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Journal articles
Magazine articles
Hands-On Service Means Floods Are Gone, Paper360º July/August 2019

Hands-On Service Means Floods Are Gone, Paper360º July/August 2019

Journal articles
Magazine articles
Open Access
Fundamental molecular characterization and comparison of the O, D0, and E stage effluents from hardwood pulp bleaching, TAPPI Journal 2019

ABSTRACT: The present study characterized effluents from the O, D0, and E stages using nuclear magnetic reso-nance (NMR) and gel permeation chromatography (GPC) techniques to better understand the chemical nature of the dissolved organics formed from the bleaching of a high-yield hardwood kraft pulp. Understanding the structures and molecular weight distribution of these organics is the first step in developing methods to mitigate these contam-inates in the discharged effluents. The results indicated that the molecular weight distribution (MWD) of the dis-solved organics from oxygen delignification effluent is broader than those from D0 and E stage effluents. In addition, the O stage filtrate contained considerable amounts of lignin and xylan fragments, which showed its efficiency in removing such materials. The effluent from the D0 stage contained a lower amount of high molecular weight frag-ments and a higher amount of low molecular weight fragments versus the O-stage filtrate. Aromatic structures were nearly absent in the D0 stage filtrate, but the degraded organic material, presumably from oxidized lignin, contained olefinic (C=C) and carbonyl (C=O) functional groups. Furthermore, higher molecular weight fragments were detected in the E-stage effluent, presumably due to the extensive solubilization and removal of the oxidized lignin generated from the D0 pulp.

Journal articles
Magazine articles
Open Access
The sticky behavior of pulp and paper mill biosludge during drying, TAPPI Journal June 2019

ABSTRACT: Pulp and paper mill biosludge becomes sticky after being dried to a certain solids content. As bio-sludge becomes sticky, it agglomerates and adheres to the heat transfer surfaces of the dryer. This undesirable property can lower the dryer efficiency and cause the drying equipment to fail.A systematic study was conducted to examine the sticky behavior of biosludge. The stickiness was evaluated by measuring the adhesive force between a sludge cake and a stainless steel substrate, and the cohesive force between a sludge cake and a sludge substrate. The results show that: i) both adhesive and cohesive forces increase markedly as the solids content increases, reaching a maximum value at about 13% solids, and then decrease steadily at a high-er solids content; ii) cohesive force is stronger than adhesive force, implying that biosludge tends to agglomerate rather than adhere to smooth equipment surfaces; and iii) mixing wood fines or fly ash from a biomass boiler reduc-es the stickiness of the mixture. These findings may help mills improve the thermal efficiency of biosludge dryers and to turn biosludge into a more attractive fuel for burning in biomass boilers.

Journal articles
Magazine articles
North America’s First Tree-Free Pulp Mill, Paper360º March/April 2019

North America’s First Tree-Free Pulp Mill, Paper360º March/April 2019

Journal articles
Magazine articles
World BioEconomy Forum: Major Opportunities for the Pulp and Paper Industries, Paper360º March/April 2019

World BioEconomy Forum: Major Opportunities for the Pulp and Paper Industries, Paper360º March/April 2019

Journal articles
Magazine articles
Problems Solved: Tracking True for Success, Paper360º March/April 2019

Problems Solved: Tracking True for Success, Paper360º March/April 2019

Journal articles
Magazine articles
Getting to World Class Reliability & Maintenance with Visual Reminders, Paper360º March/April 2019

Getting to World Class Reliability & Maintenance with Visual Reminders, Paper360º March/April 2019

Journal articles
Magazine articles
Global or Local: Does Mill Location Make a Difference?, Paper360º March/April 2019

Global or Local: Does Mill Location Make a Difference?, Paper360º March/April 2019

Journal articles
Magazine articles
ASPI News, Paper360º March/April 2019

ASPI News, Paper360º March/April 2019

Journal articles
Magazine articles
Open Access
A novel approach for determining the reactivity of dissolving pulp based on the COD method

ABSTRACT: A novel approach for determining the reactivity of dissolving pulp according to the chemical oxygen demand (COD) of water has been discussed. First, a sample of dissolving pulp was subjected to mercerization and xanthation in order to obtain dissolved cellulose fractions. Next, the fractions were digested with a testing solution as applied in COD procedures. Finally, the resulting liquid was rapidly tested by ultraviolet-visible spectrophotometry (UV-Vis). By quantifying the absorbance of Cr3+ at a wavelength of 600 nm, the reactivity of dissolving pulp was indirectly calculated. The results measured by this novel COD method correlated well with the most accepted Fock test results with less than 10% relative difference. Meanwhile, this newly developed COD method required less time-consuming procedures as compared to the Fock test.

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