voltea's desalination technology applied on cooling water b&j.pdf
TRANSCRIPT
Desalination Cooling Water
with CapDI
January 11
September 22nd, 2010
Confidential
Erik Driessen
Imagine 1 m³ water…
� Volume of 1 m³ water
� Brackish: 1.000 mg/l NaCl
� 1.000 kg water � 55.555 mol H₂O
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� 1 kg salt � 17,2 mol NaCl
1 particle per 1.614 particles is an ion…
1 particle
per 1.614 particles
Principles of separation
Technology
“CapDI: removing
salt, not water”
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…evaporating all water. …forcing all water through
a membrane.…attracting only the ions.
Energy consumption for:
10 – 15 kWh/m³ 1 – 1,5 kWh/m³ 0,2 – 0,4 kWh/m³
Voltea History
2004
• Unilever starts working on CapDI for domestic appliances
• Voltea formed to
Where we are today
• 20 Employees
• Leading edge R&D capability
• € 12 mil invested in CapDItechnology development
• Strong IP portfolio (40 patents) and expanding
Introduction Voltea
2006• Voltea formed to
commercialize CapDI
2008
• Acquisition of Biosource– consolidation of IP Portfolio
• Strong IP portfolio (40 patents) and expanding
• New investment Rabobank
• Winner of Water Technology Idol at Global Water Summit 2010 Paris
• NBNC: Voltea 3rd most creative company of Europe
Removing salt, not water
Capacitive Deionisation (CapDI)
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Electrodes, stacks, modules
Standard industrial system
-
1 flow path
(between 2 electrodes)
+
1 flow path
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1 stack
(with 23 flow paths)
1 module
(with 12 stacks)
Module tot SIS
Standard industrial system
-
1 flowpath
(between 2 elektrodes)
+
1 flowpath
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1 stack
(with 23 flowpaths)
1 module
(with 12 stacks)
1 Standard Industrial System A (SIS-12)
(with 12 modules)
SIS 2, SIS 12, SIS 24
Standard industrial system
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Cooling Water desalination
Business Case
Pilot @ Ben & Jerry’s
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Cooling Tower
Traditional With CapDI
EC
CapDI
LT
ECBlow
Down
Make-up
LT
Softening
t
EC
t
EC
• High fluctuating conductivity
• Risk of scaling
• Anti scaling/corrosion chemicals needed
• Softening of make-up water
• High water loss blow-down
• Desinfection needed
• Stable and low conductivity
• Low scaling potential (efficiency cooling process/operational costs)
• No/Less Chemicals (sustainable/operational costs)
• No softening make-up (operational/capital costs/sustainable)
• Closed blow-down (only drain CapDI)
• Desinfection needed
Make-up
water
Make-up
water
Ion exchanger
Setup Ola factory
E26 E25
Twee identieke condensorsKenmerken per toren
Capacity: 1.208 kW
Circulation flow: 90 m³/hr
Conductivity set-point: 1.550 µS/cm
Cycles of concentration: 3,1 x
Chemicals used: anti-scalant
anti-corrosie
Confidential January 11
E26 E25anti-corrosie
biocide
Element Unit Make-up water Condenser E25 Condenser E26
pH - 6,6 8,5 8,4
Conductivity µS/cm 490 1427 1277
Total Hardness °G (degrees German) 7,6 22,0 19,6
M-number - 70 210 190
P-number - 0 35 30
Chloride, Cl mg/l 53 n.a. n.a.
Water quality
Setup Ola factory
E26 E25
chemicals
evaporation
30,0 m³/day
evaporation
30,0 m³/day
Confidential January 11
E26 E25
CapDI
make-up44,1 m³/day
make-up33,5 m³/day
blow-down14,3 m³/day
brine
3,6 m³/day
desal. retour
-24%
-75%
CapDI pilot setup
Confidential January 11
Pre-filtration
Cooling tower
Simulation vs Real data
2
3
4
5
6
7
8
9
10
200
300
400
500
600
700
800
900
1000
pH
[-] / C
orra
tor [m
ills/y
r]
Co
nd
uct
ivit
y c
oo
lin
g b
uff
er
[µS
/cm
]
Conductivity feed Conductivity setpoint pH feed Corrater
Confidential January 11
CT with
Chemicals
CT with
CapDI
Make-up water EC: µS/cm 490 490
EC Set point: µS/cm 1500 350
Evaporation: m³/day 30,0 30,0
Make-up water consumption: m³/day 44,1 33,5
Discharged (waste): m³/day 14,3 3,6
Cycles of concentration: x 3,1 9,3
0
250
500
750
1000
1250
1500
1750
2000
0 24 48 72 96 120 144 168
Co
nd
uct
ivit
y[µ
S/
cm]
hours from t=0
Conductivity in Cooling system
0
1
0
100
9-17-10 12:00 AM 9-17-10 12:00 PM 9-18-10 12:00 AM 9-18-10 12:00 PM 9-19-10 12:00 AM 9-19-10 12:00 PM 9-20-10 12:00 AM
Co
nd
uct
ivit
y c
oo
lin
g b
uff
er
[µS
/cm
]
Simulation tool
Besparing E25 OLA
CT with
Chemicals
CT with
CapDI
Make-up water EC: µS/cm 490 490
EC Set point: µS/cm 1500 350
Evaporation: m³/day 30,0 30,0
Make-up water consumption: m³/day 44,1 33,5
Savings Per year
Make-up water 24 % 3.720 m³
Blow down (discharge) 75% 3.720 m³
Antiscalants 100 % 400 kg
Confidential January 11
Make-up water consumption: m³/day 44,1 33,5
Discharged (waste): m³/day 14,3 3,6
Cycles of concentration: x 3,1 9,3
Observations
� CapDI performance as expected;
� 25% saving make-up water and 75% blow-down/wastewater
� No additional chemicals needed;
� Optimization pre-filtration.
Confidential January 11
