Bovine bile as a bio-surfactant pre-treatment option for anaerobic digestion of high-fat cattle slaughterhouse waste
Article
Article Title | Bovine bile as a bio-surfactant pre-treatment option for anaerobic digestion of high-fat cattle slaughterhouse waste |
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ERA Journal ID | 200987 |
Article Category | Article |
Authors | Harris, Peter W. (Author), Schmidt, Thomas (Author) and McCabe, Bernadette K. (Author) |
Journal Title | Journal of Environmental Chemical Engineering |
Journal Citation | 6 (1), pp. 444-450 |
Number of Pages | 7 |
Year | 2018 |
Place of Publication | Netherlands |
ISSN | 2213-3437 |
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. |
Keywords | biochemical methane potential, abattoir, dissolved air flotation, anaerobic toxicity assay, reaction kinetics, inhibition |
ANZSRC Field of Research 2020 | 300299. Agriculture, land and farm management not elsewhere classified |
Public Notes | Open Access. |
Byline Affiliations | National Centre for Engineering in Agriculture |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4864/bovine-bile-as-a-bio-surfactant-pre-treatment-option-for-anaerobic-digestion-of-high-fat-cattle-slaughterhouse-waste
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