Bio-modification of eucalyptus chemithermomechanical pulp

Abstract

Eucalyptus chemithermomechanical pulp (CTMP) was modified with the white-rot fungus 19-6 in a stationary culture condition. Different factors that influence the effect of white-rot fungus treatment, including additional nutrition, pH value, temperature, treatment time and oxygen input were investigated. The results show that the energy consumption of post refining of CTMP treated by white-rot fungus 19-6 was lower than that of untreated pulp and the strength properties also obviously improved. At a freeness level of about 330 mL, compared to the untreated pulp, the tensile index, tear index and internal bonding strength increased by 21.3%, 27.4% and 33.1%, respectively. Unfortunately, the treatment with white-rot fungus substantially decreased all optical properties except for opacity, which was essentially unchanged. Brightness and light scattering coefficient were reduced to as much as 25% and 21% compared to the untreated pulps. However, after a tow-stage “Na₂S₂O₄–H₂O₂” bleaching, the final brightness can reach 70.3% ISO, which is similar to that of the untreated CTMP.

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