Pilot study on ultrasonic pre-treatment of waste activated sludge anaerobic digestion for improved energy recovery

Andriany, S., Simpson, G., Batstone, D. J. and Jensen, P. D. (2012). Pilot study on ultrasonic pre-treatment of waste activated sludge anaerobic digestion for improved energy recovery. In: Bianca Di Salvo, AWA Biosolids and Source Management National Conference: Program and Abstracts. AWA Biosolids and Source Management National Conference, Gold Coast, Qld., Australia, (74-74). 18-20 June 2012.

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Name Description MIMEType Size Downloads
Author Andriany, S.
Simpson, G.
Batstone, D. J.
Jensen, P. D.
Title of paper Pilot study on ultrasonic pre-treatment of waste activated sludge anaerobic digestion for improved energy recovery
Conference name AWA Biosolids and Source Management National Conference
Conference location Gold Coast, Qld., Australia
Conference dates 18-20 June 2012
Proceedings title AWA Biosolids and Source Management National Conference: Program and Abstracts
Place of Publication St Leonards, NSW, Australia
Publisher Australian Water Association
Publication Year 2012
Sub-type Published abstract
ISBN 9781921335204
Editor Bianca Di Salvo
Start page 74
End page 74
Total pages 1
Collection year 2013
Language eng
Abstract/Summary Sonication is an emerging method to enhance performance of waste activated sludge. While shown to cause substantial enhancements in the laboratory, mainly due to an increase in rate, there is little information in full-scale, particularly parallel studies where two reactors are operated in parallel, one receiving sonicated sludge, the other not. In addition, full-scale operation is generally at lower sonication energy inputs (<5 kWh/m3 of Thickened Waste Activated Sludge/TWAS fraction) compared with laboratory studies. In this work, one of the Luggage Point digesters was fed with sonicated TWAS (22% of TWAS or 12% of total feed to digester) with the remainder being primary sludge. A control reactor was simultaneously operated in the same way except that the 12% stream was not sonicated. The results showed that the sonicated reactor performed identically in terms of VS destruction (mass balance and van Kleeck), and gas production per unit VS fed. Further analysis using biochemical methane potential tests demonstrated no significant impact of sonication at 4.3 kWh/m3, 8.0 kWh/m3, or 13.0 kWh/m3 on TWAS. Blends of TWAS, sonicated TWAS, and primary sludge were likewise unaffected (only the TWAS fraction was sonicated). Sonication did induce a significant and substantial change in size distribution in TWAS, reducing the median size by 20%-30% (by between 20 and 80μm), mainly by breaking larger particles into smaller particles. This also induced a small but measurable change in the final digester effluent size distribution over the course of the study. The results indicate that this technology is highly application specific, and that at least laboratory tests on actual material, and preferably full-scale trials are required to guide an informed decision.
Q-Index Code EX
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Conference theme "Source to Resource: The Input Influences The End Use". Abstract number: 54

 
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Created: Fri, 03 Aug 2012, 14:13:30 EST by Dr Damien Batstone on behalf of School of Chemical Engineering