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© Flootech Oy 2012 © Flootech Oy 2012 Advanced Process Water and Wastewater Treatment In a Modern Paper Mill, Case Study 1 Acqueau Workshop Helsinki, Finland 12. 03. 2015 Petri Pajuniemi VP, Technology Flootech Oy
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Transcript of ACQUEAU Workshop Helsinki 2015_Pulp&paper session_Petri Pajuniemi_Flootech
© Flootech Oy 2012© Flootech Oy 2012
Advanced Process Water and Wastewater Treatment In a Modern Paper Mill, Case Study
1
Acqueau WorkshopHelsinki, Finland12. 03. 2015
Petri PajuniemiVP, TechnologyFlootech Oy
© 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
© 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
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§ Specializes in water, process water and wastewater treatment solutions
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§ 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
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§
© Flootech Oy 2012
Flootech Water Treatment Solutions
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© Flootech Oy 2012© Flootech Oy 2012
Drivers and Challenges in Improved Water Management
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© Flootech Oy 2012
Drivers and Challenges in Improved Water ManagementPulp & Paper Making Environmental Goals
§Reduce water pollutionØ Reduction of toxic chemicals: solvents,
chlorine compounds, organics etc.
§Reduce fresh water consumption and wastewater amount
§
§Minimize energy consumption§
§Minimize solid waste •
⇒ Maintain cost efficiency
© 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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© Flootech Oy 2012
Drivers and Challenges in Improved Water Management“Pros and Cons“ of Reducing Water Consumption
BenefitsLower 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 Drawbacksn Higher concentrations of dissolved
and colloidal material, if not further purified
n Increased microbiological activity slime problems and deposits
n Risk of corrosionàRisk of lowering product quality i.e.
(brightness and porosity)à Lowered runnabilityàChallenges with hygienic productsn
© Flootech Oy 2012© Flootech Oy 2012
Advanced Paper Mill Water Management
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© Flootech Oy 2012
Areas of Efficient Water Management
Paper Mill Water
Management
Countercurrent flow principle
Efficient fiber (raw material)
recoveryAdvanced
monitoring of water flows
Separation of water systems
Advanced white water treatment Efficient and
integrated effluent treatment Training and
motivation !
© Flootech Oy 2012
BAT levels for P&P millsExamples of RCF, Tissue and Pulp Mills
© Flootech Oy 2012© Flootech Oy 2012
ReferenceSCA Sahagun, Mexico
Low water consumption tissue mill
Process water and wastewater treatment concept
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© 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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© Flootech Oy 2012
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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© 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§
§ Fibers can be recycled back to pulping to improve overall raw material usage§
§ 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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© 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§
§ Improved overall energy balance by returning water back to the process
© Flootech Oy 2012
Waste Water Treatment PlantIntegrated and compact DAF – MBBR - DAF Process
z
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§ Primary Clarifier with FlooDaf® MicroflotationFlooDaf® B35
§ Biological treatment with FlooBed® MBBR 2 pcs 800m3 FlooBed®MBBR, (Moving Bed Biofilm Reactor)
§ Secondary Clarifier with FlooDaf® MicroflotationFlooDaf® B35 with coagulation
§
Recycling up to 50%
Approx. 14 m3/t
COD = 1 590 mg/l BOD = 590 mg/lSS = 1 350 mg/l
4 400 m³/d
© Flootech Oy 2012
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WWTP key process characteristics
FlooDaf Microflotation primary clarifier 35 m2
FlooBed MBBR
© Flootech Oy 2012
Waste Water Treatment Plant, WWTPFlooBed® MBBR + FlooDaf ® Microflotation
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Compact ETP. Less than 900 m2 footprint for the whole plant.
© Flootech Oy 2012
§ The selected concept and technologies have shown superior performance §
§ 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§
§ 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
© Flootech Oy 2012
Thank You
