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Ramunas Mieldazys
Vytautas Magnus University, Lithuania

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Journal article
Published: 01 October 2020 in Sustainability
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The article analyses and evaluates the possibilities of using oak bark, oak leaves, and their mixtures for biofuel. The preparation of this waste for the burning process (milling, granulation) has been investigated and the results have been presented together with the analysis of the prepared granules’ properties—humidity, density, strength, elemental composition, ash content, caloric value, and others. The moisture content of the oak waste granules ranged from 8.1% to 12.5%, and the granules’ density ranged from 975.8 to 1122.2 kg m−3 DM (dry matter). The amount of oak ash found was very high (from 10.4% to 14.7%)—about 10 times higher than that of wood waste granules. The calorific value determined after burning the oak bark and leaves pellets was sufficiently high, ranging from 17.3 to 17.7 MJ kg−1. This thermal value of oak waste granules was close to the calorific value of the herbaceous plant species and some types of wood waste. The environmental impact of burning the granules of oak waste was also assessed. The harmful emissions of carbon monoxide and dioxide, nitrogen oxides, and unburnt hydrocarbons into the environment were found to be below the permissible limits for the incineration of oak waste granules. The highest CO gas concentration, determined when burning the oak leaves, was 1187.70 mg m−3, and the lowest NOx concentration, determined when burning the oak bark and leaf mixture granules, was 341.2 mg m−3. The coefficient of energy efficiency R of the granulated oak leaves biofuel, when the oak waste biomass moisture content was reduced by 10%, reached 3.64. It was very similar to the results of previous studies of various types of granulated straw biofuel (3.5–3.7). The research results presented show that, given that the main parameters of oak waste meet the basic requirements of solid biofuel, oak bark, leaves, and their mixture can be recommended to be used as solid biofuels.

ACS Style

Algirdas Jasinskas; Ramūnas Mieldažys; Eglė Jotautienė; Rolandas Domeika; Edvardas Vaiciukevičius; Marek Marks. Technical, Environmental, and Qualitative Assessment of the Oak Waste Processing and Its Usage for Energy Conversion. Sustainability 2020, 12, 8113 .

AMA Style

Algirdas Jasinskas, Ramūnas Mieldažys, Eglė Jotautienė, Rolandas Domeika, Edvardas Vaiciukevičius, Marek Marks. Technical, Environmental, and Qualitative Assessment of the Oak Waste Processing and Its Usage for Energy Conversion. Sustainability. 2020; 12 (19):8113.

Chicago/Turabian Style

Algirdas Jasinskas; Ramūnas Mieldažys; Eglė Jotautienė; Rolandas Domeika; Edvardas Vaiciukevičius; Marek Marks. 2020. "Technical, Environmental, and Qualitative Assessment of the Oak Waste Processing and Its Usage for Energy Conversion." Sustainability 12, no. 19: 8113.

Conference paper
Published: 20 May 2020 in 20th International Scientific Conference Engineering for Rural Development Proceedings
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ACS Style

Ramunas Mieldazys; Egle Jotautiene; Algirdas Jasinskas. Physical mechanical properties evaluation of experimental granulated poultry manure fertilizer. 20th International Scientific Conference Engineering for Rural Development Proceedings 2020, 1 .

AMA Style

Ramunas Mieldazys, Egle Jotautiene, Algirdas Jasinskas. Physical mechanical properties evaluation of experimental granulated poultry manure fertilizer. 20th International Scientific Conference Engineering for Rural Development Proceedings. 2020; ():1.

Chicago/Turabian Style

Ramunas Mieldazys; Egle Jotautiene; Algirdas Jasinskas. 2020. "Physical mechanical properties evaluation of experimental granulated poultry manure fertilizer." 20th International Scientific Conference Engineering for Rural Development Proceedings , no. : 1.

Conference paper
Published: 20 May 2020 in 20th International Scientific Conference Engineering for Rural Development Proceedings
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ACS Style

Algirdas Jasinskas; Justinas Skruodys; Rolandas Domeika; Ramunas Mieldazys; Nerijus Pedisius. Investigation of physical-mechanical and energy properties of granulated cereal plant waste and ash obtained by incineration of produced biofuel. 20th International Scientific Conference Engineering for Rural Development Proceedings 2020, 1 .

AMA Style

Algirdas Jasinskas, Justinas Skruodys, Rolandas Domeika, Ramunas Mieldazys, Nerijus Pedisius. Investigation of physical-mechanical and energy properties of granulated cereal plant waste and ash obtained by incineration of produced biofuel. 20th International Scientific Conference Engineering for Rural Development Proceedings. 2020; ():1.

Chicago/Turabian Style

Algirdas Jasinskas; Justinas Skruodys; Rolandas Domeika; Ramunas Mieldazys; Nerijus Pedisius. 2020. "Investigation of physical-mechanical and energy properties of granulated cereal plant waste and ash obtained by incineration of produced biofuel." 20th International Scientific Conference Engineering for Rural Development Proceedings , no. : 1.

Conference paper
Published: 20 May 2020 in 20th International Scientific Conference Engineering for Rural Development Proceedings
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ACS Style

Egle Jotautiene; Ramunas Mieldazys; Aloyzas Gaudutis; Aivars Aboltins. Granulation of poultry manure and biochar for production of organic fertilizers. 20th International Scientific Conference Engineering for Rural Development Proceedings 2020, 1 .

AMA Style

Egle Jotautiene, Ramunas Mieldazys, Aloyzas Gaudutis, Aivars Aboltins. Granulation of poultry manure and biochar for production of organic fertilizers. 20th International Scientific Conference Engineering for Rural Development Proceedings. 2020; ():1.

Chicago/Turabian Style

Egle Jotautiene; Ramunas Mieldazys; Aloyzas Gaudutis; Aivars Aboltins. 2020. "Granulation of poultry manure and biochar for production of organic fertilizers." 20th International Scientific Conference Engineering for Rural Development Proceedings , no. : 1.

Journal article
Published: 18 August 2019 in Sustainability
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A need for the disposal of poultry manure and the reduction of its impact on the environment encourages the search for cleaner and more efficient ways to utilize and recycle production waste. It is known that granulated ash and manure are the most effective alternatives for ash and manure recycling, as compared to the unprocessed product. This paper presents an investigation of ash and poultry manure recycling for granulated fertilizers. Accepted standard experimental methods were used. The physical and mechanical characteristics of the granules, elemental composition ratio, and the process of compression of the raw material mill were determined experimentally. This research shows that, when a higher ash concentration was determined, the initial bulk density was larger and the density and pressure in the granulation process increases faster. The content of ash in the raw material increased granule strength; however, when increasing the ash mass in the raw material from 25% to 50%, energy consumption increased from 6.59 kJ·kg−1 to 17.72 kJ·kg−1. The process of compression of the raw material mill was obtained in two stages. In the first stage of compression, the mass density varied from 3–11 kg·m−3 and the pressure varied from 1.25–8.27 MPa. In the second pressure stage, the mass deformation was elastic and the pressure process was described by indicator functions.

ACS Style

Ramūnas Mieldažys; Eglė Jotautienė; Algirdas Jasinskas. The Opportunities of Sustainable Biomass Ashes and Poultry Manure Recycling for Granulated Fertilizers. Sustainability 2019, 11, 4466 .

AMA Style

Ramūnas Mieldažys, Eglė Jotautienė, Algirdas Jasinskas. The Opportunities of Sustainable Biomass Ashes and Poultry Manure Recycling for Granulated Fertilizers. Sustainability. 2019; 11 (16):4466.

Chicago/Turabian Style

Ramūnas Mieldažys; Eglė Jotautienė; Algirdas Jasinskas. 2019. "The Opportunities of Sustainable Biomass Ashes and Poultry Manure Recycling for Granulated Fertilizers." Sustainability 11, no. 16: 4466.