Bleached kraft pulp mills generate large volumes of effluents usually treated by biological processes that don´t remove recalcitrant organic constituents. The present study was undertaken to evaluate the potential electrocoagulation acid (AcF) and alkaline (AlF) bleaching filtrates with Al Fe electrodes improve their biotreatability. Response surface methodology used predict effects initial pH,...

Abstract Gaining insight into the oxidation of hardwood kraft fibres using hydrogen peroxide at mildly acidic conditions was main aim this study. The oxidized pulp had an increased number carbonyl groups and, when formed sheets, enhanced durability in water seen due to formation cross-links, known as hemiacetals. were found be mainly ketones with exception case longer reaction times (60–90 minu...

The addition of a phosphonated chelant (DTPMPA) at different points of a TCF bleaching sequence and its effect on pulp properties were studied in this work. An industrial Eucalyptus grandis kraft pulp was submitted to a counter-ion exchange (Ca or Na form) and was then bleached using DTPMPA in the washing or in the bleaching stages of two distinct sequences: OOpP and OQOpP (20 pulps). The count...

Microbial enzymes such as xylanases enable new technologies for industrial processes. Xylanases (xylanolytic enzyme) hydrolyze complex polysaccharides like xylan. Research during the past few decades has been dedicated to enhanced production, purification, and characterization of microbial xylanase. But for commercial applications detailed knowledge of regulatory mechanisms governing enzyme pro...

Thermoplastic composite materials containing wood fibers are gaining increasing interest in the manufacturing industry. One approach is to use nano- or micro-size cellulosic fibrils as additives and to improve the mechanical properties obtainable with only small fibril loadings by exploiting the high aspect ratio and surface area of nanocellulose. In this study, we used four different wood cell...