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Efekt badań statutowych
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Finansowanie:
This research was partially financed by the National Science Centre Poland grant number 2019/35/D/NZ9/01835. The authors wish to thank Aleksandra Szaja for her help in calculating kinetic parameters.
Zophobas morio is one of the most widely bred insect species in commercial farms around the world, however Z. morio post-breeding waste has never been tested for its biogas and biomethane potential. The unseparated waste (M) was sieved to separate it into fractions of feces (F) and remaining wheat bran (W) in order to investigate whether isolated feces can have higher biomethane potential. Mesophilic (37 °C ± 1 °C) anaerobic digestion was performed in glass bioreactors (2 l total volume) for 24 days. The substrate loading was 8 g of the air-dried sample and the inoculum-to-substrate total mass was 125:1. The physicochemical parameters of the wastes and sludges after fermentation were investigated. The biogas potential of the feces was only approximately 3% higher than other tested materials and reached 650 ml of biogas · g−1VS. The average methane concentration was 52% (vol.). The calculation of theoretical electric and heat energy recovery in a co-generation system reached (per 1 Mg of waste VS) 1.3–1.4 MWh and 1.4–1.5 MWh, respectively. Post-breeding waste from Z. morio can be successfully used for energy recovery in the form of biogas.
