title: Fractal-like kinetics of the solid-state anaerobic digestion.
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.
authors.affiliation: Department of Civil and Environmental Engineering, Virginia Tech, Occoquan Laboratory, 9408 Prince William Street, Manassas, VA 20110, USA. Electronic address: wzw@vt.edu.
authors.forename: Zhi-Wu
authors.initials: ZW
authors.lastname: Wang
authors.affiliation: Department of Food, Agricultural and Biological Engineering, The Ohio State University/Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691, USA.
authors.forename: Fuqing
authors.initials: F
authors.lastname: Xu
authors.affiliation: Department of Civil and Environmental Engineering, Virginia Tech, Occoquan Laboratory, 9408 Prince William Street, Manassas, VA 20110, USA.
authors.forename: Karthik R
authors.initials: KR
authors.lastname: Manchala
authors.affiliation: Department of Civil and Environmental Engineering, Virginia Tech, Occoquan Laboratory, 9408 Prince William Street, Manassas, VA 20110, USA.
authors.forename: Yewei
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Department of Food, Agricultural and Biological Engineering, The Ohio State University/Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691, USA.
authors.forename: Yebo
authors.initials: Y
authors.lastname: Li
mesh_terms: D000693:Anaerobiosis; D017709:Fractals; D007700:Kinetics; D008962:Models, Theoretical; D012037:Refuse Disposal / Q000379:methods* / Q000706:statistics & numerical data
keywords: Crowding; Diffusion; Fractal dimension; Heterogeneous; Methane production efficiency