Stable operation during pilot-scale anaerobic digestion of nutrient-supplemented maize/sugar beet silage.

Research output: Contribution to journalArticle

Abstract

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 (TS(corr)) based organic loading rate of 3.4kg/m(3)d. The good performance was attributed to supplementation with both macro- and micronutrients and was evidenced by good methane yields (318m(3)/tonTS(corr)), which were comparable to laboratory maximum expected yields, plus low total volatile fatty acid concentrations (<0.8g/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.

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Subject classification (UKÄ) – MANDATORY

  • Industrial Biotechnology

Keywords

  • Biogas, Bio-fertilizer, Energy crops, Macronutrients, Micronutrients
Original languageEnglish
Pages (from-to)445-454
JournalBioresource Technology
Volume118C
Publication statusPublished - 2012
Publication categoryResearch
Peer-reviewedYes