Presented by Petri Pajuniemi, Flootech ACQUEAU Workshop on Industrial Waste Water Treatment 12 March 2015

1. © Flootech Oy 2012© Flootech Oy 2012
Advanced Process Water and Wastewater Treatment
In a Modern Paper Mill, Case Study
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Acqueau Workshop
Helsinki, Finland
12. 03. 2015
Petri Pajuniemi
VP, Technology
Flootech Oy

2. © Flootech Oy 2012
•
§ Flootech shortly
§ Drivers and challenges in improved water
management
§ Steps to efficient water management
§ Flootech Reference Project
Advanced Water Management in Pulp & Paper Mill
Contents

3. © Flootech Oy 2012
Flootech - Specialist in Water Management
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§
§ Flootech offers state-of-the-art water
treatment technologies with profound
understanding of clients’ processes and
needs
§
§ Specializes in water, process water and
wastewater treatment solutions
§
§ Privately held company with 40 years
history in water treatment
§ Office located in Turku, Finland
§
§ Hundreds of installations worldwide and
decades of experience in pulp&paper
water treatment
§
§
§

4. © Flootech Oy 2012
Flootech Water Treatment Solutions
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5. © Flootech Oy 2012© Flootech Oy 2012
Drivers and Challenges in Improved Water
Management
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Drivers and Challenges in Improved Water Management
Pulp & Paper Making Environmental Goals
§Reduce water pollution
Ø Reduction of toxic chemicals: solvents,
chlorine compounds, organics etc.
§Reduce fresh water consumption and
wastewater amount
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§Minimize energy consumption
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§Minimize solid waste
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⇒ Maintain cost efficiency

7. © Flootech Oy 2012
Drivers and Challenges in Improved Water Management
Drivers for decreasing fresh water consumption and for
improved water management in P&P industry
§ Fresh water purchase or treatment cost
§ Effluent discharge and treatment cost
§ Existing fresh water treatment capacity is too low
§ Existing effluent treatment capacity is limiting water usage
§ Environmental regulations
§ Environmental / marketing strategy (BAT)
§ Low fresh water consumption, but problems with
runnablility
Most likely there are no significant runnability problems, due to the
high fresh water consumption!
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8. © Flootech Oy 2012
Drivers and Challenges in Improved Water Management
“Pros and Cons“ of Reducing Water Consumption
Benefits
Lower operational costs
ETP, WTP and environmental
payments
Improved retention of soluble
material
Saving in raw materials due to
lower losses
Reduced energy consumption
Less water heating and
pumping
Lower total environmental load
Possible Drawbacks
n Higher concentrations of dissolved
and colloidal material, if not
further purified
n Increased microbiological activity
slime problems and deposits
n Risk of corrosion
àRisk of lowering product quality i.e.
(brightness and porosity)
à Lowered runnability
àChallenges with hygienic products
n

9. © Flootech Oy 2012© Flootech Oy 2012
Advanced Paper Mill Water Management
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10. © Flootech Oy 2012
Areas of Efficient Water Management
Paper Mill
Water
Management
Countercurrent
flow principle
Efficient fiber
(raw material)
recovery
Advanced
monitoring of
water flows
Separation of water
systems
Advanced white
water treatmentEfficient and
integrated effluent
treatment Training and
motivation !

11. © Flootech Oy 2012
BAT levels for P&P mills
Examples of RCF, Tissue and Pulp Mills

12. © Flootech Oy 2012© Flootech Oy 2012
Reference
SCA Sahagun, Mexico
Low water consumption tissue mill
Process water and wastewater treatment concept
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13. © Flootech Oy 2012
§ End client, SCA is one of the leading international companies in
manufacturing of personal hygiene, tissue, packaging, paper
products
§ Location: Sahagun, Mexico
§ Capacity: 60 000 ton /year tissue
§ DIP based Tissue Mill
§ Green-field plant project
§ Start-up 2010
§
§
Background & Key facts
“The Most Modern Tissue Mill in the World”
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Principles and chosen concept
Advanced principles for water management (e.g. BAT)
§ Countercurrent water flow principle
§ Fresh water replacement with treated process
water
§ Efficient water and fiber recovery with DAF
technology
§ Efficient and integrated effluent treatment which
allows effluent recycling to pulp dilution
§
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15. © Flootech Oy 2012
FlooDaf for Tissue Mill Save All
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Save all with FlooDaf for recollecting lost
fibers from the mill wire section and clean &
recycle process water
§ Over 95% fiber recovery with DAF
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§ Fibers can be recycled back to
pulping to improve overall raw
material usage
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§ Fresh water saving since treated
water from the DAF is re-used in
process as dilution water, in stock
prep and in showers
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§

16. © Flootech Oy 2012
FlooDaf for DIP Whitewater Treatment
§ The DlP DAF´s role in water loop cleaning is crucial, especially when paper
mill is using waste paper (RCF) as raw material
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§ At Sahagun, DAF is cleaning the
DIP second loop white water
§ Whitewater solids, ash and
stickies are efficiently removed
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§ Continuous > 95% TSS removal
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Improved overall energy balance
by returning water back to the
process

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Waste Water Treatment Plant
Integrated and compact DAF – MBBR - DAF Process
z
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§ Primary Clarifier with FlooDaf® Microflotation
FlooDaf® B35
§ Biological treatment with FlooBed® MBBR
2 pcs 800m3 FlooBed®MBBR, (Moving Bed Biofilm Reactor)
§ Secondary Clarifier with FlooDaf® Microflotation
FlooDaf® B35 with coagulation
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Recycling up to 50%
Approx. 14 m3/t
COD = 1 590 mg/l
BOD = 590 mg/l
SS = 1 350 mg/l
4 400 m³/d

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WWTP key process characteristics
FlooDaf Microflotation primary clarifier 35 m2
FlooBed MBBR

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Waste Water Treatment Plant, WWTP
FlooBed® MBBR + FlooDaf ® Microflotation
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Compact ETP. Less than 900 m2 footprint for the whole plant.

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§ The selected concept and technologies have shown superior performance
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§ Relative water consumption is now approx. 14 m3/t, way below BAT limit
for a DIP tissue mill (25 m3/t )
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§ The local treated wastewater quality demands have been met
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§ Attention to paper mills water management has given substantial
environmental and economical savings
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§ Environmental future of the pulp &paper industry:
à Will go further in the efficiency and quality requirements of water
treatment and lowering the relative water consumption
à
à Provides new opportunities in the water treatment
development and business
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Conclusion

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Thank You