Optimization of biogas production from cattle manure by pre-treatment with ultrasound and co-digestion with crude glycerin |
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Authors: | Castrillón L Fernández-Nava Y Ormaechea P Marañón E |
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Institution: | Chemical Engineering and Environmental Technology Department, University Technology Institute of Asturias (IUTA), University of Oviedo, Campus of Gijón, 33203 Gijón, Spain |
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Abstract: | Biogas production by co-digestion of cattle manure with crude glycerin obtained from biodiesel production was studied after pre-treatment of the cattle manure or mixtures of cattle manure with different amounts of added glycerin with ultrasound. Batch experiments with 1750 mL of medium containing 1760 g of screened cattle manure or mixtures of cattle manure (screened or ground) and 70-140 mL or crude glycerin were incubated under mesophilic and thermophilic condition in stirred tank reactors. Under mesophilic conditions, the addition of 4% glycerin to screened manure increased biogas production by up to 400%. Application of sonication (20 kHz, 0.1 kW, and 4 min) to a mixture of manure + 4% glycerin increased production of biogas by up to 800% compared to untreated manure. The best results were obtained under thermophilic conditions using sonicated mixtures of ground cattle manure with 6% added glycerin (348 L methane/kg COD removed were obtained). |
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Keywords: | Cattle manure Crude glycerin Biogas Ultrasound Renewable energy |
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