Ecf and TCF Bleaching of Saccharum Officinerum-Co89003 Bagasse Soda-Aq Pulp With Alkali-Thermo-Tolerant Crude Xylanase From Coprinellus Disseminatus Sw-1 Ntcc1165

Abstract

An alkali-thermo-tolerant crude xylanase from Coprinellus disseminatus SW-1 NTCC1165 produced under solid-state fermentation conditions improves the brightness of sugarcane bagasse soda-AQ pulp by 7.3, 4.7, 6.1, and 8.2% in XODED, XOD(E OP )DP, OX(E OP )P, and XO(E OP )P bleaching sequences, respectively, at an enzyme dose of 8IU/g, a reaction time of 120 min, a consistency of 10%, and a pH of 6.4 at 55 o C. An improvement in brightness by 2.1% for pulp bleached by XO(E OP )P compared to OX(E OP )P sequence validates that xylanase treatment is more effective for hydrolysing lignin-carbohydrates complexes before oxygen treatment. AOX after XODED and XOD(E OP )DP sequences is reduced by 41.43 and 40%, respectively, compared to controls, but an increase in COD and color in studied bleaching sequences is attributable to the hydrolysis of hemicelluloses and the release of lignincarbohydrates complexes after xylanase treatment. Xylanase treatment modifies fibre surface by introducing cracks, peelings, swelling, and external fibrillation, which facilitates faster penetration of bleach chemicals by disrupting physical barriers, as revealed by scanning electron microscopy.

Understanding the Effect of Machine Technology and Cellulosic Fibers on Tissue Properties – A Review

“…Around 60% to 70% of bagasse mass is composed of useful fibers. The remaining mass is represented by non-fibrous parenchyma cells (pith) and soluble matter (Agnihotri et al 2010;Lois-Correa 2012). Due to its high content of pith, bagasse has high dewatering resistance and poor paper properties (Rainey 2012).…”

“…The high quantity of ashes cannot be considered so problematic since the silica-based salts are negligible. High hemicellulose content benefits the paper strength (Agnihotri et al 2010).…”

Influence of mechanical operation on the biodelignification of Leucaena leucocephala by xylanase treatment

“…The pulp also showed an improvement in brightness due to selective delignification. The xylan removal enhanced the degree of external fibrillation on fiber surface, which improved the tear index after xylanase pretreatment of bagasse pulp (Agnihotri et al 2012). Zou et al (2002) demonstrated that hemicelluloses, specifically xylan, could act as protective factors against cellulose degradation.…”

Delignification of L. leucocephala and C. equisetifolia through kraft pulping and mitigation of vessel picking

“…These include non-woody plants such as C. sativa, I. carnea (Dutt and Tyagi 2010), H. cannabinus, H. sabdariffa (Upadhyaya et al 2008), S. aculeata, and S. sesban (Dutt et al 2004(Dutt et al , 2005. Agricultural residues including sugarcane bagasse and wheat straw (Agnihotri et al 2010;Singh et al 2011), fast-growing hardwoods such as C. equisetifolia (Maan et al 2018) and L. leucocephala (Poonam and Dutt 2014;Maan and Dutt 2017), and waste papers have also been investigated. L. leucocephala and C. equisetifolia are two fast-growing hardwoods that belong to the families of Fabaceae and Casuarinaceae, respectively.…”