1 seair diffusion systems inc. pulp & paper solutions june 2009
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Seair Diffusion Systems Inc.
Pulp & Paper Solutions
June 2009
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• Diffusion towers used to replace traditional blower systems• Reduce aeration power consumption by up to 80%, which frees up more power for
production line and ultimately increases overall plant production• Achieve higher dissolved oxygen levels, which allows for more use of high-value
hardwood feedstock• Reduce maintenance
• Started by testing (and subsequently purchasing) a small unit, now the much larger SA600 is being used
• DO levels over 3-4 ppm versus 0.6-1.4 prior to SA600 start-up
• Initial implementation at Canfor`s pulp mill in Taylor, B.C.
Pulp & PaperPulp & Paper
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• Diffuse ambient air, through Seair’s patented diffusion tower, into mill aeration pond
• Primary objective is to increase pond dissolved oxygen levels
Current Pulp & Current Pulp & Paper ApplicationsPaper Applications
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• Increase dissolved oxygen (“D.O.”) levels to …
Operational and Operational and Business DriversBusiness Drivers
… achieve/maintain compliance with discharge water standards
… Convert anaerobic pond to aerobic condition, thereby facilitating biological cleaning/remediation
… be able to run more frequently/longer on higher value, but oxygen consuming, hardwood feedstock
… reduce/eliminate odour
• Higher D.O. levels achieved with significantly lower power consumption than alternative methods (up to 80% horsepower reduction relative to coarse bubble blowers)
• Extremely low maintenance requirements
• Allows maximum reuse of water
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• Started by testing (and subsequently purchasing) a small unit
• Subsequently added the much larger SA600
• Aeration pond D.O. levels over 3-4 ppm versus 0.6-1.4 prior to SA600 start-up
• Installation at Canfor`s pulp mill in Taylor, B.C.
Case Example – Case Example – Canfor (Taylor, B.C.)Canfor (Taylor, B.C.)
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Canfor Pulp Mill
Taylor, British Columbia
Canfor Pulp Mill
Taylor, British Columbia
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• 4 x 900 Horsepower Blowers (energy cost of approx. $975K)• 4 x 200Hp Aeration Mixers• 2 x 50hp Berm Mixers
Aeration System – Aeration System – Prior to Seair InstallationPrior to Seair Installation
• System Designed to handle Biological Oxygen Demand (BOD) loads of 20,000-45,000 kg/day BOD. Hardwood species have higher BOD loads than softwood. Hardwood production has improved dramatically the last year.
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• SA600 installed when temperatures were -40o C, or worse
• Units have been operating trouble free for two years
Seair Equipment Installed Seair Equipment Installed in Dead of Winterin Dead of Winter
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Graph 1: Consume of Power Usage with Graph 1: Consume of Power Usage with Trial Units InstalledTrial Units Installed
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Data and AnalysisData and Analysis
Table 1: Effluent Treatment Performance – Seair A400 and A600 Pilot Units
CaseInlet COD (mg)
Outlet COD (mg)
Average DO
Total Amps
Effluent Flow m3
COD Reduction
COD Redn/Amp
One Year Pre- Installation 4972 437 2.23 650 18051 4535 7.3
2007 Pre- Installation 4835 419 2.15 669 18309 4415 6.9
A400 Only 5823 481 1.84 689 18008 5341 8.2
A400 and A600 5351 406 2.1 545 18033 4945 9.5
Table 2: Preliminary Savings Calculations: A400 plus A600 Pilot Units
AMPS VOLTS KW HRS MWH Value/Year
105.4 2400 393.8 8700 3426 $ 263,781
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Craig ThomsonEnergy and Environmental Supervisor
Canfor Mill, Taylor B.C.
“System at its finest”
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• Mill has 2×1800Hp aeration blowers.
• Pond pushed passed design, straining aeration system
• Installed 2 Seair SA600 systems to diffuse ambient air into aeration pond
• Trial Installation at Millar Western`s pulp mill in Whitecourt, Alberta
Case Example – Case Example – Millar Western Millar Western (Whitecourt, Alberta)(Whitecourt, Alberta)
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• Tank based protocol used to determine residence time and efficiency.
Millar Western -Millar Western - Implementation ObjectivesImplementation Objectives
• Test determined a success, DO remained above 3 ppm for excess of 20min.
• Demonstrated the resonance time of the microbubble and transfer efficiency.
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• Black and White liquor oxidation
Other ApplicationsOther Applications
• Pulp oxidation and bleaching with oxygen and ozone.
• Color removal for water.
• Effluent oxygenation for discharge
• Water recycling.
• Make up water treatment
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For More Information Please Contact
Harold Kinasewich- President and CEO
9554 Yellowhead TrailEdmonton, AlbertaCANADAT5G 0W4tel. 780-477-7188fax. 780-477-2523
www.seair.ca