Anaerobic digestion of slaughterhouse waste in batch and anaerobic sequential batch reactors.
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2022
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Biomass Conversion and Biorefinery
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Abstract
This work focuses on the design of an effective treatment process for slaughterhouse waste management. Four different
treatment sequences were proposed, based on aerobic and anaerobic technologies, as well as thermal and centrifugation
pre-treatments. Biochemical methane potential tests were carried out to assess the viability in terms of biodegradability and
biogas production of the anaerobic digestion units, which involved different substrates for each proposed process (raw slaughterhouse
wastewater, thermal pre-treated slaughterhouse activated sludge, supernatant of thermal pre-treated slaughterhouse
sludge, and co-digestion mixture of slaughterhouse wastewater and supernatant of thermal pre-treated slaughterhouse sludge).
The obtained results showed that thermal pre-treatment is not effective by itself. However, if it is followed by centrifugation,
organic matter removal is importantly improved. In addition, removal efficiency reached 76.0% when employing a codigestion
mixture. Kinetic analyses showed that the specific constant rate of the mixture was 1.5 times higher than with the
sole supernatant. Afterwards, the co-digestion mixture was employed as a substrate for an anaerobic sequencing batch reactor
working under a semi-continuous operational mode. The influence of organic load rate (OLR) on organic matter removal and
biogas production was studied. The best operational OLR range was 1.16–2.16 kg/m3•d, achieving 87.8% of chemical oxygen
demand removal and 0.23 LCH4/
Ldigester·d of methane production rate. A faster organic load rate than 2.88 kg/m3•d led to
bioreactor destabilisation. The obtained results were competitive against published studies that employed different anaerobic
technologies and made progress towards the industrial implementation of effective technology in slaughterhouse facilities.
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Keywords
Anaerobic co-digestion, Slaughterhouse wastewater, Supernatant activated sludge, Kinetic modelling, Anaerobic sequential batch reactor