TY - BOOK AU - Aleksza, László AU - Varga, Zsolt AU - Fekete, György TI - Komposztmester. A közösségi komposztálás kézikönyve TS - A közösségi komposztálás kézikönyve PB - Magyar Agrár- és Élettudományi Egyetem CY - Gödöllő PY - 2023 SP - 79 SN - 9789636230845 UR - https://m2.mtmt.hu/api/publication/34788921 ID - 34788921 LA - Hungarian DB - MTMT ER - TY - BOOK ED - Aleksza, László ED - Fekete, György TI - A körforgásos gazdaságra történő átállás előkészítési feladatai a mezőgazdasági és zöldhulladékok esetében PB - Magyar Agrár- és Élettudományi Egyetem CY - Gödöllő PY - 2023 SP - 54 SN - 9789636230753 UR - https://m2.mtmt.hu/api/publication/34184588 ID - 34184588 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Üveges, Zsuzsanna AU - Damak, Mariem AU - Klátyik, Szandra AU - Ramay, Muhammad Wajahat AU - Fekete, György AU - Varga, Zsolt AU - Gyuricza, Csaba AU - Székács, András AU - Aleksza, László TI - Biomethane Potential in Anaerobic Biodegradation of Commercial Bioplastic Materials JF - FERMENTATION J2 - FERMENTATION-BASEL VL - 9 PY - 2023 IS - 3 SN - 2311-5637 DO - 10.3390/fermentation9030261 UR - https://m2.mtmt.hu/api/publication/33781439 ID - 33781439 AB - Bioplastics have emerged as a promising alternative to conventional plastics, marketed as environmentally friendly and sustainable materials. They provide a variety of methods for efficient waste management contributing to the goals of the circular economy. At their end-of-life stage, bioplastics can generate added value through aerobic and anaerobic biological treatments (composting or anaerobic digestion). In this study, biomethane potential (BMP) tests were carried out under mesophilic conditions on eight different catering biodegradable plastics available in the market and certified as being biodegradable under industrial composting conditions. Chemical analysis of the biodegradable plastics included elemental analysis, Fourier-transform infrared spectroscopy, and inductively coupled plasma–optical emission spectrometry. Key differences were observed in total solids (TS) and volatile solids (VS) contents between the studied biopolymer products. TS values ranged between 85.00 ± 0.26% (Product 8) and 99.16 ± 0.23% (Product 4), whereas VS content ranged between 64.57 ± 0.25 %wm (Product 6) and 99.14 ± 0.17 %wm (Product 4). Elemental analysis (elements C, H, N, S, and O) was used to estimate the theoretical methane production (ThBMP) of each product. The highest ThBMP (538.6 ± 8.7 NmL/gVS) was observed in Product 4 correlated with the highest C and H contents, while the lowest ThBMP (431.8 ± 6.1 NmL/gVS) was observed in Product 2. Significant differences were recorded between BMP values according to the chemical composition of the polymers. The average of BMP values ranged between 50.4 ± 2.1 NmL/gVS and 437.5 ± 1.0 NmL/gVS. Despite being characterized by the same composition (cellulose/cellulose derivatives and calcium carbonate), Products 2, 3, and 6 revealed significant differences in terms of TS, VS, ThBMP, and BMP. Furthermore, a significant statistical relationship (p < 0.001) was found between time (days) and BMP values of the eight products (R2 = 0.899–0.964) during the initial phase. The study confirmed that cellulose-based materials can convert efficiently under mesophilic conditions into methane, at a relatively short retention time; hence, they can be regarded as a promising material for co-digestion with feedstock in industrial anaerobic biogas plants. In contrast, biodegradation of polylactic acids (PLA) does not occur under mesophilic conditions, and hence, pre-treatment of the polymers is recommended. Moreover, PLA-containing products are highly affected by the presence of other components (e.g., polybutylene adipate terephthalate and cellulose/cellulose derivatives). LA - English DB - MTMT ER - TY - JOUR AU - Gulyás, Miklós AU - Fekete, György AU - Varga, Zsolt AU - Dér, Sándor AU - Sebők, András AU - Vojtela, Tibor AU - Aleksza, László TI - Biogas Potential and Calorific Value of Different Agricultural Main and By-Product JF - HUNGARIAN AGRICULTURAL RESEARCH: ENVIRONMENTAL MANAGEMENT LAND USE BIODIVERSITY J2 - HUNG AGRIC RES VL - 3 PY - 2022 SP - 11 EP - 15 PG - 5 SN - 1216-4526 UR - https://m2.mtmt.hu/api/publication/33726079 ID - 33726079 LA - English DB - MTMT ER - TY - JOUR AU - Pintér, Richárd AU - Fekete, György AU - Varga, Zsolt AU - Gyuricza, Csaba AU - Aleksza, László TI - Evaluation of organic wastes as substrates for rearing Zophobas morio, Tenebrio molitor, and Acheta domesticus larvae as alternative feed supplements JF - JOURNAL OF CENTRAL EUROPEAN GREEN INNOVATION J2 - J CENT EUR GREEN INNOV VL - 10 PY - 2022 IS - Suppl 1 SP - 143 EP - 156 PG - 14 SN - 2064-3004 DO - 10.33038/jcegi.3508 UR - https://m2.mtmt.hu/api/publication/33552673 ID - 33552673 N1 - JCEGI – Környezettechnológia különszám LA - English DB - MTMT ER - TY - JOUR AU - Gulyás, Miklós AU - Someus, Edward AU - Klátyik, Szandra AU - Fuchs, Márta AU - Varga, Zsolt AU - Der, Sandor AU - Fekete, György AU - Czinkota, Imre AU - Székács, András AU - Gyuricza, Csaba AU - Aleksza, László TI - Effects of Combined Application of Solid Pyrolysis Products and Digestate on Selected Soil Properties of Arenosol and Plant Growth and Composition in Laboratory Experiments JF - AGRONOMY (BASEL) J2 - AGRONOMY-BASEL VL - 12 PY - 2022 IS - 6 PG - 24 SN - 2073-4395 DO - 10.3390/agronomy12061440 UR - https://m2.mtmt.hu/api/publication/32979786 ID - 32979786 AB - Biochars as soil amendments have been reported to improve soil properties and may have an important role in the mitigation of the consequences of climate change. As a novel approach, this study examines whether biochar and digestate co-application can be utilized as cost-effective, renewable plant nutrients. The effects of two types of biochar-wood chip biochar (WBC) and animal bone biochar (ABC), applied alone or in combination with an anaerobic digestate-on soil physicochemical properties, on the levels of selected elements, and on growth yields of ryegrass were studied in laboratory experiments. Most parameters were significantly affected by the treatments, and the investigated factors (biochar type, application rate, and the presence of digestate), as well as their interactions, were found to have significant effects on the characteristics investigated. The easily soluble phosphorus content (AL-P2O5) of the soil increased in all WBC and ABC biochar treatments, and the presence of digestate caused a further increase in AL-P2O5 in the case of anaerobic digestate-supplemented ABC treatment (ABCxAD). The pH increased in both ABC and WBC treatments, and also in the case of ABCxAD treatments. Similar increases in the salt content were detected in ABC-treated samples and in ABCxAD treatments at higher application rates. WBC increased the water holding capacity and carbon content of the soil. Phytotoxic effects of biochars were not detected, although higher doses resulted in slower germination. Combined biochar-digestate applications resulted in increased plant yields compared to sole biochar treatments. Thus, biochar-digestate combinations appear to be applicable as organo-mineral fertilizers. LA - English DB - MTMT ER - TY - JOUR AU - Pintér, Richárd AU - Aleksza, László AU - Fekete, György AU - Béres, András AU - Gyuricza, Csaba TI - EFFECT OF DIFFERENT SUBSTRATE MIXTURES ON CRUDE FAT AND CRUDE PROTEIN CONTENT OF ZOPHOBAS MORIO LARVAE JF - HUNGARIAN AGRICULTURAL RESEARCH: ENVIRONMENTAL MANAGEMENT LAND USE BIODIVERSITY J2 - HUNG AGRIC RES VL - 30 PY - 2021 IS - 1 SP - 13 EP - 16 PG - 4 SN - 1216-4526 UR - https://m2.mtmt.hu/api/publication/33104798 ID - 33104798 LA - English DB - MTMT ER - TY - CHAP AU - Gulyás, Miklós AU - Edward, SOMEUS AU - Varga, Zsolt AU - Fekete, György AU - Aleksza, László ED - Kende, Zoltán TI - Effects of combined application of solid pyrolysis products and digestate on selected soil and plant properties in laboratory experiment T2 - Abstract book of the 19th Alps-Adria Scientific Workshop 26th April - 1st May 2020, Wisła, Poland PB - Szent István Egyetemi Kiadó Nonprofit Kft. CY - Gödöllő SN - 9789632698960 PY - 2020 SP - 20 EP - 20 PG - 1 UR - https://m2.mtmt.hu/api/publication/33104719 ID - 33104719 LA - English DB - MTMT ER - TY - CHAP AU - Fekete, György AU - Varga, Zsolt AU - Aleksza, László AU - Gulyás, Miklós AU - Czinkota, Imre ED - Kende, Zoltán TI - An investigation on replacement alternatives of the nutrient requirements of microalgae with agricultural byproducts T2 - Abstract book of the 19th Alps-Adria Scientific Workshop 26th April - 1st May 2020, Wisła, Poland PB - Szent István Egyetemi Kiadó Nonprofit Kft. CY - Gödöllő SN - 9789632698960 PY - 2020 SP - 31 EP - 31 PG - 1 UR - https://m2.mtmt.hu/api/publication/33104704 ID - 33104704 LA - English DB - MTMT ER - TY - JOUR AU - Harsányi, Endre AU - Juhász, Csaba AU - Kovács, Elza AU - Huzsvai, László AU - Pintér, Richárd AU - Fekete, György AU - Varga, Zsolt AU - Aleksza, László AU - Gyuricza, Csaba TI - Evaluation of Organic Wastes as Substrates for Rearing Zophobas morio, Tenebrio molitor, and Acheta domesticus Larvae as Alternative Feed Supplements JF - INSECTS J2 - INSECTS VL - 11 PY - 2020 IS - 9 PG - 17 SN - 2075-4450 DO - 10.3390/insects11090604 UR - https://m2.mtmt.hu/api/publication/31591571 ID - 31591571 LA - English DB - MTMT ER -