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Reduction of Greenhouse Gas Emissions by Replacing Fertilizers with Digestate

Kowalczyk-Juśko Alina, Pochwatka Patrycja, Mazurkiewicz Jakub, Pulka Jakub, Kępowicz Barbara, Janczak Damian, Dach Jacek

Journal of Ecological Engineering

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2023

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Vol. 24, nr 4

312--319

EN

Digestate from a biogas plant can be a valuable organic and mineral fertilizer. Quantitative proportions of cosubstrates used in three agricultural biogas plants in Poland were analyzed. The composition of digestates was examined and large differences in the content of macronutrients were found, especially N and K. On the basis of the factors used to calculate emissions from the production and use of artificial fertilizers, the greenhouse gas (GHG) reduction resulting from replacing mineral fertilizers with digestate was calculated. In terms of 1 Mg of fresh digestate, this reduction may not seem large, as it amounts to 27.9–61.6 kg of CO2 eq, but it should be taken into account that digestate contains little dry matter. The annual amount of digestate used on an area of 1 ha allows avoiding GHG emissions of 25.8–44.5 Mg CO2 eq.

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Food Waste Management Using the Hermetia Illucens Insect

Czekała Wojciech, Janczak Damian, Cieślik Marta, Mazurkiewicz Jakub, Pulka Jakub

Journal of Ecological Engineering

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2020

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Vol. 21, nr 4

212--216

EN

In modern agricultural biogas plants, the biowastes are being increasingly used for the biogas production. The food waste is also widely used in larvae breeding. This is an important because, based on biowaste, its proper management and green energy production is possible. This study aims to determine the biogas and methane efficiency of the Hermetia illucens larvae that were fed using the food waste. In the research on the biogas and methane efficiency, the Hermetia illucens larvae were used. The total solids (TS) of the substrate equals 30.35%, and the volatile solids (VS) content was 92.31% of TS. The larvae were fed only with the food waste of plant origin. The obtained substrates were homogeneous. The experiment was carried out under mesophilic anaerobic digestion conditions – 39°C in the 21-chamber biofermentor set in the Institute of Biosystems Engineering in Poznań University of Life Sciences. The anaerobic digestion process in the batch reactor ran correctly. Fermentation inhibition was not detected. The biogas efficiency for larvae amounted to 198.75 m3∙Mg-1 fresh mass (FM). On the other hand,the methane efficiency, amounted to 127.73 m3∙Mg-1, at the methane concentration of 64.27%. On the basis of the research, it was found that the larvae feeding on food waste can be used directly as anaerobic digestion in the bioconversion process.

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Biogazownia nowej generacji w Przybrodzie

Janczak Damian, Mazurkiewicz Jakub

Nowa Energia

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2019

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nr 5/6

69--71

PL

Na tle rynku europejskiego z blisko 20. tysiącami biogazowni, polski rynek prezentuje się nad wyraz skromnie. Łączna liczba instalacji biogazowych, wliczając w to biogazownie na oczyszczalniach ścieków oraz wysypiskach, to niecałe 300 obiektów. Cały rynek biogazowni rolniczych to z kolei nieco ponad 100 instalacji, co stanowi zaledwie 1% liczby biogazowni naszego zachodniego sąsiada. Niemcy dysponują prawie 9500 tego typu instalacjami pracującymi przede wszystkim na kiszonce i gnojowicy oraz średniej mocy poniżej 400 kW.

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A Possibility of Functioning Biogas Plant at a Poultry Farm

Janczak Damian, Mazurkiewicz Jakub, Czekała Wojciech, Myszura Magdalena, Kozłowski Kamil, Jeżowska Aleksandra

Journal of Ecological Engineering

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2019

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Vol. 20, nr 11

225--231

EN

The biogas production constitutes one of renewable energy sources (RES) . In addition, wastes are preferred for energy production. In the case of some wastes, e.g. poultry manure, it is difficult to conduct anaerobic digestion in monofermentation. The aim of this work was to plan the biogas plant, in which the main substrate is the waste from a poultry farm. The scope of work included: preparation of a biogas plant technological project, determining the amount of biogas and methane that can be produced annually on the example of the selected poultry farm, performing the energy and financial calculations for the current conditions prevailing on the renewable energy market in Poland. The installation project assumed the location of a biogas plant at an existing poultry farm – the source of the substrate. The micro-biogas plant includes a fermentation tank with a capacity of 500 m3 and storage of digestate pulp with a capacity of 700 m3. The assumed power biogas plant will generate 112 kW of electricity and 120 kW of heat. The installation will operate in a single-stage mesophilic technology (39 °C), which will avoid incurring additional costs related to heating and the construction of additional fermentation tanks. The use of poultry manure by anaerobic digestion provides benefits through biogas technology. It is necessary to examine the technology in terms of biogas production, which is carried out under better sanitary and environmental conditions. This work was undertaken to investigate the environmentally friendly removal of poultry manure through biogas technology to obtain the best economic effect, and employ it further, e.g. as a fertilizer.