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POSSIBILITIES OF ENERGETIC USE OF SELECTED AGRICULTURAL WASTES BY THERMAL REDUCTION PROCESSES
Abstract
The product of biogas plants, in addition to em erging biogas as well as digestate, which is usually used for fertilization. Due to the relatively strict legislative requirements, which must meet the digestate to be used fo r fertilization, it is necessary to design and evaluate other potential alte rnative use of digestate. This paper presents the initial laboratory experiments of pyrolysis and gasifi cation of dried digestates, focusing on the composition of gaseous products of these pr ocesses, utilization of solid and liquid residues, material balance and process energy. Gas from the pyrolysis and gasification experiments were captured discontinuously at different process temp eratures in glass sample bottles and the selected component s (methane, ethene, propane, hydrogen, carbon monoxide, carbon dioxide) were analyzed by gas chromatography. Hydrogen concentrations ranged from 20-40 vol. % afte r pyrolysis experiments and to 10 vol. % after gasification. The resulting iodine numbers of carbonized digestates reached values that indicate a possibility of their use in the production of "disposable sorbents" for wastewater treatment.
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