Download - BalPure Electrolytic BWT
BalPure™Electrolytic
Ballast Water Treatment
System
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• Installed Base of SANILEC systems producing over 1 million pounds per day of chlorine equivalent worldwide
• Severn Trent DeNora accounts for 65% of the worldwide operating on-site hypochlorite capacity
• Over 400 systems operating in 59 countries• Offshore applications 21 different size systems
capable of producing from 3 to 2400 pounds per day of hypochlorite
• Installations since 1974
Experience
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Chemistry of electrolyzing sodium chloride
NaCl + H2O + 2e-
--->
NaOCl + H2
Salt+Water+Energy = Hypochlorite+Hydrogen
Electrolytic Ballast Water Treatment
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• Seawater slip stream enters one end of the electrolytic generator
• DC electric current is passed between electrodes through the Seawater to generate products
• Hydrogen removed while hypochlorite and seawater injected into main ballast line
• Br (Bromine) in Seawater reacts to form OBr -
(Hypobromite) and HOBr (hypobromous acid)• HOBr acts as an aggressive disinfectant when
injected back into the main ballast line
How Does It Work ?Electrolytic Ballast Water Treatment
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Electrolytic Ballast Water Treatment
Typical Severn Trent DeNora Double Cell Generating Skid
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• Efficacy of Halogens for disinfection is well established• Electrochemical oxidation is a well proven technology with 30 years
experience in the offshore industry, marine, and coastal power plants• STDN BalPureTM units are modular in construction and can be
backfitted into existing vessels without major modifications • Biocide has significant half life, solution mixes extremely well with
ballast water, efficacy is not dependent on seawater turbidity• Electrochemical oxidation systems are low cost vs. the alternate
proposed technologies• The cost of EC is appx. $0.02 per M3 of ballast water treated
($0.15/KWH generation cost)
Competitive Advantages
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• Hypochlorite Generation+ Controlled Addition
• Oxidant Monitoring+ Residual Maintained
• Oxidant Neutralization+ Controlled Addition+ Excess Sulfite Monitoring
• Data Logger
Key System Components
BalPureTM Water Treatment
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• Use sodium sulfite– Also use as food, wine preservative
• Na2SO3 +Br2 +H2O Na2SO4 +2HBr• 4 gpl Na2SO4 already exists in
seawater• HBr will not decrease pH in highly
buffered seawater
Oxidant Neutralization
Electrolytic Ballast Water Treatment
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• Located on Marrowstone Island at the northwest entrance to Puget Sound
• Typically used for marine fish diseases and aquatic toxicology research
• Previously conducted ballast water bench scale testing at this US Geological Survey Facility– Previously tested UV, Ozone, Chemicals
• Seawater can be pumped from the Sound at a rate of 1500 liters per min (90 M^3/hour)
Marrowstone Marine Field Station
Univ. of Washington Study
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Marrowstone Marine Field Station
Electrolytic Ballast Water Treatment
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• Total Residual Oxidant (TRO)• Live organisms as Zooplankton • Chlorophyll as a measure of
Phytoplankton• Bacteria• Toxicity of the water• Disinfection By-Products (DBP)
Parameters Measured
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• With or without Filtration: When initial hypo concentration is at least 3.0 ppm– Culturable Bacteria reduced > 99.99%– Phytoplankton reduced > 99%– Mesozooplankton reduced > 99%
• Filtration only impacts efficacy when hypo concentration is less than 1.5 ppm
• Bacteria grow back within 24 hours once residual oxidant is consumed
Test Results
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Test ResultsSodium Hypochlorite Generator / Filtration Experiment
September 2004 Total Residual Oxidant (mg Cl2 / L)
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
0 48 96 144 192 240
Time (h)
TRO
(mg
Cl 2
/ L) Control
Cl w/ filterCl w/o filter
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Test ResultsSodium Hypochlorite Generator / Filtration Experiment
September 2004Culturable Heterotrophic Bacteria
1.0E+00
1.0E+01
1.0E+02
1.0E+03
1.0E+04
1.0E+05
1.0E+06
1.0E+07
1.0E+08
1.0E+09
1.0E+10
0 48 96 144 192 240
Time (h)
Col
ony
Form
ing
Uni
ts /
L
ControlCl w/ filterCl w/o filter
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Test ResultsSodium Hypochlorite Generator / Filtration
October 2004 Experiment 1Culturable Heterotrophic Bateria
< 1.00E+04
< 1.00E+06
1.0E+00
1.0E+01
1.0E+02
1.0E+03
1.0E+04
1.0E+05
1.0E+06
1.0E+07
1.0E+08
1.0E+09
1.0E+10
0 48 96 144 192 240Time (h)
Col
ony
Form
ing
Uni
ts /
L
ControlF ClF No Cl
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• Ballast water has no toxicity once neutralized with sodium sulfite up to 22 ppm or ten times required+ Discharge Toxicology Studies Show No Effect On
• Herring Embryo• Mysid Shrimp• Bivalve Larval• Kelp• Diatoms
• Disinfection By Products in effluent meet U.S. drinking water standards+ THM 68 ppb (80 ppb)+ HAA5 9 ppb (60 ppb)+ Bromate < 1 ppb (10 ppb)
Test Results
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Commercial Testing
• 1,000 M3 per hour system being tested by United States Coast Guard at the Naval Research Labs in Key West Florida– Test protocol is based on IMO G-8 standards for Ballast
Water Treatment testing.
• STDN has received a grant from the National Oceanic and Atmospheric Administration (NOAA)– Conduct a shipboard demonstration test of the STDN Ballast
Water Treatment System
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Commercial Testing
• Partnership formed with a major US vessel owner to install a BalPure unit on one of their vessels– Vessel route is between US cities on the Gulf Coast– System sized for 2,000 M3 per hour ballast flow– Treatment System will be installed in six major components
• Electrolyzers• Control Panel and transformer / rectifier• Hydrogen separation• Booster pumps• In line analyzers • sulfite addition
• Installation to occur at end of second quarter 2007
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Commercial Certification
• Vessel owner and STDN will apply to the United States Coast Guard (USCG) Shipboard Technology Evaluation Program (STEP)– Pilot testing data completed– Environmental impact data developed
• BalPureTM Ballast Water Treatment System is patent pending
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BALLASTING
TREATM ENT SYSTEM LINESM AIN BALLAST LINES
LEG END
VALVE CLO SED
VALVE O PEN
STARBO ARDBALLAST TANK(S)
PO RT AND
W .L.
M IX TANKSULFITESO DIUM
INJECTPUM P
DECHLORINATIO N UNIT
ANALYZERSULFITE
BALPURE UNIT
CHLORINEANALYZER
PUM PBO O ST
PANELCONTROL
G ENERATO R
BALLASTPUM P
SEACHEST
Electrolytic Ballast Water Treatment
Metered Disinfection While Ballasting
Aft BallastTank
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Electrolytic Ballast Water Treatment
Sampling while Underway
CHESTSEA
UNDERWAY
VALVE OPEN
VALVE CLOSED
LEGEND
MAIN BALLAST LINESTREATMENT SYSTEM LINES
DECHLORINATION UNIT
SODIUMSULFITE
MIX TANK
SULFITEANALYZER
PUMPINJECT
PUMPBALLAST
PORT AND
BALLAST TANK(S)STARBOARD
ANALYZERCHLORINE
BALPURE UNIT
GENERATOR
BOOSTPUMP
CONTROLPANEL
W.L.
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Electrolytic Ballast Water Treatment
Metered Dechlorination while Deballasting
D E-B ALLASTIN G
C H ES TSE A
P U M PBA LLAS T
G EN E R ATO R
C O N TR O LPA N EL
BO O STP U M P
A N ALY ZERC H LO R IN E
BA LP U R E U N IT
SU LFITEAN ALYZER
D EC H LO R IN A TIO N U N IT
P U M PIN JEC T
S O D IU MSU LFITE
M IX TAN K
W .L.
VA LV E O P EN
VA LVE C LO S ED
LEG E N D
M AIN B A LLA S T LIN E STR EA TM E N T SY S TE M LIN E S
B ALLA STD IS C H A R G E
S TAR B O AR DP O R T A N D
B A LLA S T TA N K (S)
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NRL Unit 1000 M3/Hr @ 5 ppm
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• Power– 52 AC KVA
• Process Water– None required
• Instrument Air– None required
• Sulfite for dechlorination– 2 Kg (7.7L) per 1,000M3 ballast
• Maintenance– 4 hours per month
• Base Unit Cost– $440K
Estimates for 1000 M3 / Hr BWT Unit
Electrolytic Ballast Water Treatment
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2000 M3 / Hr System Dimensions
ITEM DIMENSIONS (M)Length X Width X Height
WEIGHT (Kg)
Generator 2.3 X 0.6 X 2.2 260
Transformer/Rectifier & Control Panel
2.4 X 0.6 X 2.0(1.1 X 1.3 X 2.0)
820(400)
Degas 1.6 X 0.6 X 1.7 91
Booster Pumps 1.2 X 1.2 X 1.6 136
Analyzers 1.4 X 0.4 X 1.5 105
Sulfite Addition 0.4 X 0.3 X 1.1 68
Overall 3.7 X 1.8 X 3.1 3,325
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- Meets IMO standards for Ballast Water Management
- Destruction of living organisms - Bacteria inactivated
- De-chlorinated Effluent is not Toxic- DBPs can be below drinking water
standards- Filtration is not required to meet
IMO standards- Operating cost is less than
$0.02 / M3 of ballast water
Conclusions
Electrolytic Ballast Water Treatment