High-yield kraft pulping of Eucalyptus grandis Hill ex Maiden biotreated by Ceriporiopsis subvermispora under two different culture conditions

Abstract

In the present study, it was evaluated how two different culture conditions for the biotreatment ofEucalyptus grandisbyCeriporiopsis subvermisporaaffect a subsequent high-yield kraft pulping process. Under the varied culture conditions investigated, different extracellular enzyme activities were observed. Manganese-peroxidase (MnP) secretion was 3.7 times higher in cultures supplemented with glucose plus corn-steep liquor (glucose/CSL) as compared to non-supplemented (NS) cultures. The biotreated samples underwent diverse levels of wood component degradation as losses of weight and lignin were increased in glucose/CSL cultures. Mass balances for lignin removal during kraft pulping showed that delignification was facilitated when both biotreated wood samples were cooked. Delignification efficiency did not correlate positively with MnP levels in the cultures. On the other hand, biopulps from NS and glucose/CSL cultures saved 27% and 38% beating time to achieve 28° Schopper-Riegler freeness during refining, respectively. Biopulps disposed of decreased tensile and tear resistances, thus easier refining of the biokraft pulps seems to be a consequence of less resistant fiber walls. Improved beatability of biopulps was tentatively related to short fibers and fines formation during refining. We suggest that to some extent polysaccharide depolymerization occurred during the biotreatment, which also resulted in diminished pulp yields in the case of glucose/CSL cultures.

The effects of fungi pre-treatment of poplar chips on the kraft fiber properties

“…2 that in addition to decreasing the weight percent in fine fraction as shown in pulp classification data, the length average fine length frequency [fine(l)] and number average fiber number frequency [fine(n)] of the poplar kraft pulp was also reduced by fungi pre-treatment. This result is in agreement with the works of Myers et al (2000), Zhao et al (2002) and Vicentim et al (2009).…”

“…The lower level of fine fraction in fungi pre-treated pulp samples, and consequent higher percent of long fiber fraction at almost constant level of medium fiber fraction may be explained by partial elimination of these primary fines during fungi pre-treatment. Lower fine fraction and higher percent of flexible fiber with more collapsibility in fungi pretreated kraft pulp may produce a paper with improved quality (Pulkkinen et al, 2006;Vicentim et al, 2009;Masarin et al, 2009). …”

Effect of Biological Pretreatment with White-rot Fungus Trametes hirsuta C7784 on Lignin Structure in Carex meyeriana Kunth

“…It allows for loosening the structure of lignocelluloses without utilizing and releasing environmentally harsh chemicals. In fact, the biological pretreatment has been used to pretreat wood in the pulping process to save energy as well as to improve the pulp quality (Lei et al 2012;Masarin et al 2009;Vicentim et al 2009). In addition, the utilization of biological pretreatment for the production of biofuels has received increasing attention nowadays.…”

Multivariate-parameter optimization of the alkaline peroxide mechanical pulp (APMP) process for larch (Larix gmelinii Rupr.) using Box-Behnken design

“…This research area has numerous variations concerning the raw materials (including annual plants, hardwoods, softwoods), aspects of chemistry and refining (pulping chemicals, pretreatments, refiners), and analysis as revealed in the recent literature (Hedjazi et al 2008(Hedjazi et al , 2009Iakovlev et al 2009;Vicentim et al 2009;Al-Dajani and Tschirner 2010;Liu et al 2010;Hörhammer et al 2011;Yamamoto et al 2011;Zhang et al 2011a;Hafrén et al 2012). Many of them are based on the bleached chemo-thermomechanical pulping (BCTMP), alkaline peroxide mechanical pulping (APMP), and preconditioning refiner APMP of hardwood.…”