Methane production in a 100-L upflow bioreactor by anaerobic digestion of farm waste |
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Authors: | Abhijeet P Borole K Thomas Klasson Whitney Ridenour Justin Holland Khursheed Karim and Muthanna H Al-Dahhan |
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Institution: | (1) Oak Ridge National Laboratory, 37831-6226 Oak Ridge, TN;(2) Southern Regional Research Center, USDA-ARS, 1100 Robert E. Lee Blvd, 70124 New Orleans, LA;(3) Oak Ridge Institute for Science and Education, ORAU, 37830 Oak Ridge, TN;(4) Chemical Reaction Engineering Laboratory (CREL), Department of Chemical Engineering, Washington University, 63130 St. Louis, MO |
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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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Keywords: | Anaerobic digestion animal manure gas recirculation mixing biogas |
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