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Bioresour Technol. 2017 Nov;244(Pt 1):605-610. doi: 10.1016/j.biortech.2017.07.179. Epub 2017 Aug 3.

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

Author information

1
National Centre for Engineering in Agriculture, University of Southern Queensland, Toowoomba, QLD, Australia. Electronic address: Peter.Harris@usq.edu.au.
2
National Centre for Engineering in Agriculture, University of Southern Queensland, Toowoomba, QLD, Australia.

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.

KEYWORDS:

Abattoir; Alkali; Biogas; Biomethane potential; Dissolved air flotation sludge; Fat; Oil and grease

PMID:
28810214
DOI:
10.1016/j.biortech.2017.07.179
[Indexed for MEDLINE]
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