Method for reducing amount of bacterial endospores in an aqueous fibre suspension
AssigneeKemira Oyj
InventorsMarko Kolari, Juhana Ahola
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for reducing bacterial endospores in an aqueous fibre suspension comprising recycled cellulosic fibres, wherein the fibre suspension has an original endospore amount, preferably of ≥10 000 CFU/ml. The method comprises adjusting the pH of the fibre suspension to a pH value of ≤6.5, adjusting the oxidation-reduction potential (ORP) of the fibre suspension to an ORP value of ≥200 mV with a first oxidizing agent, and introducing an amount of performic acid as a second oxidizing agent to the fibre suspension for reducing the bacterial endospores to an endospore amount of ≤1000 CFU/ml.
Claims16
A method for reducing bacterial endospores in an aqueous fibre suspension comprising recycled cellulosic fibres, wherein the fibre suspension has an original bacterial endospore amount, the method comprising
- (a) adjusting pH of the fibre suspension to a pH value of ≤6.5,
- (b) adjusting oxidation-reduction potential (ORP) of the fibre suspension to an ORP value of ≥200 mV with a first oxidizing agent, and
- (c) introducing an amount of performic acid as a second oxidizing agent to the fibre suspension for reducing the original bacterial endospore amount to an endospore amount of ≤1000 CFU/ml.
Dependencies are inferred from the claim text.