Evaluation of anaerobic digestion processes for short sludge-age waste activated sludge

Ge, H., Batstone, D. J. and Keller, J. (2013). Evaluation of anaerobic digestion processes for short sludge-age waste activated sludge. In: Juan M. Lema, Fernando Fdez-Polanco, Marta Carballa, Jorge Rodríguez and Sonia Suárez, Proceedings of 13th World Congress on Anaerobic Digestion: Recovering (bio) Resources for the World. 13th World Congress on Anaerobic Digestion (AD 13), Santiago de Compostela, Spain, (1-4). 25-28 June, 2013.

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Name Description MIMEType Size Downloads
Author Ge, H.
Batstone, D. J.
Keller, J.
Title of paper Evaluation of anaerobic digestion processes for short sludge-age waste activated sludge
Conference name 13th World Congress on Anaerobic Digestion (AD 13)
Conference location Santiago de Compostela, Spain
Conference dates 25-28 June, 2013
Proceedings title Proceedings of 13th World Congress on Anaerobic Digestion: Recovering (bio) Resources for the World
Place of Publication London, United Kingdom
Publisher International Water Association (IWA)
Publication Year 2013
Sub-type Fully published paper
Open Access Status
ISBN 9788469577561
Editor Juan M. Lema
Fernando Fdez-Polanco
Marta Carballa
Jorge Rodríguez
Sonia Suárez
Start page 1
End page 4
Total pages 4
Collection year 2014
Language eng
Formatted Abstract/Summary
It is well established that waste activated sludge (WAS) with an extended sludge age (normally > 10 days) has inherently poor degradability. The majority of previous research has focused on enhancing the degradability of long sludge-age WAS by using different anaerobic processes or by incorporating different pre-treatment methods prior to anaerobic digestion. However, there is very little information on the properties of short sludge-age WAS. In this paper, the anaerobic digestibility of WAS with an age of 2-4 days was evaluated under three different anaerobic processes, including single-stage mesophilic (37°C) and thermophilic (55°C) anaerobic digestion (AD) and temperature phased anaerobic digestion (2 days at 55°C, followed by 37°C). Degradability extent was strongly linked to sludge age being 85% (2 days), 73% (3 days), and 63% (4 days). Extent was not influenced by digestion temperature. Hydrolysis rates for the 2 day material were the same for thermophilic and mesophilic conditions. However, rate of degradation for 3 and 4 day material was strongly enhanced (by 45%) at thermophilic conditions. This indicates that longer sludge age material is more amendable to pre-treatment than short age material, but that under normal (non accumulation) conditions of 3 days or greater, there is a substantial kinetic advantage in operating at thermophilic conditions.
Keyword Anaerobic digestion
Waste activated sludge
Short sludge-age
Thermophilic
Mesophilic
Temperature phased anaerobic digestion
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Presented during the Session "Short-presentations: Solid waste treatment, co-digestion, new biomasses" as Paper SPC25. Published as Paper IWA-11954.

Document type: Conference Paper
Collections: Official 2014 Collection
Advanced Water Management Centre Publications
 
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Created: Fri, 08 Nov 2013, 16:04:14 EST by Jon Swabey on behalf of Advanced Water Management Centre