@article{MTMT:34631267, title = {Fázisváltó anyagok összehasonlító életciklus-értékelése}, url = {https://m2.mtmt.hu/api/publication/34631267}, author = {Cséfalvay, Edit and Kovács, Viktória Barbara and Szalainé Kaczkó, Orsolya Ibolya}, journal-iso = {ECO-MATRIX}, journal = {ECO-MATRIX: AZ LCA CENTER EGYESÜLET ONLINE FOLYÓIRATA}, volume = {10}, unique-id = {34631267}, issn = {2061-344X}, year = {2024}, pages = {33-42}, orcid-numbers = {Kovács, Viktória Barbara/0000-0002-3736-3329} } @article{MTMT:34554365, title = {The effect of pretreatment and the operating temperature on reverse osmosis in make-up water preparation}, url = {https://m2.mtmt.hu/api/publication/34554365}, author = {Shaheen, Reem and Cséfalvay, Edit}, doi = {10.1016/j.wri.2024.100244}, journal-iso = {WATER RESOUR IND}, journal = {WATER RESOURCES AND INDUSTRY}, volume = {31}, unique-id = {34554365}, abstract = {Raw water cannot be used directly to compensate for water losses in power plants. Thus, a series of technological steps are required to produce ultra-pure water from fresh- or seawater. This study recommends using a proper pretreatment consisting of two-steps of microfiltration, ultrafiltration and nanofiltration. Desalination was carried out using two stages of reverse osmosis. The effect of increasing feed temperature from 25 °C to 48 °C on the second stage of reverse osmosis was studied and showed an exponential increase in flux and permeability, and reduced operation time. For freshwater, no temperature effect was observed on rejection in this temperature range; however, the highest rejection values calculated based on conductivity were observed at a 40 % recovery at all temperatures in seawater (96.6 % and 97.6 % at 48 and 25 °C, respectively). As a result of the multiparameter evaluation using the ranking method for the second reverse osmosis stage, 36 °C is found to be the optimum temperature. © 2024 The Authors}, keywords = {TEMPERATURE; Seawater; Fresh Water; PRETREATMENT; temperature effect; water treatment; Desalination; Microfiltration; Feed temperature; water loss; REVERSE OSMOSIS; REVERSE OSMOSIS; Pre-treatments; Water filtration; Multiparameters; Operating temperature; Raw water; Ultra-pure water; Make-up water treatment; Make-up water treatment; Multiparameter evaluation; Multiparameter evaluation}, year = {2024}, eissn = {2212-3717} } @article{MTMT:34512170, title = {Environmental Sustainability of Lighter Fluids}, url = {https://m2.mtmt.hu/api/publication/34512170}, author = {Cséfalvay, Edit and Kovács, Viktória Barbara}, doi = {10.1021/acsomega.3c05242}, journal-iso = {ACS OMEGA}, journal = {ACS OMEGA}, volume = {9}, unique-id = {34512170}, issn = {2470-1343}, abstract = {Lighter fluids are consumer products used only at a low-volume scale, representing a realizable goal of fossil fuel replacement by renewables. Physicochemical properties of four fossil-based conventional lighter fluids (Ronsonol, Zippo, Landmann, and Terracotta) and six selected biomass-based chemicals (γ-valerolactone, ethyl-levulinate, ethanol, n-butanol, γ-valerolactone 90% v/v and ethanol 10% v/v, and ethyl-levulinate 90% v/v and ethanol 10% v/v mixtures) as potential biomass-based lighter fluids were assessed. Assessments were carried out in terms of safety, toxicological, and environmental viewpoints, represented by a flash point, boiling point, vapor pressure values, and evaporation rates; oral toxicity measured on rats; and real ethanol equivalent values, respectively. Parameters were collected where available; in the absence of literature data, they were calculated or measured and then analyzed. Finally, multicriteria analysis based on the flash point, boiling point, vapor pressure, toxicity, and ethanol equivalent values revealed γ-valerolactone as a renewable substance, which can be a promising alternative to replace fossil-based lighter fluids because it was awarded as the first in the multicriteria evaluation by obtaining the highest value of the overall scores. In practical usage, however, ignition, combustion experiments, flue gas, and emission analysis are also required to underline its commercial use in the future. © 2024 The Authors. Published by American Chemical Society}, year = {2024}, eissn = {2470-1343}, pages = {4277-4286}, orcid-numbers = {Kovács, Viktória Barbara/0000-0002-3736-3329} } @article{MTMT:34023860, title = {Gőzerőművek vízüzeme — az Energetikai Gépek és Rendszerek Tanszék szakértői szerepe és kutatási eredmények az elmúlt 20 évben [Water regime of thermal power plants - the expert role and research results of the Department of Energy Engineering in the last 20 years]}, url = {https://m2.mtmt.hu/api/publication/34023860}, author = {Ősz, János and Cséfalvay, Edit}, journal-iso = {ENERGIAGAZDÁLKODÁS}, journal = {ENERGIAGAZDÁLKODÁS}, volume = {64}, unique-id = {34023860}, issn = {0021-0757}, year = {2023}, pages = {12-19} } @article{MTMT:34023808, title = {Alkalmazott tüzeléstechnikai kutatások az Energetikai Gépek és Rendszerek Tanszéken}, url = {https://m2.mtmt.hu/api/publication/34023808}, author = {Józsa, Viktor and Lezsovits, Ferenc and Cséfalvay, Edit and Kovács, Viktória Barbara and Könczöl, Sándor and Bereczky, Ákos and Laza, Tamás and Penninger, Antal}, journal-iso = {ENERGIAGAZDÁLKODÁS}, journal = {ENERGIAGAZDÁLKODÁS}, volume = {64}, unique-id = {34023808}, issn = {0021-0757}, year = {2023}, pages = {3-11}, orcid-numbers = {Józsa, Viktor/0000-0003-1220-3748; Kovács, Viktória Barbara/0000-0002-3736-3329; Bereczky, Ákos/0000-0003-0728-2445} } @article{MTMT:34016980, title = {Investigation of coagulation and microfiltration for Danube water as the first step of make-up water production}, url = {https://m2.mtmt.hu/api/publication/34016980}, author = {Shaheen, Reem and Cséfalvay, Edit}, doi = {10.1007/s11696-023-02883-4}, journal-iso = {CHEM PAP / CHEM ZVESTI}, journal = {CHEMICAL PAPERS / CHEMICKÉ ZVESTI}, volume = {77}, unique-id = {34016980}, issn = {2585-7290}, abstract = {A comparison of coagulation with two coagulants, poly-aluminum chloride (PACl) and ferric chloride (FeCl 3 ), followed by microfiltration, was evaluated to obtain a better coagulant for an efficient pretreatment method for make-up water preparation from Danube water for thermal power plants. Efficiency was determined by chloride concentration and retention based on the total suspended solid content of the treated water samples. Results were compared to microfiltration working alone as a chemical-free pretreatment. Addition of PACl resulted in the lowest total suspended solid content (18.0 ± 1.3 mg/L), slightly lower than obtained for microfiltration alone (19.6 ± 2.5 mg/L) and significantly lower than for FeCl 3 (25.0 ± 3.3 mg/L). Regarding the retention values, coagulation with PACl followed by microfiltration, microfiltration working alone and coagulation with FeCl 3 followed by microfiltration represented retention values of 68%, 66.21%, and 56.89%, respectively. Considering the chloride concentration, it remained constant after microfiltration alone; meanwhile, adding coagulants showed a significant rise, ~ 6.4- and 5.7-times higher than the raw water's value after adding FeCl 3 and PACl, respectively. From environmental viewpoint, microfiltration alone is recommended because it can provide a steady flux and low total suspended solid content without additional load of chloride ion which shall be eliminated in the further desalination step.}, year = {2023}, eissn = {1336-9075}, pages = {5531-5539} } @article{MTMT:32855831, title = {The role of coagulation and microfiltration in seawater pre-treatment}, url = {https://m2.mtmt.hu/api/publication/32855831}, author = {Shaheen, Reem and Cséfalvay, Edit}, doi = {10.3311/PPCh.20025}, journal-iso = {PERIOD POLYTECH CHEM ENG}, journal = {PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING}, volume = {66}, unique-id = {32855831}, issn = {0324-5853}, year = {2022}, eissn = {1587-3765}, pages = {557-564} } @inproceedings{MTMT:32852042, title = {Design of ultrapure water production technology on an experimental basis: Danube water}, url = {https://m2.mtmt.hu/api/publication/32852042}, author = {Shaheen, Reem and Cséfalvay, Edit}, booktitle = {Proceedings – 48th International Conference of the Slovak Society of Chemical Engineering SSCHE 2022 and Membrane Conference PERMEA 2022}, unique-id = {32852042}, year = {2022} } @article{MTMT:32518189, title = {Bioethanol, as a possible source of n-butanol}, url = {https://m2.mtmt.hu/api/publication/32518189}, author = {Cséfalvay, Edit and Aranyosi, Anett}, journal-iso = {CIRC ECON ENVIRON PROTECT}, journal = {KÖRFORGÁSOS GAZDASÁG ÉS KÖRNYEZETVÉDELEM / CIRCULAR ECONOMY AND ENVIRONMENTAL PROTECTION}, volume = {5}, unique-id = {32518189}, year = {2021}, eissn = {2560-1024}, pages = {5-17} } @article{MTMT:31531107, title = {Preface}, url = {https://m2.mtmt.hu/api/publication/31531107}, author = {Cséfalvay, Edit}, doi = {10.3311/PPch.15941}, journal-iso = {PERIOD POLYTECH CHEM ENG}, journal = {PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING}, volume = {64}, unique-id = {31531107}, issn = {0324-5853}, year = {2020}, eissn = {1587-3765}, pages = {293-295} }