Cavitation for improved sludge conversion into biogas

In several studies the beneficial influence of pre-treatment of waste activated sludge with cavitation on the biogas production was demonstrated. It is however, still not fully certain whether this effect should be mainly contributed to an increase in conversion rate of organics into biogas by anaer...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 656; no. 1; pp. 12118 - 12121
Main Authors Stoop, A H, Bakker, T W, Kramer, H J M
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 03.12.2015
Subjects
Activated sludge
Biogas
Cavitation
Cell membranes
Conversion
Membrane structures
Organic chemistry
Physics
Sludge
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Summary:In several studies the beneficial influence of pre-treatment of waste activated sludge with cavitation on the biogas production was demonstrated. It is however, still not fully certain whether this effect should be mainly contributed to an increase in conversion rate of organics into biogas by anaerobic bacteria, and how much cavitation increases the total biogas yield. An increase in yield is only the case if cavitation can further disrupt otherwise inaccessible cell membrane structures and long chain organic molecules. In this study the influence of hydrodynamic cavitation on sludge that was already digested for 30 days was investigated. The total biogas yield could indeed be increased. The effect of the backpressure behind the venturi tube on the yield could not yet be established.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/656/1/012118