Co-digestion of sewage sludge and sterilized solid slaughterhouse waste: methane production efficiency and process inhibition
Author(s)
Pitk, P
Kaparaju, P
Palatsi, J
Affes, R
Vilu, R
Griffith University Author(s)
Year published
2013
Metadata
Show full item recordAbstract
The rendering product of Category 2 and 3 Animal By-Products is known as sterilized mass (SM) and it is mainly composed of fat and proteins, making it interesting substrate for anaerobic digestion. Batch and semi-continuous laboratory experiments were carried out to investigate the effect of SM addition in co-digestion with sewage sludge on methane production and possible process limitations. Results showed that SM addition in the feed mixture up to 5% (w/w), corresponding to 68.1% of the organic loading, increased methane production 5.7 times, without any indication of process inhibition. Further increase of SM addition at ...
View more >The rendering product of Category 2 and 3 Animal By-Products is known as sterilized mass (SM) and it is mainly composed of fat and proteins, making it interesting substrate for anaerobic digestion. Batch and semi-continuous laboratory experiments were carried out to investigate the effect of SM addition in co-digestion with sewage sludge on methane production and possible process limitations. Results showed that SM addition in the feed mixture up to 5% (w/w), corresponding to 68.1% of the organic loading, increased methane production 5.7 times, without any indication of process inhibition. Further increase of SM addition at 7.5% (w/w) caused methane production decrease and volatile solids removal reduction, that was mainly related to remarkably increased free ammonia concentration in the digester of 596.5 ± 68.6 gNH3 L−1. Sterilized mass addition of 10% (w/w) caused intensive foaming, LCFA accumulation of 9172 ± 701.2 mgCOD-LCFA g−1sample and termination of the experiment.
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View more >The rendering product of Category 2 and 3 Animal By-Products is known as sterilized mass (SM) and it is mainly composed of fat and proteins, making it interesting substrate for anaerobic digestion. Batch and semi-continuous laboratory experiments were carried out to investigate the effect of SM addition in co-digestion with sewage sludge on methane production and possible process limitations. Results showed that SM addition in the feed mixture up to 5% (w/w), corresponding to 68.1% of the organic loading, increased methane production 5.7 times, without any indication of process inhibition. Further increase of SM addition at 7.5% (w/w) caused methane production decrease and volatile solids removal reduction, that was mainly related to remarkably increased free ammonia concentration in the digester of 596.5 ± 68.6 gNH3 L−1. Sterilized mass addition of 10% (w/w) caused intensive foaming, LCFA accumulation of 9172 ± 701.2 mgCOD-LCFA g−1sample and termination of the experiment.
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Journal Title
Bioresource Technology
Volume
134
Subject
Environmental engineering not elsewhere classified