https://etalpykla.vilniustech.lt/handle/123456789/160338 2026-04-23T14:17:29Z https://etalpykla.vilniustech.lt/handle/123456789/160361 Unconventional resources in the context of climate change: opportunities for the development of the hemp market in Lithuania Griškevičienė, Vaida; Mickevičienė, Vaiva This article analyses the possibilities for developing non-traditional resources in Lithuania in the context of climate change, with a particular focus on bioeconomic resources such as hemp and their application in industry. Hemp, as an ecological raw material, remains a subject of scientific research that has not yet received sufficient attention, both in terms of assessing its impact on the environment during cultivation and exploring its potential for use in various industrial sectors. As one of the largest sources of pollution, industry can harness the potential of hemp, especially fibre hemp, to reduce the environmental impact of production and promote the creation of environmentally friendly products. An analysis of the processes currently underway in the European Union and Lithuania has identified several key areas: legal regulation, innovation and research, market demand, and service development. Lithuania has developed a comprehensive legal framework that facilitates the cultivation and use of hemp, but research institutions are still not sufficiently exploring the potential uses of fibre hemp in industry. Other industries, such as construction, food, and cosmetics, are already successfully using hemp products in their operations. The greatest potential is expected in segments where hemp products replace materials with a high carbon footprint, but development is limited by a lack of processing capacity, standardisation and regulatory clarity. The growing demand for organic products in Europe opens new opportunities for traditional Lithuanian hemp products. Cooperation with research institutions and innovation development can help farmers and manufacturers better understand the benefits of hemp cultivation and processing. In addition, services related to hemp processing could be developed. The article provides recommendations on how to integrate fibre hemp more effectively into industrial development. 2026-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/160360 Studies to determine the optimal coagulant dosage for the precipitation of landfill leachate pollutant Bouynk, Abderrahim; Mažeikienė, Aušra; Zigmontienė, Aušra; Marčiulaitienė, Eglė The treatment of landfill leachate is a critical environmental, social and economic issue. This type of wastewater poses a threat to the environment and human health, so European standards (Council Directive 1999/31/EC on landfill, Water Framework Directive) require its mandatory treatment. Landfill leachate is composed of different toxins and complex chemicals due to the presence of different kinds of pollutants and trash. These toxins and pollutants include heavy metals, organic pollutants, ammonium nitrogen, and xenobiotic compounds. Due to this complexity and variation in the chemical composition, conventional treatment methods such as bio-logical treatment and membrane separation often face various challenges. To address these challenges, the combination of treatment methods such as coagulation/flocculation as pretreatment followed by adsorption techniques has shown promising results in removing all the toxins at a much lower price using natural materials. This combination ensures the removal of suspended solids and colloidal matter trapped in the leachate using coagulation; the remaining dissolved organic and inorganic matter are removed by the adsorption stage. The uncertainties lie in the fact that it is not known exactly which coagulants, and at what doses, would optimally reduce the amount of organic matter in the landfill filtrate. Experimental studies are being conducted to select suitable coagulants. In this study, Al2(SO4)3 and Fe2(SO4)3 metal salt coagulants were selected for the coagulation stage. At the optimal dosages of Al2(SO4)3, a maximum TC removal of 60% was achieved, whereas Fe2(SO4)3 achieved a slightly higher value of about 62%. On the other hand, low TN removal efficiencies were achieved for both coagulants after the coagulation process alone, not exceeding 11%, confirming that coagulation process alone is insufficient for effective nitrogen removal. Subsequent adsorption stage significantly improved the treatment performance using ZMT, as overall TN removal exceeded 90% for both coagulants at the optimal doses, while the overall TC removal remains slightly effected. 2026-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/160359 Additional treatment of biologically treated wastewater using environmentally friendly sorbents Ali, Haider; Mažeikienė, Aušra; Paliulis, Dainius Biological wastewater treatment is effective for the removal of organic matter; however, residual nitrogen and phosphorus often remain in the treated effluent, contributing to eutrophication of receiving water bodies. Small and decentralized wastewater treatment plants are particularly vulnerable to fluctuating influent loads and operational constraints, which can result in elevated concentrations of ammonium and phosphate in the final effluent. This study evaluates environmentally friendly zeolite-containing sorbents as tertiary filtration media for polishing biologically treated domestic wastewater. Column filtration experiments were conducted using wastewater after biological treatment, and the performance of four sorbents was assessed by monitoring phosphate phosphorus (PO₄-P), ammonium nitrogen (NH₄-N), nitrate nitrogen (NO₃-N), and pH. The results demonstrate that zeolite-based sorbents can effectively reduce nutrient concentrations, with notable differences in removal efficiency among the tested materials. The findings indicate that sorbent-based tertiary treatment represents a sustainable and low-energy option for reducing nutrient loads from small-scale wastewater treatment facilities, contributing to improved water quality and resourceoriented wastewater management. 2026-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/160358 Circular economy analysis in 3 districts of Lima, Peru Poggi, Johanna; Romero, Gabriela; Guerrero, Marisley; Marroquin, Flavia; Yancce, Kimberly The proposed research is based on investigating the circularity of three districts in the city of Lima, the capital of Peru, located in different areas of the city: East Lima, South Lima, and North Lima. The variables to be analyzed within circular economy strategies are solid waste management, recycling, innovation, sustainability indicators, sustainable construction, and environmental education. The results obtained can be used in future studies as well as in management plans for these districts and other areas of the city. 2026-01-01T00:00:00Z