Title: Comparing the influence of low power ultrasonic and microwave pre-treatments on the solubilisation and semi-continuous anaerobic digestion of waste activated sludge
Authors: Houtmeyers, Sofie
Degrève, Jan
Willems, Kris
Dewil, Raf
Appels, Lise # ×
Issue Date: Nov-2014
Publisher: Elsevier Applied Science
Series Title: Bioresource Technology vol:171 pages:44-49
Abstract: Anaerobic digestion is a well-known technique for the recovery of energy from waste sludge. Pre-treatment methods are useful tools to improve the biodegradability of the sludge and to enhance the digestion efficiency. In this study, an ultrasound (US) and a microwave (MW) pre-treatment were compared in a long-term digestion experiment, using 3 small pilot scale semi-continuous digesters (SRT=20days). A specific energy of 96kJ/kg sludge was applied, hence enabling to compare the effectiveness of both pre-treatment methods towards sludge solubilisation and biogas production enhancement. Total and volatile solids (TS and VS), COD, carbohydrates and proteins were monitored throughout the digestion experiment. It was seen that US was most effective in COD solubilisation. The average biogas increment was 20% for the microwave pre-treatment and 27% for the ultrasonic pre-treatment. However, this additional biogas production did not outweigh the energy consumed by the pre-treatment, leading to a negative energy balance.
ISSN: 0960-8524
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Sustainable Chemical Process Technology TC, Technology Campus De Nayer Sint-Katelijne-Waver
Sustainable Chemical Process Technology TC
Bio- & Chemical Systems Technology, Reactor Engineering and Safety Section
Bioengineering Technology TC, Technology Campus De Nayer Sint-Katelijne-Waver
Technologiecluster Bioengineering Technologie
Department of Health and Technology - UC Leuven
× corresponding author
# (joint) last author

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