Co-digestion of different waste mixtures from agro-industrial activities: Kinetic evaluation and synergetic effects
2011 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 102, no 23, 10834-10840 p.Article in journal (Refereed)
BACKGROUND: Several wastes from agro-industrial activities were mixed in different ratios to evaluate the co-digestion process. Methane yield (YCH4), specific methanogenic activity (SMA) and a kinetic parameter (k0) were determined. A second feeding was also performed to examine the recovery of bacterial activity after exhaustion.
Mixture ratios of 1:1:1:1 and 1:3:4:0.5 (w/w) showed the best performance, with YCH4 of 664; 582 NmL CH4/gVSsubstrate, as well as SMA of 0.12; 0.13 gCODNmLCH4/gVSinoculum/d, respectively, during the digestion of the first feed. It was possible to relate synergetic effects with enhancement in YCH4 by up to 43%, compared with values calculated from YCH4 of the individual substrates. All batches started up the biogas production after an exhaustion period, when a second feed was added. However, long lag phases (up to 21 days) were observed due to stressed conditions caused by the substrate limitation prior to the second feed.
Place, publisher, year, edition, pages
Elsevier BV , 2011. Vol. 102, no 23, 10834-10840 p.
agro-industrial waste streams, co-digestion, methane yield, specific methanogenic activity, kinetic evaluation
Energi och material
Engineering and Technology
Research subject Resource Recovery
IdentifiersURN: urn:nbn:se:hb:diva-3199DOI: 10.1016/j.biortech.2011.09.031Local ID: 2320/9535OAI: oai:DiVA.org:hb-3199DiVA: diva2:871296