Journal of Engineering Sciences / Журнал інженерних наук
Permanent URI for this collectionhttps://devessuir.sumdu.edu.ua/handle/123456789/34326
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Item Digestate potential to substitute mineral fertilizers: Engineering approaches(Sumy State University, 2022) Аблєєва, Ірина Юріївна; Аблеева, Ирина Юрьевна; Ablieieva, Iryna Yuriivna; Geletukha, G.G.; Kucheruk, P.P.; Enrich-Prast, A.; Carraro, G.; Бережна, Ірина Олексіївна; Бережная, Ирина Алексеевна; Berezhna, Iryna Oleksiivna; Бережний, Дмитрій Михайлович; Бережной, Дмитрий Михайлович; Berezhnyi, Dmytrii MykhailovychThe study aims to define the potential and technological aspects of the digestate treatment for its application as a biofertilizer. Life cycle assessment methodology was used in terms of digestate quality management. The potential of nutrients, organic carbon, and useful microelements in the digestate allows for its consideration as a mineral fertilizer substitute and soil improver. The valorization of digestate as fertilizer requires quality management and quality control. Based on the research focus, the successful soil application of digestate post-treatment technologies was analyzed. Among the different commercial options for digestate treatment and nutrient recovery, the most relevant are drying, struvite precipitation, stripping, evaporation, and membranes technology. Comparing the physical and chemical properties of the whole digestate, separated liquid, and solid liquor fractions showed that in the case of soil application of granular fertilizer, nutrients from the digestate are released more slowly than digestate application without granulation. However, realizing this potential in an economically feasible way requires improving the quality of digestate products through appropriate technologies and quality control of digestate products. To support the manufacture of quality digestate across Europe, the European Compost Network developed a concept for a panEuropean quality assurance scheme.Item Low-carbon City Inventory Method for the Local Scale(Sumy State University, 2020) Osman, T.Greenhouse gas (GHG) inventory has played a fundamental role in providing scientific political-making evidence in mitigation. For a particular case study, Japan offers a positive performance in reducing GHG emissions since an early age, and the GHG Inventory Office of Japan was established in 2002 and is making efforts on publishing both “National GHGs Inventory Report of Japan” and “GHGs Emissions Data of Japan” annually. This paper covers local Japanese inventory development from a global range to a domestic level and offers its general reporting criteria nationwide. Furthermore, through a case study of recalculating 2010 Saga Prefecture’s GHG emission, local inventory methodology is investigated in six GHGs (including CO2, CH4, N2O, HFC, PFC, and SF6) and forestry sectors. In this section, recalculating methodologies, especially regarding calculated fields and basic formulations categorized by GHG types, are introduced in detail. Then, it provides limitations and improvements of the inventory reformation. Further, future research directions are discussed as well. This research exhibits an inventory method at the local scale and offers its improvements by the author to provide some experiences and lessons for the research and mitigation policy-making practices in other parts of the world.Item Climate change modeling in the context of urban decarbonization strategy(Sumy State University, 2018) Kofanova, O.The anthropogenic influence on the Earth’s climate is growing and the risks of the irreversible impacts on ecosystems also increase. This paper is focused on the long-term prediction of the climate change in Kyiv region and decarbonization strategy development. The bcc-csm1-1 and IPSL-CM5A AR 5 climate models were used. It was determined that the average annual temperature in Kyiv region under the RCP 8.5 high-emission future scenario will increase noticeably (up to 23.8 °C according to the IPSL-CM5A model) while at the RCP 2.6 low-emission future scenario it won’t change significantly (maximum value of 11.5 °C according to the IPSL-CM5A model). So, the research recommendations were organized in order to develop decarbonization strategy for Ukraine that will help to reduce emission levels and reach the RCP 2.6 scenario. The practical and scientific value of the work is specified by the fact that obtained results take into account updated information about climate changes and can be used to increase the awareness of citizens about it. The results of the study confirm the existence and danger of the problem of climate change and show how GHG emissions can affect the ecological balance of the urbanized ecosystem. The risks of the certain natural disasters occurrence were also considered. It was found that amplification of the natural hazards is one of the main dangers of the RCP 8.5 scenario for the world, Ukraine and Kyiv region.