Post on 29-May-2015
description
Added value for tissue makers created by
efficient chlorine-free microbe control program Jaakko Ekman, Roberto Zulian, James Atkinson, Jordi Sanchez, Marko Kolari,
Amerigo Salvetti (LucartGroup) and Juha Rintala
Content
• Introduction to Performic Acid (PFA) technology
• Case story from Lucart PM 7 in Italy
• Experiences from other mill cases
• Conclusions
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Performic acid (PFA) chemistry
• Produced on-site from formic acid
and hydrogen peroxide
HCOOH + H2O2 → HCOOOH + H2O
• PFA product is never pure Performic
acid, it is always an equilibrium
solution containing Performic Acid,
Formic acid and Hydrogen Peroxide
• PFA has a short life-time, thus it can
not be stored or transported
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PFA is a green disinfection agent with
very high performance
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10
100
1000
10000
100000
1000000
10000000
0 2 4 6 8 10 12 14 16
Am
ou
nt
of
via
ble
bac
teri
a,
cfu
/ml
Biocide dose, ppm active substance
Efficiency of Performic acid vs. Peracetic acid in Paper Mill Water
Peracetic acid
Performic acid
PFA advantages
• Fast acting and very efficient
• Kills microbes within a very short contact time, leaving formic acid and
water as intermittent residuals
Fully biodegradable to H2O and CO2
• Free of chlorine and bromine
• Less corrosive ions in the white water system
• No AOX released to environment
• Safer for process surfaces, workers and environment
• No toxic traces or dangerous disinfection by-products
• No corrosion
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Case story: Lucart PM 7
• Located in Borgo a Mozzano, Toscana, Italy
• PM7 is a high speed (on average 1900 m/min) crescent former machine
producing premium bathroom tissue and wet strength grades
• Production: about 70 000 t/year, grammage 15 – 24 g/m2
• Raw material: 100 % virgin fiber
• Water usage: 5 to 8 m3/t
• PFA replaced organic biocide program at the beginning of July 2012
• Current program design
Continuously to fresh water;
Clarified water;
Wire pit
• In addition, organic biocide is used for sludge treatment
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PFA equipment
Hydrogen Peroxide
FENNOSPEC 7810
FENNOSAN PFA
PREPARATION UNIT
INSTALLATION AT LUCART PM7
• Tailor made for accurate and safe dosing
• Automated and easy to use
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Lucart PM7 results (1)
Microbial level clearly lower than during previous treatment!
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100
1000
10000
100000
1000000
Softwoodpulp
Hardwoodpulp
Whitewater
DAF Clarifiedwater
Pulperwater
Freshwater
AT
P (
RL
U)
Previoustreatment
Kemira I (13.7. -17.8.2012)
Kemira II (20.8. -4.9.2012)
Kemira III (6.9. -27.9.2012)
Kemira IV (2.10. -11.10.2012)
• Machine efficiency significantly improved, including a
new production record
• Felt life-time has increased 50 % (from 70 - 90 days to
180 days)
• PFA reacts less with other additives than previous biocide
program
• Program works effectively by treating waters only
• Competitive cost versus competition
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Lucart PM7 results (2)
Experiences from other mill cases
Mill A:
• 60 – 70 % less breaks during PFA treatment than before
during Monochloramine (AmBr) treatment
• Visibly much cleaner machine
• Longer felt life: earlier 120 d, now more than 200 d
• Better retention, confirmed by lower consistency of white
water
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Experiences from other mill cases
Mill B:
• Earlier with organic biocides, the mill had problems with
toxic traces in end product. After PFA treatment started, no
toxic end-product has been found
• Better working environment: Less bacteria in spray
waters, no biocide smells, no anaerobic bacteria because of
the higher redox level
• No corrosion problems during two years of PFA treatment
• Productivity has increased (also other factors involved)
• Better felt performance
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Conclusions
PFA is a green sterilizing agent for tissue machines with
several benefits:
• Efficient microbe control → clean machine, excellent
runnability
• Safe program for both environment and operators
• Completely biodegradable → no toxic traces in end product
or waste water – No AOX generation
• Longer felt life → additional savings
• Not corrosive → less maintenance costs
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Disclaimer:
Performic Acid (PFA) is currently not registered as a pesticide
in the USA or Canada and thus it is not available for sale in
either country. This presentation is for informational purposes
only and is not an offer for sale.
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