Anaerobic degradation of organic materials - significance of the substrate surface area

Palmowski, Laurence and Muller, J. 2003, Anaerobic degradation of organic materials - significance of the substrate surface area, Water science and technology, vol. 47, no. 12, pp. 231-238.

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Title Anaerobic degradation of organic materials - significance of the substrate surface area
Author(s) Palmowski, Laurence
Muller, J.
Journal name Water science and technology
Volume number 47
Issue number 12
Start page 231
End page 238
Publisher Pergamon
Place of publication Oxford, England
Publication date 2003
ISSN 0273-1223
Keyword(s) anaerobic digestion
biological degradation
mechanical pre-treatment
particulate organic substrate
specific surface area
Summary In anaerobic degradation of substrates containing mainly particulate organic matter, solids hydrolysis is rate-limiting. In these investigations, the particle size of various substrates was reduced by comminution to support hydrolysis. Two positive effects of comminution were observed. For substrates with high fibre content, which are particularly resistant to biodegradation, a significant improvement of the degradation degree was observed as a result of comminution. Secondly, for all substrates tested, and particularly for those rich in fibres, the degradation rate of comminuted samples was significantly higher. The first reason for both effects is an increase of the sample surface area. Several methods for measuring the specific surface area of organic materials, including particle size analysis, Nitrogen-adsorption and enzyme adsorption, were used and compared for the purpose of this study, where the surface area accessible to microbial enzymes is critical. The significance of the surface area in anaerobic degradation of particulate substrates was investigated through a kinetic model where the hydrolysis rate was based on the sample surface area. Good agreements were obtained between model and experiments carried out with samples of various specific surface areas. These results reinforced the significance of the sample surface area in anaerobic degradation processes. However, other effects of comminution responsible for the increased degradation degree and degradation rate were identified and discussed. These include: the increase of dissolved compounds due to cell rupture, exposition of surface areas previously inaccessible for microbial degradation, and alteration of the sample structure such as the lignin-cellulose arrangements.
Language eng
Field of Research 090703 Environmental Technologies
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2003, IWA Publishing
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