Solving pitch problems in pulp and paper processes by the use of enzymes or fungi

Abstract

Pitch problems in pulp mills are often caused by the resinous materials (pitch) in wood which comprise approximately 2–8% of total composition depending upon the species and time of year. Traditional methods to control pitch problems include natural seasoning of wood before pulping and/or adsorption and dispersion of the pitch particles with chemicals in the pulping and papermaking processes, accomplished by adding fine talc, dispersants and other kinds of chemicals. Within the last five years, two new and different methods of combatting pitch, both of which are biotechnological in basis, have been developed independently and are now used industrially. Hata and colleagues of Nippon Paper Industries developed a pitch control method using the enzyme lipase, which catalyzes the hydrolysis of triglycerides. Farrell and colleagues of Sandoz Chemicals Biotech (now known as Clariant) developed a method of pitch control and biocontrol using a fungus developed in the laboratory from the same type of organisms which cause natural aging, the Ascomycetes. This fungus is non-colored and prevents the staining and decrease of brightness normally associated with aged wood.