Effects of thermobarical pretreatment of cattle waste as feedstock for anaerobic digestion |
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Authors: | Jörn Budde Monika Heiermann Teresa Suárez Quiñones Matthias Plöchl |
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Institution: | Leibniz-Institute for Agricultural Engineering Potsdam-Bornim, Max-Eyth-Allee 100, 14469 Potsdam, Germany |
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Abstract: | Lab-scale experiments were conducted to assess the impact of thermobarical treatment of cattle waste on anaerobic digestion. Treatment was at temperatures of 140–220 °C in 20 K steps for a 5-min duration. Methane yields could be increased by up to 58% at a treatment temperature of 180 °C. At 220 °C the abundance of inhibitors and other non-digestible substances led to lower methane yields than those obtained from untreated material. In an extended analysis it could be demonstrated that there is a functional correlation between the methane yields after 30 days and the formation rate and methane yield in the acceleration phase. It could be proved in a regression of these correlation values that the optimum treatment temperature is 164 °C and that the minimum treatment temperature should be above 115 °C. |
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Keywords: | LHW Hydrolysis Methane yield Inhibitors Mathematical analysis |
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