Granular Sludge Bed Processes in Anaerobic Digestion of Particle-Rich Substrates

Fasil Ayelegn Tassew, Wenche Hennie Bergland, Carlos Dinamarca, Roald Kommedal and Rune Bakke
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Fasil Ayelegn Tassew: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Kjølnes ring 56, 3918 Porsgrunn, Norway
Wenche Hennie Bergland: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Kjølnes ring 56, 3918 Porsgrunn, Norway
Carlos Dinamarca: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Kjølnes ring 56, 3918 Porsgrunn, Norway
Roald Kommedal: Institute of Chemistry, Biosciences and Environmental Engineering Stavanger, University of Stavanger, 4021 Stavanger, Norway
Rune Bakke: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Kjølnes ring 56, 3918 Porsgrunn, Norway

Energies, 2019, vol. 12, issue 15, 1-20

Abstract: Granular sludge bed (GSB) anaerobic digestion (AD) is a well-established method for efficient wastewater treatment, limited, however, by the wastewater particle content. This review is carried out to investigate how and to what extent feed particles influence GSB to evaluate the applicability of GSB to various types of slurries that are abundantly available. Sludge bed microorganisms evidently have mechanisms to retain feed particles for digestion. Disintegration and hydrolysis of such particulates are often the rate-limiting steps in AD. GSB running on particle-rich substrates and factors that affect these processes are stdied especially. Disintegration and hydrolysis models are therefore reviewed. How particles may influence other key processes within GSB is also discussed. Based on this, limitations and strategies for effective digestion of particle-rich substrates in high-rate AD reactors are evaluated.

Keywords: high-rate anaerobic digestion; granular sludge; disintegration; hydrolysis; suspended solids; particulates (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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