Evaluation of chemical, thermobaric and thermochemical pre-treatment on anaerobic digestion of high-fat cattle slaughterhouse waste

Harris, Peter W. and Schmidt, Thomas and McCabe, Bernadette K. (2017) Evaluation of chemical, thermobaric and thermochemical pre-treatment on anaerobic digestion of high-fat cattle slaughterhouse waste. Bioresource Technology, 244 (1). pp. 605-610. ISSN 0960-8524

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Abstract

This work aimed to enhance the anaerobic digestion of fat-rich dissolved air flotation (DAF) sludge through chemical, thermobaric, and thermochemical pre-treatment methods. Soluble chemical oxygen demand was enhanced from 16.3% in the control to 20.84% (thermobaric), 40.82% (chemical), and 50.7% (thermochemical). Pre-treatment altered volatile fatty acid concentration by −64% (thermobaric), 127% (chemical) and 228% (thermochemical). Early inhibition was reduced by 20% in the thermochemical group, and 100% in the thermobaric group. Specific methane production was enhanced by 3.28% (chemical), 8.32% (thermobaric), and 8.49% (thermochemical) as a result of pre-treatment. Under batch digestion, thermobaric pre-treatment demonstrated the greatest improvement in methane yield with respect to degree of pre-treatment applied. Thermobaric pre-treatment was also the most viable for implementation at slaughterhouses, with potential for heat-exchange to reduce pre-treatment cost. Further investigation into long-term impact of pre-treatments in semi-continuous digestion experiments will provide additional evaluation of appropriate pre-treatment options for high-fat slaughterhouse wastewater.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Open access article.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 23 Jan 2018 05:15
Last Modified: 02 May 2018 00:40
Uncontrolled Keywords: Fat, oil and grease, abattoir, biomethane potential, alkali, biogas, dissolved air flotation sludge
Fields of Research : 10 Technology > 1001 Agricultural Biotechnology > 100199 Agricultural Biotechnology not elsewhere classified
05 Environmental Sciences > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified
10 Technology > 1003 Industrial Biotechnology > 100302 Bioprocessing, Bioproduction and Bioproducts
Socio-Economic Objective: B Economic Development > 85 Energy > 8505 Renewable Energy > 850599 Renewable Energy not elsewhere classified
B Economic Development > 83 Animal Production and Animal Primary Products > 8398 Environmentally Sustainable Animal Production > 839803 Management of Liquid Waste from Animal Production (excl. Water)
B Economic Development > 83 Animal Production and Animal Primary Products > 8398 Environmentally Sustainable Animal Production > 839804 Management of Solid Waste from Animal Production
Identification Number or DOI: 10.1016/j.biortech.2017.07.179
URI: http://eprints.usq.edu.au/id/eprint/33170

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