O PAPEL vol. 84, N.o 5, pp. 84 - 89 - MAY 2023

Marko Kolari1
, Petteri Suominen1
, Arno De Beer2
, Juliano Santos3
, Karoliina Markkula4
, Sally Yan4
, Tianxing Wen4
, Jaakko Simell1 1
 Kemira Oyj, Finland. 
2 Kemira Chemicals NV/SA, Netherlands.
3 Kemira Chemicals Inc., Brazil.
4 Kemira Asia Co., Ltd, China.

Paper manufacturing in the neutral-alkaline pH range 
requires a rigorous microbiological control program in 
order to avoid runability issues caused by slime growth on 
machine surfaces. Oxidative biocides, especially stabilizedchlorine compounds, are most commonly used in wet-end 
for controlling pink slime growth. However, chlorinebased programs do contain the risk of causing machine 
corrosion damages as an unintended and costly side effect. 
Running with significantly lower chlorine levels would 
naturally alleviate the corrosion issue, however, it can result 
in massive uncontrolled slime growth. Therefore, it would 
be beneficial to discover a new antibiofilm chemistry, 
specifically targeting surface-attached bacteria. Using this 
kind of biofilm-targeted chemistry would enable reducing 
the chlorine dosing, without facing pink-slime issues. 
In a university collaboration project, a large library of 
molecules was screened with the purpose of identifying a 
promising new antibiofilm chemistry. The project led to the 
identification of a new molecule, B11. This paper shows the 
results obtained from the first B11 tests in authentic paper 
making conditions. It demonstrated biofilm inhibition at a 
uniquely low concentration of 0.05 mg/l. At this dosage level, 
its magnitudes are more effective than any organic biocide 
molecules currently on the market. This new technology 
has great potential to become the antibiofilm product of 
choice, when reduction of chlorine-chemistries is perceived 
as beneficial. This could become necessary due to on-going 
corrosion issues with machinery or in connection with 
water system closure project. A biocide program including 
a very low daily consumption of B11 and reduced dose of 
chlorine-compounds enables running a paper machine with 
maximized corrosion safety and effective biofilm control. 

Keywords: paper machine, microbiological control, biocide, 
biofilm, slime, chlorine, corrosion

Corresponding Author: Marko Kolari, Research Fellow, Kemira Oyj. Espoo R&D Center, Luoteisrinne 2, 02270 Espoo, Finland. 
Phone: +358-40-5249-279.

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