ppm TDS permeate
Impact Waste generation reduced by 90%, saving more than $10,000/d while serving as a new water source
Saving up to $470‐650K/year. Reduced environmental footprint & achievement of corporate sustainability goals
ROI ROI < 2 year ROI < 2 year
Site pictures
Case Studies
Installation Examples
Present Value Costs for typical 10 MGD (38,000 m3/d) Seawater RO Plant for 25 Years
The Biggest Cost of Seawater Desalination is Energy
$/1,000 gal State of the Art 1% Higher CAPEX5% Lower Energy
CAPEX $0.66 14% $0.67Energy $2.38 52% $2.30O&M $1.52 33% $1.52Total $4.55 100% $4.47
Reduce SWRO energy consumption
Worth it!
brine displaced from RO system with pre-pressurized feed from side conduit
CCD with Side Conduit
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HP
CP
Feed
Brine
PermeateHP
CP
HP
CP
Feed
HP
CP
BrineFeed
CCD with Side Conduit
Continuous batch process. HP pump flow and permeate flow constant. Circulation pump flow constant. Lower average feed pressure. No high-pressure reject stream.
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Applied and Osmotic Pressures
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• Measured specific energy: 1.91 kWh/m3, 518 ppm permeate at 15 degC (59 degF), 47% recovery and 9.2 lmh (6 gfd) flux, 35,000 mg/l feed.
• Normalize to 25 degree C (77 F) with use of a standard temperature correction factor:
1.45 kWh/m3, 682 ppm permeate• Large-scale state of the art SWRO plants consume
2.2 to 3.0 kWh/m3 under similar conditions.
Record Low Energy Consumption
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Next Generation Membranes
High permeability = low energy membranes are available today. Use in 6 or 7 element arrays is limited by high lead element flux. “Internal staging” with high rejection lead elements and high
permeability tail elements used to distribute flux. Short arrays get full benefit of high permeability membranes.
High Permeability Low Permeability
75%Reduction in water waste
35%Reduction in energy
Increased reliability and uptime
New level of flexibility
Value Proposition
Standard RO components
