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  • Title: Methane production in a 100-L upflow bioreactor by anaerobic digestion of farm waste.
    Author: Borole AP, Klasson KT, Ridenour W, Holland J, Karim K, Al-Dahhan MH.
    Journal: Appl Biochem Biotechnol; 2006; 129-132():887-96. PubMed ID: 16915697.
    Abstract:
    Manure waste from dairy farms has been used for methane production for decades, however, problems such as digester failure are routine. The problem has been investigated in small scale (1-2 L) digesters in the laboratory; however, very little scale-up to intermediate scales are available. We report production of methane in a 100-L digester and the results of an investigation into the effect of partial mixing induced by gas upflow/recirculation in the digester. The digester was operated for a period of about 70 d (with 16-d hydraulic retention time) with and without the mixing induced by gas recirculation through an internal draft tube. The results show a clear effect of mixing on digester operation. Without any mixing, the digester performance deteriorated within 30-50 d, whereas with mixing continuous production of methane was observed. This study demonstrates the importance of mixing and its critical role in design of large scale anaerobic digesters.
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