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Pre-Treatment To Enhance Biogas Yield from Pulp and Paper Mill Sludge
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.ORCID iD: 0000-0002-0380-3533
2014 (English)In: Journal of Chemistry and Chemical Engineering, ISSN 1934-7375, E-ISSN 1934-7383, no 8, 825-833 p.Article in journal (Refereed) Published
Abstract [en]

The purpose of this work was to study the potential to enhance biogas production from pulp and paper mill sludge by the use of thermal pre-treatment in combination with chemical pre-treatment. Biogas from waste is a renewable fuel with very low emissions during combustion. To further reduce the use of fossil fuels, more biogas substrates are necessary. Pulp and paper mill sludge is a large untapped reservoir of potential biogas. Pulp and paper mill sludge was collected from a mill that produces both pulp and paper and has a modified waste activated sludge system as part of its wastewater treatment. Pre-treatments were chosen heat (70 oC or 140 oC) combined with either acid (pH 2 or pH 4) or base (pH 9 or pH 11, obtained with Ca(OH)2 or NaOH). Biogas potential was tested by anaerobic digestion batch assays under mesophilic conditions. All pre-treatments were tested in six replicates. Biogas volume was measured with a gas-tight syringe and methane concentration was measured with a gas chromatograph. The methane yield from sludge subjected to thermal pre-treatment at 70 oC did not differ from the untreated sludge, but thermal pre-treatment at 140 oC had a positive effect. Within the 70 oC thermal pre-treatment group, the pH 2 acid was the most successful chemical pre-treatment, and Ca(OH)2 pH 9 had the least effect with no measurable improvement in methane yield. For the 140 oC thermal pre-treatment group, acid and NaOH impacted methane production negatively, while the Ca(OH)2-treated sludge did not differ from sludge with no chemical pre-treatment. In conclusion, thermal pre-treatment at 70 oC showed no effect, whereas, pre-treatment at 140 oC improved methane yield with 170%, and for this sludge additional, chemical pre-treatments are unnecessary.

Place, publisher, year, edition, pages
Libertyvill IL: David Publishing Company, 2014. no 8, 825-833 p.
Keyword [en]
Anaerobic, biogas, digestion, pre-treatment, sludge.
National Category
Engineering and Technology Water Treatment
Research subject
Environmental and Energy Systems
Identifiers
URN: urn:nbn:se:kau:diva-34408DOI: 10.17265/1934-7375/2014.08.011OAI: oai:DiVA.org:kau-34408DiVA: diva2:755971
Available from: 2014-10-15 Created: 2014-10-15 Last updated: 2015-09-09Bibliographically approved

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