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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/17237

Title: Pretreatment of Pulp Mill Wastewater Treatment Residues to Improve Their Anaerobic Digestion
Authors: Wood, Nicholas
Advisor: Master, Emma
Tran, Honghi
Department: Chemical Engineering and Applied Chemistry
Keywords: anaerobic digestion
sludge
wastewater treatment
pretreatment
pulp mill
waste activated sludge
Issue Date: 26-Feb-2009
Abstract: Anaerobic digestion of excess biological wastewater treatment sludge (WAS) from pulp mills has the potential to reduce disposal costs and to generate energy through biogas production. The organic matter in WAS is highly structured, which normally hinders biogas production. This study investigated three methods of pretreating WAS from two different pulp mills before anaerobic digestion to improve biogas yield and production rate. The three pretreatment methods tested were: i) thermal pretreatment at 170oC, ii) caustic pretreatment at 140oC and pH 12, and iii) sonication at 20 kHz and 1 W/mL. Thermal pretreatment proved to be the most effective, increasing biogas yield by 280% and 50% and increasing production rates 300-fold and 10-fold for the two samples, respectively. Caustic pretreatment showed similar results, but resulted in the formation of soluble non-biodegradable compounds. Sonication was the least effective pretreatment and did not substantially increase biogas yield, but increased biogas production rate.
URI: http://hdl.handle.net/1807/17237
Appears in Collections:Master
Department of Chemical Engineering and Applied Chemistry - Master theses

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