14 results on '"Praspaliauskas, M."'
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2. Properties of biofuel fly ash and capabilities of its use for agricultural needs
- Author
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Kulokas, M., Zaleskas, V., Pedišius, N., Praspaliauskas, M., and Buinevičius, K.
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fly ash ,article ,articles ,biofuel ,agromass ,chemical and physical properties - Abstract
Article The use of various types of biomass for energy production provides great prospects for reducing the consumption of fossil fuels and the negative impact on the environment. However, the use of biomass, in particular agromass for this purpose, results in relatively large amounts of bottom ashes and fly ashes, the composition and properties of which also raise a number of additional environmental problems. The composition and properties of fly ash are investigated in the paper, taking into account the possibilities of utilizing them for soil fertilization and other applications. Fly ash samples were collected from bunkers of flue gas cleaning equipment (electrostatic precipitator and cyclones) installed after water heating boilers, which are firing wood chips and chuffed straw. The composition of fly ash was determined using Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) and Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS) while particle size distribution was obtained using scattered-light aerosol spectrometer. Electrical Low Pressure Impactor (ELPI) was used to separate fly ash into 14 groups by particle diameter, and the analysis of their composition showed differences in the composition of the fly ash collected in cyclones and Electrostatic Precipitators (ESP). An analysis of the composition of samples in regard to the existing heavy metals norms and considering concentrations of elements beneficial to the growth of plants, enables to prepare recommendations for fertilization. The determined alkalinity of fly ash pH 13 confirms the possibility of their use for reducing soil acidity. The analysis of fly ash composition has shown that they contain elements, important for plant growth (Ca, Mg, K, P, N, S), and their concentrations determine the further use for soil quality improvement because the amount of these elements in the acid soils is reduced.
- Published
- 2019
3. Study of chemical composition of agricultural residues from various agro-mass types
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Praspaliauskas, M., primary, Pedišius, N., additional, Čepauskienė, D., additional, and Valantinavičius, M., additional
- Published
- 2019
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4. Spontaneous Emission Measurements of Selected Alkali Radicals during the Combustion of a Single Biomass Pellet
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Sadeckas, M., primary, Striu̅gas, N., additional, Andriu̅nas, P., additional, Navakas, R., additional, Praspaliauskas, M., additional, Rabaçal, M., additional, and Costa, M., additional
- Published
- 2018
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5. A review of sludge characteristics in Lithuania's wastewater treatment plants and perspectives of its usage in thermal processes
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Praspaliauskas, M., primary and Pedišius, N., additional
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- 2017
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6. The Investigation of Syngas Formation in Co-gasification of Dried Sewage Sludge Mixtures with Wood Biomass
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Praspaliauskas, M., Pedišius, N., Vonžodas, T., and Valantinavičius, M.
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Biomass - Abstract
Nowadays one of the important tasks is reduction of generated sewage sludge volumes and its effective utilization. However, such utilization of sewage sludge is still considered as subject for investigation, because sewage sludge in most cases contains high concentrations of pollutants, among which are very toxic heavy metals (HM). Part of harmful substances together with flue gases are released into the environment and depending on amount of sludge in the fuel mixture could increase the pollutants in the emission gases significantly. The most common elements found in the emission gases are As, Be, B, Cd, Cr, Cr, Co, Pb, Mn, Hg, Mo, Se Sr, TI, ir V. During the first stage of investigation there were established the main parameters of fuel mixtures consisting of sewage sludge and wood biomass (30ss/70wp, 50ss/50wp, 70ss/30wp) as well as unmixed sewage sludge and wood pellets: moisture, calorific value, amounts of CHNS-O, ash-content, volatile matter, chlorine content, ash melting temperature, heavy metals. Thermogravimetric analysis of various fuel mixtures was done at the selected gasification parameters, when the temperature was constantly raising up to 995 °C every 20 °C /min, and the amount of inlet air was changed respectively 5 %, 10 % and 17.5 %. The composition of singas of gasified sewage sludge and its mixture with wood biomass was studied using gas chromotograph/mass spectrometer (GC-MS)., Proceedings of the 22nd European Biomass Conference and Exhibition, 23-26 June 2014, Hamburg, Germany, pp. 217-220
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- 2014
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7. The Investigation of Torrefaction and Properties of Formed Products from Agro-cultural Residues and Woody Biomass
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Valantinavičius, M., Vonžodas, T., Praspaliauskas, M., and Pedišius, N.
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Biomass - Abstract
During past 20 years, the use of agro-culture residues for energy recovery significantly increased. While there are many ways to recover energy from agro-culture residues, such as pyrolysis, gasification or combustion, scientists have great interest in torrefaction process, because after this process biomass has higher (~30%) energy density. Torrefaction, also known as mild-pyrolysis, for the pre-treatment of biomass, is a thermal process that occurs at 200-300°C under an inert atmosphere and low heating rates. During the process biomass is dried, releasing CO2 (~20 %), CO (~80 %) and small amount volatile organics. By using thermo – gravimetric analyser and torrefaction reactor mass loses where investigated as well ultimate and proximate analysis of different agro-culture residues samples., Proceedings of the 22nd European Biomass Conference and Exhibition, 23-26 June 2014, Hamburg, Germany, pp. 214-216
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- 2014
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8. Effect of Burned Multi-Crop Ashes on Faba Bean-Development Parameters.
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Petlickaitė R, Romaneckas K, Sinkevičienė A, Praspaliauskas M, and Jasinskas A
- Abstract
The use of burned plant biomass ashes could help not only with respect to utilizing combustion residues, but also with respect to optimizing the nutrition of cultivated agricultural plants without harming the environment. With this aim, a pot experiment of the effects of multi-crop biomass ash on faba bean seedlings was carried out in the Academy of Agriculture of the Vytautas Magnus University (VMU). Four ash fertilization rates were tested: 1. unfertilized (N0, comparative-control treatment); 2. fertilized at a low rate (N1, 200 kg ha
-1 ); 3. fertilized at an average rate (N2, 1000 kg ha-1 ); 4. fertilized at a high rate (N3, 2000 kg ha-1 ). Final observations showed that ash fertilization significantly increases the height of faba bean sprouts by 21-38%, the length of the roots by 10-20% and the chlorophyll concentration in the leaves by 17%. The average green biomass of faba bean sprouts consistently increased with increasing fertilization rate, from 56% to 209%. Dried biomass increased by 160-220%. With increasing ash fertilization rate, the percentage of dry matter in the roots decreased by 10-50%. We recommend fertilizing faba bean with medium (1000 kg ha-1 ) and high (2000 kg ha-1 ) ash rates, as these rates led to the largest plants with the highest productivity potential.- Published
- 2024
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9. Biomass gasification to syngas in thermal water vapor arc discharge plasma.
- Author
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Tamošiūnas A, Gimžauskaitė D, Aikas M, Uscila R, Snapkauskienė V, Zakarauskas K, and Praspaliauskas M
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This study investigated biomass (wood pellets) gasification to syngas using direct current (DC) thermal arc plasma at atmospheric pressure. Water vapor was used as a main gasifying agent and a plasma-forming gas. The biomass gasification system was quantified in terms of the producer gas composition, the tar content, the H
2 /CO ratio, the carbon conversion efficiency, the energy conversion efficiency and the specific energy requirements. It was found that the gasification performance efficiency was highest at the water vapor-to-biomass ratio of 0.97. The producer gas was mostly composed of H2 (43.86 vol.%) and CO (30.93 vol.%), giving the H2 /CO ratio of 1.42 and the LHV of 10.23 MJ/Nm3 . However, high content of tars of 13.81 g/Nm3 was obtained in the syngas. The yield of H2 and CO was 48.31% and 58.13%, respectively, with the highest producer gas yield of 2.42 Nm3 /kg biomass. The carbon conversion efficiency and the energy conversion efficiency were 100% and 48.83%, respectively, and the production of 1 kg of syngas required 1.78 kWh of electric energy input. Finally, the obtained results were compared with different plasma methods, including plasma-assisted application coupled with conventional gasification., Competing Interests: Conflict of interestThe authors declare no competing interests., (© The Author(s) 2023.)- Published
- 2023
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10. Oilseed rape (Brassica napus L.) potential to remediate Cd contaminated soil under different soil water content.
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Kniuipytė I, Dikšaitytė A, Praspaliauskas M, Pedišius N, and Žaltauskaitė J
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- Water, Cadmium, Environmental Pollution, Soil, Brassica napus
- Abstract
Changes in soil moisture content accompanying ongoing climate change are expected to affect plant growth and contaminants behaviour in the soil. The study was aimed at investigating soil water content impact on the energy crop oilseed rape (Brassica napus L.) efficiency to remediate Cd contaminated soil (1-250 mg kg
-1 ). B. napus growth, Cd accumulation and removal efficiency were evaluated under optimal, reduced and elevated soil water content (SWC). B. napus showed good tolerance to Cd contamination and ability to phytoextract Cd from the soil. Cd accumulation in oilseed rape increased with Cd soil concentration, whereas removal efficiency was regulated by rape growth and Cd soil concentrations. B. napus has demonstrated good efficiency to cope with low and moderate Cd pollution (with tolerance index TI > 0.69), while high Cd soil pollution had a highly significant adverse impact on plant growth (growth was reduced up to 90%) resulting in low Cd removal efficiency. SWC governed plant growth, Cd accumulation and removal from the soil. Oilseed rapes grown under elevated SWC were of higher biomass (18%) compared to those grown under reduced SWC though the detrimental effect of Cd was more severe at elevated SWC. Reduced SWC led to decreased Cd uptake, conversely elevated SWC promoted Cd uptake. The optimal SWC ensures the highest Cd removal efficiency, whereas soil water deficit or excess restricts B. napus potential to remove Cd from the soil and prolongs remediation., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Ltd. All rights reserved.)- Published
- 2023
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11. Earthworm Eisenia fetida potential for sewage sludge amended soil valorization by heavy metal remediation and soil quality improvement.
- Author
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Žaltauskaitė J, Kniuipytė I, and Praspaliauskas M
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- Animals, Quality Improvement, Sewage, Soil, Metals, Heavy analysis, Oligochaeta, Soil Pollutants analysis
- Abstract
Sewage sludge reuse in agriculture is increasing, however it can be an important route for contaminants to enter the environment. The aim of this study was to evaluate earthworm Eisenia fetida capability to reduce heavy metal content in the sewage sludge (SS) amended soil and increase soil fertility in terms of soil nutrients content. Adult earthworms were introduced into aged SS amended soil (0-200 Mg ha
-1 ) and left for 65 days. Earthworms have stabilized soil pH and accelerated organic matter mineralization. The concentrations of most heavy metals during the vermiremediation sharply decreased, K and Mg decreased to a moderate extent, whereas Ca content has increased. The highest removal efficiency was detected for Ni, Co and Mn (> 80%), bioconcentration factors were as follows Zn > Co > Cu > Ni > Mn > Cr. The content of major nutrients (S, P) was substantially higher compared to the initial values. The most efficient remediation and soil quality improvement was achieved under the doses of 25-50 Mg ha-1 . Higher (≥ 100 Mg ha-1 ) doses might restrict this technique application because of earthworm mortality and retarded growth. Overall, the study shows that vermiremediation might be a sustainable technique for ecological stabilization of SS amended soil and converting to usable for agricultural needs., (Copyright © 2021 Elsevier B.V. All rights reserved.)- Published
- 2022
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12. Biological assessment of contaminated shooting range soil using earthworm biomarkers.
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Česynaitė J, Praspaliauskas M, Pedišius N, and Sujetovienė G
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- Animals, Biomarkers, Environmental Pollution, Soil, Oligochaeta, Soil Pollutants analysis, Soil Pollutants toxicity
- Abstract
Environmental contamination at shooting ranges is a widely known ecological problem. The aim of the study was to evaluate the extent of contamination and the ecotoxicity of a shooting range soil assessing the physiological and biochemical effects on earthworm Eisenia fetida (Savigny). Adult E. fetida were exposed to the soils collected from different distances of the shooting range for 28 days. High concentrations of Pb (53023 mg kg
-1 ), increased concentrations of Ni (12 mg kg-1 ) and Sb (600 mg kg-1 ), significantly higher soil organic matter content (7.2%) and density (6.14 g cm-3 ) were determined in the backstop berm soil. Significant weight loss (44.4%) of the adult earthworms after 28 days of exposure occurred in the most contaminated shooting range soil and significantly higher concentrations of Pb (3101 mg kg-1 ), Cu (51 mg kg-1 ), Ni (2 mg kg-1 ), and Sb (20 mg kg-1 ) were determined in the tissues of worms, and no juveniles found there. Juveniles exposed to the less contaminated soil of the shooting range (A, B and C) accumulated significant concentrations of Pb, Cu, Fe, Mn, and Zn. The antioxidant enzymatic activity (glutathione-s-transferase (GST)) decreased, and lipid peroxidation increased as indicated by an increase in malondialdehyde (MDA) level in earthworms exposed to the contaminated soil. A compensatory mechanism between the activities of glutathione reductase (GR) and GST in earthworms exposed to these soils was confirmed., (© 2021. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)- Published
- 2021
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13. Pyrolysis Kinetic Behaviour of Glass Fibre-Reinforced Epoxy Resin Composites Using Linear and Nonlinear Isoconversional Methods.
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Yousef S, Eimontas J, Striūgas N, Praspaliauskas M, and Abdelnaby MA
- Abstract
Due to the increasing demand for glass fibre-reinforced epoxy resin composites (GFRC), huge amounts of GFRC waste are produced annually in different sizes and shapes, which may affect its thermal and chemical decomposition using pyrolysis technology. In this context, this research aims to study the effect of mechanical pre-treatment on the pyrolysis behaviour of GFRC and its pyrolysis kinetic. The experiments were started with the fabrication of GFRC panels using the vacuum-assisted resin transfer method followed by crushing the prepared panels using ball milling, thus preparing the milled GFRC with uniform shape and size. The elemental, proximate, and morphology properties of the panels and milled GFRC were studied. The thermal and chemical decomposition of the milled GFRC was studied using thermogravimetric coupled with Fourier-transform infrared spectroscopy (TG-FTIR) at different heating rates. Meanwhile, the volatile products were examined using TG coupled with gas chromatography-mass spectrometry (GC-MS). The TG-FTIR and TG-GC-MS experiments were performed separately. Linear (Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (FWO), and Friedman) and nonlinear (Vyazovkin and Cai) isoconversional methods were used to determine the pyrolysis kinetic of the milled GFRC based on thermogravimetry and differential thermal gravimetry (TG/DTG). In addition, the TG/DTG data of the milled GFRC were fitting using the distributed activation energy model and the independent parallel reactions kinetic model. The TG results showed that GFRC can decompose in three stages, and the main decomposition is located in the range 256-500 °C. On the other hand, aromatic benzene and a C-H bond were the major functional groups in the released volatile components in FTIR spectra, while phenol (27%), phenol,4-(1-methylethyl) (40%), and p-isopropenylphenol (34%) were the major compounds in GC-MS analysis. Whereas, the kinetic results showed that both isoconversional methods can be used to determine activation energies, which were estimated 165 KJ/mol (KAS), 193 KJ/mol (FWO), 180 KJ/mol (Friedman), 177 KJ/mol (Vyazovkin), and 174 KJ/mol (Cai).
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- 2021
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14. Do plants respond and recover from a combination of drought and heatwave in the same manner under adequate and deprived soil nutrient conditions?
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Dikšaitytė A, Viršilė A, Žaltauskaitė J, Januškaitienė I, Praspaliauskas M, and Pedišius N
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- Stress, Physiological, Brassica napus physiology, Droughts, Extreme Heat, Soil chemistry
- Abstract
Extreme climatic conditions with extended drought periods and heatwaves are predicted to increase in frequency and severity in many regions of the world. Aside from this, other abiotic stress factors such as nutrient deficiency could pose a serious problem to plants when combined with other stressors resulting in more complex underpinning mechanisms. In the present study, we evaluated the response of Brassica napus to single and combined impacts of drought and heatwave (HW) under adequate or deprived (N-A and N-D) soil nutrient conditions. In addition, to get better insights in the plant response to combined stress, a post-stress period, pointing out a degree of the recovery after the cessation of stress, was also included. The results showed a different manner of single drought and heatwave action. The adverse effect of drought on leaf gas exchange was lagged on the growth and became more apparent only after recovery period with no obvious difference between different nutrient levels. Contrary, the growth response of nutrient-deprived plants to single HW was weak and in most cases, insignificant. Heatwave applied simultaneously with drought highly exacerbated the adverse effect of drought both under N-A and N-D conditions. Combined drought and heatwave stress resulted in the sharper decline of A
sat and it was attributed to both stomatal and non-stomatal limitations. Interestingly, plants underwent combined drought and HW treatment under N-D conditions showed better aboveground growth recovery, compared to those grown under N-A conditions, while displayed far more diminished photochemistry of photosystem II and badly disturbed the C/N balance. This discrepancy came from the fact that soil nutrient deficiency, by itself, evoked strong stress under control climate conditions resulting in a dramatically slower aboveground growth of nutrient-deprived plant. In turn, although combined drought and HW stress had similar effect on the aboveground growth either under N-A or N-D conditions, the recovery of later one was better. These results highlight the necessity to look at plants' performance under unfavorable environmental conditions beyond the actual event, since it can be depended not only on the duration of exposure but also on the legacy effect after treatment., (Copyright © 2019 Elsevier B.V. All rights reserved.)- Published
- 2020
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