Abstract
The present work reports the biobleaching effect on OPEFB pulp upon utilisation of extracellular xylano-pectinolytic enzymes simultaneously yielded from Bacillus amyloliquefaciens ADI2. The impacts of different doses, retention times, pH, and temperatures required for the pulp biobleaching process were delineated accordingly. Here, the OPEFB pulp was subjected to pre-treatment with xylano-pectinolytic enzymes generated from the same alkalo-thermotolerant isolate that yielded those of higher quality. Remarkable enhanced outcomes were observed across varying pulp attributes: for example, enzyme-treated pulp treated to chemical bleaching sequence generated improved brightness of 11.25%. This resulted in 11.25% of less chlorine or chemical consumption required for obtaining pulp with optical attributes identical to those generated via typical chemical bleaching processes. Ultimately, the reduced consumption of chlorine would minimise the organochlorine compounds found in an effluent, resulting in a lowered environmental effect of paper-making processes overall as a consequence. This will undoubtedly facilitate such environmentally-friendly technology incorporation in the paper pulp industry of today.
Highlights
To date, many pulp and paper industries in the Asian countries are still employing elemental chlorine (Cl2 ) in their production processes [1], whereby a majority of pulp and paper mills worldwide opt for Elemental Chlorine Free (ECF; ClO2 ) still throughout the bleaching phase [2]
Xylanase and pectinase enzymes sourced from microorganisms have attracted considerable attention due to the biotechnological possibilities offered throughout various industrial processes [4,5]
The isolate was classified as a good producer for their simultaneous production at a ratio of 1:1.3 for xylanase-pectinase enzyme production
Summary
Many pulp and paper industries in the Asian countries are still employing elemental chlorine (Cl2 ) in their production processes [1], whereby a majority of pulp and paper mills worldwide opt for Elemental Chlorine Free (ECF; ClO2 ) still throughout the bleaching phase [2]. Despite the availability of alternative eco-friendly bleaching solutions for pulp mills instead of Cl2 and ClO2 such as prolonged cooking (i.e., oxygenation) and hydrogen peroxide or ozone-based delignification, their introduction is a large-scale and cost-intensive proposal. This is attributable to the need for extensive operation adjustments or improvements, among others. Biobleaching is denoted as a biological technique; enzymes often propose a simple approach enabling the attainment of higher brightness ceiling, especially in the pulp and paper field This can be achieved without necessitating a large investment in resources or expenditure alike [3]. Viewed as biocatalysts in the pulp and paper industry, they facilitate the landscape further due to the consistently shifting climate of manufacturing technologies after rising calls for improved economy, pulp quality, and environmental safety
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