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Biological treatment of chicken feather waste for improved biogas production
University of Borås, School of Engineering.
University of Borås, School of Engineering.
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2011 (English)In: Journal of Environmental Sciences(China), ISSN 1001-0742, E-ISSN 1878-7320, Vol. 23, no 10, p. 1747-1753Article in journal (Refereed) Published
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

A two-stage system was developed which combines the biological degradation of keratin-rich waste with the production of biogas. Chicken feather waste was treated biologically with a recombinant Bacillus megaterium strain showing keratinase activity prior to biogas production. Chopped, autoclaved chicken feathers (4%, W/V) were completely degraded, resulting in a yellowish fermentation broth with a level of 0.51 mg/mL soluble proteins after 8 days of cultivation of the recombinant strain. During the subsequent anaerobic batch digestion experiments, methane production of 0.35 Nm3/kg dry feathers (i.e., 0.4 Nm3/kg volatile solids of feathers), corresponding to 80% of the theoretical value on proteins, was achieved from the feather hydrolyzates, independently of the pre-hydrolysis time period of 1, 2 or 8 days. Cultivation with a native keratinase producing strain, Bacillus licheniformis resulted in only 0.25 mg/mL soluble proteins in the feather hydrolyzate, which then was digested achieving a maximum accumulated methane production of 0.31 Nm3/kg dry feathers. Feather hydrolyzates treated with the wild type B. megaterium produced 0.21 Nm3 CH4/kg dry feathers as maximum yield.

Place, publisher, year, edition, pages
Elsevier BV , 2011. Vol. 23, no 10, p. 1747-1753
Keywords [en]
anaerobic digestion, feather waste, keratinase, bacillus licheniformis, bacillus megaterium, gene expression
Keywords [sv]
Energi och material
National Category
Engineering and Technology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-3214DOI: 10.1016/S1001-0742(10)60648-1Local ID: 2320/9733OAI: oai:DiVA.org:hb-3214DiVA, id: diva2:871311
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-11-19Bibliographically approved

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Forgács, GergelyFeuk-Legerstedt, ElisabethSávári Horváth, Ilona

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Forgács, GergelyFeuk-Legerstedt, ElisabethSávári Horváth, Ilona
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