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001-es BibID:	BIBFORM129808
Első szerző:	Kun Sándor (környezetgazdálkodási agrármérnök)
Cím:	Impact of intense rainfall event on the physicochemical and microbiological characteristics of an urban stream / Sándor Kun, Imre Boczonádi, Péter Tamás Nagy, Andrea Szabó, Florence Alexandra Tóth, Zsolt Zoltán Fehér, Tamás Magyar, Lili Adrienn Madar, István Szűcs, János Tamás, Attila Nagy
Dátum:	2025
Megjegyzések:	Extreme weather events, including sudden and intense rainfall, have become increasingly frequent due to the growing impact of climate change. This rapid influx of water often carries a variety of pollutants, including nutrients, heavy metals, and microbial contaminants, significantly modifying the physicochemical and microbiological characteristics of urban streams. This study aims to evaluate the effects of rainfall events on the physicochemical and microbiological properties of the Tócó Stream, focusing on changes in key water quality parameters and microbial dynamics. Two sampling points were selected to represent different environmental areas: one site was located in a near-natural area, and the other was situated in an industrial zone, surrounded by facilities and a highway connecting road. Measurements were conducted both before and after the rainfall event. On-site measurements were performed included precipitation (mm), water level, dissolved oxygen content, and water temperature, while water samples were collected for laboratory analysis. The collected samples were tested for pH and electrical conductivity (EC) as well as for nutrient-concentrations of NH??, NO??, NO??, PO???, K?, SO???, chemical oxygen demand (COD) and biological oxygen demand (BOD5) were also determined from the samples. In case of microbiological parameters, total coliforms, yeasts, and total plate count were determined. Our results revealed differences between the two sampling sites and the pre- and post-rainfall conditions. At the industrial site the nutrient contents have decreased due to the rainfall, while at the near natural site we did not determine such change in connection with these elements. The same trend were detected in the case of EC as well. The microbiological analysis of the water samples clearly showed that while both total bacterial count and total coliform count showed an increasing trend after the rainfall at the first site, this trend was much less pronounced at the site reflecting the natural state. Our objecitve was to study the influence of sudden rainfall events, for the reason that these effects remain understudied, particularly in terms of their short- and long-term impacts on water quality and microbial properties.
Tárgyszavak:	Természettudományok Környezettudományok előadáskivonat könyvrészlet urban stream water quality microbiology chemical properties
Megjelenés:	EGU General Assembly 2025. - p. EGU25-19738
További szerzők:	Boczonádi Imre (1988-) (biotechnológus) Nagy Péter Tamás (1970-) (vegyész) Szabó Andrea (1994-) (környezetgazdálkodási agrármérnök) Tóth Florence Alexandra (1973-) (biológus, molekuláris- és sejtbiológia) Fehér Zsolt Zoltán (1984-) (geoinformatika) Magyar Tamás (1987-) (környezetmérnök) Madar Lili Adrienn Szűcs István (2001-) Tamás János (1959-) (környezetgazdálkodási agrármérnök) Nagy Attila (1982-) (környezetgazdálkodási agrármérnök)
Pályázati támogatás:	RRF 2.3.1 21 2022 00008 Egyéb
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001-es BibID:	BIBFORM094689
035-os BibID:	(Scopus)85108577674
Első szerző:	Magyar Tamás (környezetmérnök)
Cím:	Characterization of the biodegradation of synthetic and organic wastewater in an anaerobic tank reactor using microalgae / Tamás Magyar, Felipe Werle Vogel, Florence Tóth, Attila Nagy, János Tamás, Péter Tamás Nagy
Dátum:	2021
ISSN:	2062-0810 2063-4269
Megjegyzések:	The anaerobic digestion is a well-known method in waste management of biodegradable wastes to transform waste to energy. Proper digestion requires optimal fermentation conditions to improve the quality and yield of biogas. The objective of this study was to characterize the biodegradation process of synthetic and organic wastewater. Microalgae (Chlorella vulgaris) were utilized as a bioindicator for anaerobic digestion and monitoring of the fermentation process. Besides bioindication, the viability of the microalgae and the chlorophyll concentration were also assessed in such fermentation processes, since microalgae can be a potential source for biofuel production and a plant nutrient. The biodegradation process was studied for a month in an anaerobic tank reactor. The fermentation processes and lengths of the fermentation stages were successfully monitored and separately identified based on the pH and gas development. Furthermore, the amount and dynamics of the biogas yield also revealed that the fermentation process was about 510 hours in both cases. In contrast, increased temperature in thermophilic range (45?C) accelerates the degradation processes and resulted in shorter hydrolysis (60 hours), acetogenesis (24 hours) and longer methanogenesis (81 hours) stages, where higher biogas yield was also achieved (59.3%). During the process, the concentration of nutrients showed logarithmical tendencies and COD showed power tendency in time. The extent and the direction of the changes were in correspondence with microalgae activity. In thermophilic circumstances, living microalgae biomass dropped significantly without recovery therefore such an environment is not a viable option for microalgae growth. Moreover, dead microalgae biomass seems to act as a substrate for fermentation slightly increasing the concentration of some nutrients in the wastewater.
Tárgyszavak:	Műszaki tudományok Agrárműszaki tudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk anaerobic tank reactor degradation stages synthetic and organic wastewater microalgae nutrients biogas
Megjelenés:	International Review of Applied Sciences and Engineering. - 12 : 2 (2021), p. 166-175. -
További szerzők:	Werle Vogel, Felipe Tóth Florence Alexandra (1973-) (biológus, molekuláris- és sejtbiológia) Nagy Attila (1982-) (környezetgazdálkodási agrármérnök) Tamás János (1959-) (környezetgazdálkodási agrármérnök) Nagy Péter Tamás (1970-) (vegyész)
Pályázati támogatás:	ED_18-1-2019-0028 Egyéb
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001-es BibID:	BIBFORM102673
Első szerző:	Nagy Attila (környezetgazdálkodási agrármérnök)
Cím:	Comparison of the effects of manure-based product and ammonium nitrate on maize (Zea mays L.) / Nagy Attila, Kiss Nikolett Éva, Gorliczay Edit, Tóth Florence, Szőllősi Nikolett, Tamás Janos
Dátum:	2022
ISSN:	2066-6276 2601-5676
Megjegyzések:	The storage and application of huge amounts of deep litter manure could be a serious issue generated by livestock systems. As broiler litter has high N and fiber content, pre-treatment is strongly recommended. Composting is one of the key method of pre-treatment. Due to Georgakakis and Krintas (2000), Hosoya composting system is suitable for composting by-products with unfavourable properties such as poultry litter. The end-product (composted and pelletized poultry litter (CPPL)) is appropriate alternative to the substitute for chemical fertilizers, due to its pathogen-free, safe-to-use features and high organic content while it meets the requirements of the European Green Deal's goals. In the frame of research maize (ZEA MAYS L.) plant test was carried out to get information about the effects of CPPL and ammonium nitrate (AN) fertilizer in pot experiment conditions. Measurements cover the following analyses: the length of the roots, stems, and seedlings, the dry matter content, germination percent, Vigour-index, and chlorophyll and carotenoid content. On the whole, it can be stated that CPPL had higher stimulating impacts on measured parameters (root length, dry matter content, Vigour index) in comparison to AN with higher N content.
Tárgyszavak:	Agrártudományok Növénytermesztési és kertészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk composted and pelletized poultry litter ammonium nitrate maize pot experiment European Green Deal
Megjelenés:	Natural Resources and Sustainable Development. - 12 : 1 (2022), p. 73-86.
További szerzők:	Kiss Nikolett Éva (1992-) (Környezetgazdálkodási agrármérnök) Gorliczay Edit (1991-) (környezetgazdálkodási agrármérnök) Tóth Florence Alexandra (1973-) (biológus, molekuláris- és sejtbiológia) Szőllősi Nikolett (1983-) (gazdasági agrármérnök) Tamás János (1959-) (környezetgazdálkodási agrármérnök)
Pályázati támogatás:	GINOP-2.2.1.-15-2017-00043 GINOP
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