Title: Comparing the influence of ultrasonic and microwave pre-treatment on the solubilisation and semi-continuous digestion of waste activated sludge
Authors: Houtmeyers, Sofie
Appels, Lise
Degrève, Jan
Van Impe, Jan
Dewil, Raf
Issue Date: 2013
Publisher: International Water Association
Host Document: Proceedings of 13th World Congress on Anaerobic Digestion pages:1-4
Conference: World Congress on Anaerobic Digestion edition:13 location:Santiago de Compostela, Spain date:25-28 June 2013
Abstract: Anaerobic digestion is a well-known technique for the recovery of energy from waste activated sludge. To increase the biodegradability of the sludge and to enhance the digestion efficiency, pretreatment methods are of great importance. In this study, ultrasound and microwave pre-treatment were compared, through the use of three pilot scale semi-continuous digesters with a solids retention time of 20 days. During the experiment, one reactor was fed with untreated sludge (blank), one with ultrasound pre-treated sludge and one with microwave pre-treated sludge (both treated with a specific energy of 2100 kJ/kg sludge). (Organic) dry matter, COD, carbohydrates and proteins were analysed during digestion. The solubilisation of the organic material was the most effective by the ultrasound pre-treatment. The biogas production, which is the result of a change in sludge composition, is the highest in the microwave pre-treated digester. This results in an increased biogas production of 27% (i.e. 0.105 L/g ODS, blank 0.085 L/g ODS), compared to a 23% (i.e. 0.108 L/g ODS) increase by the ultrasound pre-treated digester. From the energy balance it is clear that both pre-treatments are economically not feasible.

Keywords Anaerobic digestion, waste activated sludge, pre-treatment, ultrasound, microwave, semi-pilot scale
ISBN: 978-84-695-7756-1
Publication status: published
KU Leuven publication type: IC
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
Department of Health and Technology - UC Leuven

Files in This Item:
File Description Status SizeFormat
AD13_S.Houtmeyers_final.pdf Published 258KbAdobe PDFView/Open


All items in Lirias are protected by copyright, with all rights reserved.