Extraction of digestate from various raw materials and its mixtures with ash
2021
Dubrovskis, V., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Plume, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Adamovics, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
Within the framework of the LAD-29 project, it was necessary to obtain digestates from various raw materials used by the project partners and to test the possibility of granulating their mixture with ash. Raw materials were taken from the biogas plants of the project partners and analyzed in laboratory. Partner LatdanAgro feedstocks were charged in the same proportions, as in the biogas plant were filled, in two 110 liter bioreactors A and B, which operated in continuous operation mode. How much digestate can be obtained from each feedstock and how much of it can be obtained biogas was tested in 16 bioreactors in the batch mode. The operating temperature in all bioreactors was kept the same as in the bioreactors of the biogas plant. The digestates with different moisture contents obtained in the laboratory and also brought from four biogas plants were mixed with wood ash, the condition of each mixture was determined and the possibility of granulation was assessed. The granulation test revealed that when using a digestate with a high moisture content, it is cementing the added ash, but the ash, added to the dry digestate, puts in the air. Granules can only be formed, if the moisture content of the digestate is 20–30%. The thick fractions of digestates from the biogas plants of the four project partners, obtained from their fractionation plants, were tested. Different stability granules were made from them.
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