Bovine bile as a bio-surfactant pre-treatment option for anaerobic digestion of high-fat cattle slaughterhouse waste

Article


Harris, Peter W., Schmidt, Thomas and McCabe, Bernadette K.. 2018. "Bovine bile as a bio-surfactant pre-treatment option for anaerobic digestion of high-fat cattle slaughterhouse waste." Journal of Environmental Chemical Engineering. 6 (1), pp. 444-450. https://doi.org/10.1016/j.jece.2017.12.034
Article Title

Bovine bile as a bio-surfactant pre-treatment option for anaerobic digestion of high-fat cattle slaughterhouse waste

ERA Journal ID200987
Article CategoryArticle
AuthorsHarris, Peter W. (Author), Schmidt, Thomas (Author) and McCabe, Bernadette K. (Author)
Journal TitleJournal of Environmental Chemical Engineering
Journal Citation6 (1), pp. 444-450
Number of Pages7
Year2018
Place of PublicationNetherlands
ISSN2213-3437
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jece.2017.12.034
Web Address (URL)http://www.sciencedirect.com/science/article/pii/S2213343717306723
Abstract

Bovine bile was assessed as a novel bio-surfactant pre-treatment to enhance anaerobic digestion of lipid-rich dissolved air flotation (DAF) sludge using biochemical methane potential (BMP) tests. Bile was dosed at arbitrary concentrations from 0.2–6 g/L. At 0.6 g bile/L, methane yield increased by 7.08%. Doses above 2 g bile/L produced negative impacts on SMP, kinetics and digestion profile. At 6 g/L bile produced a 6% decrease in specific methane production and up to 79% additional inhibitory duration, delayed time of peak methane production by up to 74%, and slowed total digestion time by up to 65%. Reaction kinetics declined linearly with respect to bile addition, reaching half the control value at 6 g/L bile concentration. Subsequent anaerobic toxicity assays between 1 and 6 g bile/L revealed that bile has an inhibitory effect under BMP testing at these higher doses. The economic viability of using bile as a bio-surfactant was assessed. In comparison to the current use of bile as a sale product to pharmaceutical companies, the addition of 0.2 g bile/L to existing slaughterhouse waste streams could increase the value of bile to 220% of its current sale value. The promising results of bile dosed at 0.6 g/L under BMP testing warrant further investigation into long-term impact of bile pre-treatments of high-fat slaughterhouse wastewater in semi-continuous digestion experiments.

Keywordsbiochemical methane potential, abattoir, dissolved air flotation, anaerobic toxicity assay, reaction kinetics, inhibition
ANZSRC Field of Research 2020300299. Agriculture, land and farm management not elsewhere classified
Public Notes

Open Access.

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