Transformation and removal of wood extractives from pulp mill sludge using wet oxidation and thermal hydrolysis

S Baroutian; M Robinson; Anne-Marie Smit; S Wijeyekoon; D Gapes

doi:10.1016/j.biortech.2013.07.098

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Transformation and removal of wood extractives from pulp mill sludge using wet oxidation and thermal hydrolysis

Journal article

Peer reviewed

Transformation and removal of wood extractives from pulp mill sludge using wet oxidation and thermal hydrolysis

S Baroutian, M Robinson, Anne-Marie Smit, S Wijeyekoon and D Gapes

Bioresource Technology, Vol.146, pp.294-300

2013

DOI: https://doi.org/10.1016/j.biortech.2013.07.098

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Abstract

wet oxidation

thermal hydrolysis

pulp mill sludge

wood extractives

In order to remove wood extractive compounds from pulp mill sludge and thereby enhancing anaerobic digestibility, samples were subjected to either oxidative hydrothermal treatment (wet oxidation) or non-oxidative hydrothermal treatment (thermal hydrolysis). Treatments were carried out at 220. °C with initial pressure of 20. bar. More than 90% destruction of extractive compounds was observed after 20. min of wet oxidation. Wet oxidation eliminated 95.7% of phenolics, 98.6% fatty acids, 99.8% resin acids and 100% of phytosterols in 120. min. Acetic acid concentration increased by approximately 2. g/l after 120. min of wet oxidation. This has potential for rendering sludge more amenable to anaerobic digestion. In contrast thermal hydrolysis was found to be ineffective in degrading extractive compounds. Wet oxidation is considered to be an effective process for removal of recalcitrant and inhibitive compounds through hydrothermal pre-treatment of pulp mill sludge.

Details

Title: Transformation and removal of wood extractives from pulp mill sludge using wet oxidation and thermal hydrolysis
Authors: S Baroutian (Author) - Scion, New Zealand
M Robinson (Author) - Scion, New Zealand
Anne-Marie Smit (Author) - Scion, New Zealand
S Wijeyekoon (Author) - Scion, New Zealand
D Gapes (Author) - Scion, New Zealand
Publication details: Bioresource Technology, Vol.146, pp.294-300
Publisher: Elsevier Ltd.
Date published: 2013
DOI: 10.1016/j.biortech.2013.07.098
ISSN: 0960-8524
Organisation Unit: University of the Sunshine Coast, Queensland; Forest Industries Research Centre
Language: English
Record Identifier: 99450713702621
Output Type: Journal article

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