TY - JOUR AU - Cséfalvay, Edit AU - Kovács, Viktória Barbara AU - Szalainé Kaczkó, Orsolya Ibolya TI - Fázisváltó anyagok összehasonlító életciklus-értékelése JF - ECO-MATRIX: AZ LCA CENTER EGYESÜLET ONLINE FOLYÓIRATA J2 - ECO-MATRIX VL - 10 PY - 2024 IS - 1 SP - 33 EP - 42 PG - 10 SN - 2061-344X UR - https://m2.mtmt.hu/api/publication/34631267 ID - 34631267 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Shaheen, Reem AU - Cséfalvay, Edit TI - The effect of pretreatment and the operating temperature on reverse osmosis in make-up water preparation JF - WATER RESOURCES AND INDUSTRY J2 - WATER RESOUR IND VL - 31 PY - 2024 PG - 14 SN - 2212-3717 DO - 10.1016/j.wri.2024.100244 UR - https://m2.mtmt.hu/api/publication/34554365 ID - 34554365 N1 - Export Date: 2 February 2024 Correspondence Address: Cséfalvay, E.; Department of Energy Engineering, Műegyetem Rkp. 3, Hungary; email: csefalvay.edit@gpk.bme.hu Funding details: Magyar Tudományos Akadémia, MTA, TKP-6-6/PALY-2021 Funding details: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFI Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA, FK-143215 Funding text 1: The project was supported by the Hungarian National Research, Development and Innovation Office-NKFIH under Project Number FK-143215 . Edit Cséfalvay is grateful for the financial support the Hungarian Academy of Sciences for the scholarship for “Gyermeket Nevelő Kutatók számára" 89, 2022/KP. Project no. TKP-6-6/PALY-2021 has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research , Development and Innovation Fund , financed under the TKP2021-NVA funding scheme. The research was funded by the Sustainable Development and Technologies National Program of the Hungarian Academy of Sciences ( FFT NP FTA ). Funding text 2: Edit Cséfalvay reports financial support was provided by Hungarian National Research, Development and Innovation Office-NKFIH. Edit Cséfalvay reports financial support was provided by Hungarian Academy of Sciences. Edit Cséfalvay reports financial support was provided by National Research, Development and Innovation Fund.The project was supported by the Hungarian National Research, Development and Innovation Office-NKFIH under Project Number FK-143215. Edit Cséfalvay is grateful for the financial support the Hungarian Academy of Sciences for the scholarship for “Gyermeket Nevelő Kutatók számára" 89, 2022/KP. Project no. TKP-6-6/PALY-2021 has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-NVA funding scheme. The research was funded by the Sustainable Development and Technologies National Program of the Hungarian Academy of Sciences (FFT NP FTA). The authors thank the Department of Chemical and Environmental Process Engineering at the Budapest University of Technology and Economics for using their lab facilities to accomplish these experiments. The authors thank the help of József Csanádi and Júlia Boros, MSc student, in the lab experiments, and Emil Csonka for the ion chromatographic analyses. AB - 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 LA - English DB - MTMT ER - TY - JOUR AU - Cséfalvay, Edit AU - Kovács, Viktória Barbara TI - Environmental Sustainability of Lighter Fluids JF - ACS OMEGA J2 - ACS OMEGA VL - 9 PY - 2024 IS - 4 SP - 4277 EP - 4286 PG - 10 SN - 2470-1343 DO - 10.1021/acsomega.3c05242 UR - https://m2.mtmt.hu/api/publication/34512170 ID - 34512170 N1 - Export Date: 2 February 2024 Correspondence Address: Cséfalvay, E.; Department of Energy Engineering, Muegyetem rkp. 3., Hungary; email: csefalvay.edit@gpk.bme.hu Funding details: FK 143215 Funding details: Magyar Tudományos Akadémia, MTA, 89/2/2022/KP, TKP-6-6/PALY-2021 Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA Funding text 1: This project was supported by the Hungarian National Research and Innovation Office─NKFIH─under Project Number FK 143215. Edit Cséfalvay is grateful for the financial support of the Hungarian Academy of Sciences for the scholarship for “Gyermeket Nevelő Kutatók számára” 89/2/2022/KP. Project no. TKP-6-6/PALY-2021 has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development, and Innovation Fund, financed under the TKP2021-NVA funding scheme. This research was funded by the Sustainable Development and Technologies National Programme of MTA, the Hungarian Academy of Sciences (FFT NP FTA). AB - 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 LA - English DB - MTMT ER - TY - JOUR AU - Ősz, János AU - Cséfalvay, Edit TI - 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] JF - ENERGIAGAZDÁLKODÁS J2 - ENERGIAGAZDÁLKODÁS VL - 64 PY - 2023 IS - különszám SP - 12 EP - 19 PG - 8 SN - 0021-0757 UR - https://m2.mtmt.hu/api/publication/34023860 ID - 34023860 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Józsa, Viktor AU - Lezsovits, Ferenc AU - Cséfalvay, Edit AU - Kovács, Viktória Barbara AU - Könczöl, Sándor AU - Bereczky, Ákos AU - Laza, Tamás AU - Penninger, Antal TI - Alkalmazott tüzeléstechnikai kutatások az Energetikai Gépek és Rendszerek Tanszéken JF - ENERGIAGAZDÁLKODÁS J2 - ENERGIAGAZDÁLKODÁS VL - 64 PY - 2023 IS - különszám SP - 3 EP - 11 PG - 9 SN - 0021-0757 UR - https://m2.mtmt.hu/api/publication/34023808 ID - 34023808 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Shaheen, Reem AU - Cséfalvay, Edit TI - Investigation of coagulation and microfiltration for Danube water as the first step of make-up water production JF - CHEMICAL PAPERS / CHEMICKÉ ZVESTI J2 - CHEM PAP / CHEM ZVESTI VL - 77 PY - 2023 SP - 5531 EP - 5539 PG - 9 SN - 2585-7290 DO - 10.1007/s11696-023-02883-4 UR - https://m2.mtmt.hu/api/publication/34016980 ID - 34016980 N1 - Funding Agency and Grant Number: Budapest University of Technology and Economics. Funding text: Open access funding provided by Budapest University of Technology and Economics. AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Shaheen, Reem AU - Cséfalvay, Edit TI - The role of coagulation and microfiltration in seawater pre-treatment JF - PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING J2 - PERIOD POLYTECH CHEM ENG VL - 66 PY - 2022 IS - 4 SP - 557 EP - 564 PG - 8 SN - 0324-5853 DO - 10.3311/PPCh.20025 UR - https://m2.mtmt.hu/api/publication/32855831 ID - 32855831 N1 - Funding Agency and Grant Number: NRDI Fund (TKP2020 NC) under the Ministry for Innovation and Technology [BME-NCS] Funding text: The authors are grateful to the Department of Chemical and Environmental Process Engineering at Budapest University of Engineering and Economics for using their lab facilities to accomplish these experiments. The research reported in this paper and carried out at BME has been supported by the NRDI Fund (TKP2020 NC, Grant No. BME-NCS) based on the charter of bolster issued by the NRDI Office under the auspices of the Ministry for Innovation and Technology. LA - English DB - MTMT ER - TY - CHAP AU - Shaheen, Reem AU - Cséfalvay, Edit ED - Mihal', Mário TI - Design of ultrapure water production technology on an experimental basis: Danube water T2 - Proceedings – 48th International Conference of the Slovak Society of Chemical Engineering SSCHE 2022 and Membrane Conference PERMEA 2022 PB - Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava CY - Pozsony SN - 9788082080707 PY - 2022 PG - 7 UR - https://m2.mtmt.hu/api/publication/32852042 ID - 32852042 LA - English DB - MTMT ER - TY - JOUR AU - Cséfalvay, Edit AU - Aranyosi, Anett TI - Bioethanol, as a possible source of n-butanol JF - KÖRFORGÁSOS GAZDASÁG ÉS KÖRNYEZETVÉDELEM / CIRCULAR ECONOMY AND ENVIRONMENTAL PROTECTION J2 - CIRC ECON ENVIRON PROTECT VL - 5 PY - 2021 IS - 1 SP - 5 EP - 17 PG - 13 SN - 2560-1024 UR - https://m2.mtmt.hu/api/publication/32518189 ID - 32518189 LA - English DB - MTMT ER - TY - JOUR AU - Cséfalvay, Edit TI - Preface JF - PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING J2 - PERIOD POLYTECH CHEM ENG VL - 64 PY - 2020 IS - 3 SP - 293 EP - 295 PG - 3 SN - 0324-5853 DO - 10.3311/PPch.15941 UR - https://m2.mtmt.hu/api/publication/31531107 ID - 31531107 N1 - Export Date: 5 April 2021 Correspondence Address: Cséfalvay, E.; Department of Energy Engineering, P. O. B. 91, Hungary; email: csefalvay@mail.bme.hu Export Date: 11 July 2021 Correspondence Address: Cséfalvay, E.; Department of Energy Engineering, P. O. B. 91, Hungary; email: csefalvay@mail.bme.hu Export Date: 30 August 2021 Correspondence Address: Cséfalvay, E.; Department of Energy Engineering, P. O. B. 91, Hungary; email: csefalvay@mail.bme.hu LA - English DB - MTMT ER -