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Enhancement of solubilization rate of cellulose in anaerobic digestion and its drawbacks, Process
University of Borås, School of Engineering. (Swedish Centre for Resource Recovery)ORCID iD: 0000-0003-4887-2433
2011 (English)In: Process Biochemistry, ISSN 1359-5113, E-ISSN 1873-3298, Vol. 46, no 7, 1509-1514 p.Article in journal (Refereed) Published
Abstract [en]

Hydrolysis is widely acknowledged as the rate-limiting step in anaerobic digestion of solid cellulose to biogas (methane), and pretreatment is generally considered to facilitate the process. However, few studies have investigated how such pretreatment may affect the rest of this complex process. The present study compared the solubilization rate in anaerobic digestion of cotton linter (high crystalline cellulose), with that of regenerated cellulose (amorphous cellulose), using pretreatment with NMMO. Batch digestions were performed, with the initial cellulose concentrations ranging between 5 and 40 g/l, and during 30 days of incubation, biogas and VFAs production as well as pH and COD changes were measured. The lag time before digestion started was longer for the high crystalline cellulose than for the amorphous one. The maximum solubilization rates of treated cellulose were 842 and 517 mg sCOD/g cCOD/day at the initial cellulose concentration of 5 and 30 g/l, respectively, while the solubilization rate of untreated cellulose never exceeded 417 mg sCOD/g cCOD/day. The difference between the two cellulose types was a direct result of the high rate of hydrolysis inhibiting the acetogenesis/methanogenesis microorganisms, a drawback to the rest of the process.

Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 46, no 7, 1509-1514 p.
Keyword [en]
Biotechnology
National Category
Chemical Engineering Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-3184DOI: 10.1016/j.procbio.2011.04.003Local ID: 2320/9429OAI: oai:DiVA.org:hb-3184DiVA: diva2:871281
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2016-09-28Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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