Biomechanical and biochemical pulping of sugarcane bagasse with Ceriporiopsis subvermispora fungal and xylanase pretreatments.
Sugarcane bagasse was pretreated with both the white-rot fungus, Ceriporiopsis subvermispora, and xylanase enzyme for 2 weeks before soda chemithermomechanical (CTMP) and soda chemical (CP) cooking. For fungi-CTMP (BCTMP) and enzyme-fungi-CTMP (EBCTMP), the bagasse, after bio-pretreatment, was cooked with 5% sodium hydroxide, at 130 degrees C for 20 min. For the chemical pulping (CP), after fungi pretreatment (BCP) or after xylanase and fungal pretreatment (EBCP), the bagasse was cooked with 14.5% sodium hydroxide. With the BCTMP, the Klason lignin was reduced, all of the pulp strength properties were increased, and a 28% savings in refining energy consumption was obtained, but the brightness was reduced 5 points compared to the control. With the EBCTMP, the brightness losses were overcome but with a mild reduction in the pulp strength properties compared to the BCTMP. The energy savings were 5% greater than from BCTMP and 33% over the control. The BCP treatment increases somewhat the pulp strength properties, reduces the energy consumption 23%, and reduces the brightness by 9 points compared to the control; however, the kappa no. was 5.5 points higher than the control. EBCP treatment reduces brightness losses and increases the pulp yield 2% compared to the control, but with some reduction in the strength properties compared to BCP.
Ramos
J
J
Department of Wood, Cellulose and Paper, University of Guadalajara, Guadalajara, Jalisco, Mexico.
González
M
M
Ramírez
F
F
Young
R
R
Zúñiga
V
V
D001487:Basidiomycota / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002482:Cellulose / Q000378:metabolism*; D003603:Cytotoxins / Q000378:metabolism; D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D010209:Paper; D012972:Sodium Hydroxide; D013395:Sucrose; D043325:Xylan Endo-1,3-beta-Xylosidase; D014995:Xylosidases / Q000378:metabolism*
D003603:Cytotoxins; D012972:Sodium Hydroxide; D013395:Sucrose; D002482:Cellulose; C027433:bagasse; D014995:Xylosidases; D043325:Xylan Endo-1,3-beta-Xylosidase