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Updated: Mar 21, 2026

Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
Fractal-like kinetics of the solid-state anaerobic digestion
Zhi-Wu Wang1, Fuqing Xu2, Karthik R Manchala1
1Department of Civil and Environmental Engineering, Virginia Tech, Occoquan Laboratory, 9408 Prince William Street, Manassas, VA 20110, USA.
Abstract:
Total solid content (TS) negatively impacts the methane production efficiency (MPE) of solid-state anaerobic digestion (SS-AD), to which the classic mass action-based kinetics failed to provide a unified explanation. This study revealed that SS-AD reactions actually follow the fractal-like kinetics in light of the surface reactions in crowded SS-AD environment packed with heterogeneous media. The fractal characteristics of the SS-AD kinetics were found increasingly pronounced as TS increased. This study represents the first attempt to resolve the dilemma in SS-AD kinetics with the application of fractal theory. Employing this new concept allows explaining the reduced MPE at high TS and offers an easy assessment of the fractal characteristics of the SS-AD media.
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