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

Article

Harris, Peter W., 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. https://doi.org/10.1016/j.biortech.2017.07.179
Article Title

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

ERA Journal ID3454
Article CategoryArticle
AuthorsHarris, Peter W. (Author), Schmidt, Thomas (Author) and McCabe, Bernadette K. (Author)
Journal TitleBioresource Technology
Journal Citation244 (1), pp. 605-610
Number of Pages6
Year2017
PublisherElsevier
Place of PublicationNetherlands
ISSN0960-8524
1873-2976
Digital Object Identifier (DOI)https://doi.org/10.1016/j.biortech.2017.07.179
Web Address (URL)http://www.sciencedirect.com/science/article/pii/S0960852417312956?via%3Dihub
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.

KeywordsFat, oil and grease, abattoir, biomethane potential, alkali, biogas, dissolved air flotation sludge
ANZSRC Field of Research 2020300199. Agricultural biotechnology not elsewhere classified
419999. Other environmental sciences not elsewhere classified
310602. Bioprocessing, bioproduction and bioproducts
Public Notes

Open access article.

Byline AffiliationsNational Centre for Engineering in Agriculture
Institution of OriginUniversity of Southern Queensland
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