Methane Potential of Waste Activated Sludge and Fatty Residues: Impact of Codigestion and Alkaline Pretreatments

The aim of this study was to maximise methane production from waste activated sludge (WAS) originating from extended aeration process and presenting a low methane potential (190 mL CH sub(4.g[super]-1 OM). WAS co-digestion with fatty residues (FR, 560 mL CH) sub(4).g[super]-1 OM) produced during pre...

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Bibliographic Details
Published in:The open environmental engineering journal 2010-01, Vol.3 (1), p.71-76
Main Authors: Carrerea, Helene, Rafrafi, Yan, Battimelli, Audrey, Torrijos, Michel, Delgenes, Jean-Philippe, Ruysschaert, Gilles
Format: Article
Language:English
Subjects:
Environmental Sciences
Life Sciences
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Summary:The aim of this study was to maximise methane production from waste activated sludge (WAS) originating from extended aeration process and presenting a low methane potential (190 mL CH sub(4.g[super]-1 OM). WAS co-digestion with fatty residues (FR, 560 mL CH) sub(4).g[super]-1 OM) produced during pretreatments of the effluents from wastewater treatment plants in the Lille area and fatty wastewaters (FW, around 700 mL CH sub(4.g[super]-1 OM) collected from restaurants was assessed by batch experiments. Moreover saponification/alkali pretreatments improved kinetics of anaerobic digestion but had a low impact on methane potential (+ 6-7%) of the mixed waste composed of 66.6% of FW, 33.3% of WAS and 0.1% of FR. As results did not depend on pH ranging from 8 to 10 (addition of 0.12 to 0.21 g) sub(K)OH g sub(OM[super]-1 ) nor temperature ranging from 80 to 120 C, the least severe studied pretreatment conditions (80C and pH=8) may be selected for further studies on continuous anaerobic reactors.)
ISSN:1874-8295
1874-8295
DOI:10.2174/1874829501003010071