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Institutional Repository [SANDBOX]
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/2229D8F1-5CC4-4C07-84DD-C30D1C9683DD | ||
| Year | 2022 | ||
| Type of Item | Master Thesis | ||
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| Bibliographic Citation | Katerina Esser, "Pyrolysis of agricultural and industrial wastes and exploitation of products for energy production and soil amendment", Master Thesis, School of Mineral Resources Engineering, Technical University of Crete, Chania, Greece, 2022 https://doi.org/10.26233/heallink.tuc.91895 | ||
| Appears in Collections |
The aim of this study was to investigate whether pyrolysis products from agricultural, forest and industrial wastes could be exploited for energy production or for soil amendment. Materials selected on the basis of their abundance in Greece and Mediterranean countries were cotton residues, grape husks, sunflower, pine needles, as well as industrial wood wastes and municipal wastes. The samples were pyrolyzed in a fixed bed reactor at temperatures 350-550°C and biochars, bio-oils and gases were physochemically and chemically analyzed. An increase in pyrolysis temperature decreased the yield of biochar, which was enriched in carbon and ash. Biochars of grape husks, cotton residues and sewage sludge had a high concentration in nutrients and could be possibly used for soil amelioration, while sunflower, pine needles, cotton residues and sawdust biochars, having a high content in organic matter and low in ash, sulfur and nitrogen, could be used for energy production through combustion or gasification processes. The calorific value of bio-oils was quite high 20-28 MJ/kg, while that of pyrolysis gases of 350°C was about 6-12 MJ/m3. At low temperatures evolved gases were mainly carbon oxides.
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