Biogas production from paper dust briquettes
2020
Straume, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia);University of Latvia, Riga (Latvia). Inst. of Mathematics and Computer Science | Dubrovskis, V., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
As global warming is now undergoing major climate change, the need to reduce greenhouse gases has become more acute. Many processing industries have energy that we do not even think about on a daily basis. Residues of materials that are produced in many factories from technological processes are difficult for utilization. This is the case, for example, in the manufacture of corrugated cardboard, paper dust that accumulates in air filters. This type of waste, which is mechanically separated in technological processes in Latvia, accumulates about 250 tons per year. The company presses it into briquettes and burns. Incineration generates additional emissions. It would be more environmentally friendly to recycle such waste through anaerobic fermentation. The aim of the study was to determine the potential of biogas from paper dust briquettes in anaerobic fermentation. The study was conducted in four four-section bioreactors with a capacity of 40 litres. Anaerobic fermentation took place in mesophilic mode at 38 ºC. The study lasted for 100 days, during which the following results were obtained. The biogas yield was on average 25.24 L•dE−1 and the methane yield 12.3 L•dE−1. The yield of biogas per gram of dry organic matter was on average 0.335 L•gDOME−1, and the yield of methane was 0.163 L•gDOME−1 at 48.7 % methane content. The novelty of the research was the use of paper dust briquettes and four-section bioreactors in anaerobic fermentation. The results are original. The results by sections are as follows: section 1 averaged 5.59 L•dE−1, section 2–4.83 L•dE−1, section 3–5.54 L•dE−1, section 4–9.29 L•dE−1. The study shows that paper dust briquettes are also well used for biogas production.
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