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Stable operation during pilot-scale anaerobic digestion of nutrient-supplemented maize/sugar beet silage
Department of Biotechnology, Lund Univeristy.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Department of Biotechnology, Lund University.
2012 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 118, 445-454 p.Article in journal (Refereed) Published
Abstract [en]

Biogas production from maize/sugar beet silage was studied under mesophilic conditions in a continuous stirred tank reactor pilot-scale process. While energy crop mono-digestion is often performed with very long hydraulic retention times (HRTs), the present study demonstrated an efficient process operating with a 50-day HRT and a corrected total solids (TScorr) based organic loading rate of 3.4 kg/m3×d. The good performance was attributed to supplementation with both macro- and micronutrients and was evidenced by good methane yields (318 m3/ton TScorr) which were comparable to laboratory maximum expected yields plus low total volatile fatty acid concentrations (< 0.8 g/L). A viscoplastic and thixotropic digester fluid behaviour was observed, and the viscosity problems common in crop mono-digestion were not seen in this study. The effluent also complied with Swedish certification standards for bio-fertilizer for farmland application. Nutrient addition thus rendered a stable biogas process, while the effluent was a good quality bio-fertilizer.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 118, 445-454 p.
Keyword [en]
Bio-fertilizer, Biogas, Energy crops, Macronutrients, Micronutrients
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-81648DOI: 10.1016/j.biortech.2012.05.096ISI: 000307259600060OAI: diva2:555439
Available from: 2012-09-20 Created: 2012-09-20 Last updated: 2012-11-01

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Björn, Annika
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Department of Water and Environmental StudiesFaculty of Arts and Sciences
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