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Biomechanical and Biochemical Pulping of Sugarcane Bagasse with Ceriporiopsis subvermispora Fungal and Xylanase Pretreatments

2001; American Chemical Society; Volume: 49; Issue: 3 Linguagem: Inglês

10.1021/jf0011586

1520-5118

Juan Ramos, Mercedes González, Felipe Ramírez, Raymond A. Young, Virgilio Zúñiga,

Enzyme Production and Characterization

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 °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. Keywords: Biotechnology; biomechanical pulping; biochemical pulping; mechanical properties; optical properties; Ceriporiopsis subvermispora; sugarcane bagasse; energy consumption; scanning electron microscopy