Co-digestion of cattle manure with paper dust briquettes
2025
Straume, Indulis | Dubrovskis, Vilis | Plume, Imants
In the world, around 26% of waste in landfills is paper waste. One way to recycle this kind of waste would be anaerobic digestion (AD) fermentation to produce biogas and methane. The aim of this research is to find specific volume of biogas and methane in anaerobic co-digestion of cattle manure with paper dust that was collected from a corrugated board production plant. Before anaerobic co-digestion (AD), the dry matter content and organic matter content of paper dust, cow manure and a mixture of both components were determined. The anaerobic digestion process for the cow manure - paper dust mixture was provided in three 4-section bioreactors with a working volume of 40 l per 4-section bioreactor. A mixture of cow manure and paper dust was added to the first section of the series-connected bioreactor sections, and digestate was removed from the fourth section during a 70-day anaerobic digestion process. Anaerobic digestion was provided at the mesophilic temperature of 38 °C, and the amount of paper dust in the input substrate was gradually increased from 50 grams to 180 grams. Organic load increased from 0.25 g·(dL)-1 to 2.9 g·(dL)-1. Biogas yield varied from 19.1 L·d-1 to 35 L·d-1 depending on the organic load. The maximum value of the specific yield of biogas is 0.428 L·gDOM-1. The concentration of methane in biogas started from 55%, and the maximum value – 60%, and the maximum specific methane yield was 0.254 L ·gDOM-1. The obtained maximum specific methane yield from co-digestion of cattle manure and paper dust was higher compared to previous studies where only paper dust was digested.
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Publisher Latvia University of Life Sciences and Technologies
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