Plūme, Imants; Dubrovskis, Vilis; Plūme, Benita
July 2012
Proceedings of the International Scientific Conference on Renewa;2012, p139
Conference Proceeding
Greenhouse gas (GHG) emissions have been evaluated for usage of maize, natural grasses, perennial legumes lupine and galega for biogas production in cogeneration a unit with electric power of 500 kW in a 20 years period. The area for biomass supply to the cogeneration plant varied from 314 ha for maize to 2 219 ha for natural grasses growing without fertilization. The type of biomass strongly influences GHG emissions because of the different number of treatments needed for energy crop growing, transportation distances, fertilization needs and various levels of carbon capture into the soil. It was found that maize biomass usage for energy production caused the highest GHG emissions 24 gCO2eq MJ-1 which can be explained by high number of treatments and increased mineral fertilizer doses needed for intensive growing of biomass. The usage of perennial galega and lupine resulted in negative emissions because of the ability of legumes to provide self-supply with nitrogen and to capture carbon into the soil. GHG emissions per unit of area in a year are varying from -0.92 tCO2eq ha-1 for galega usage to 1.55 tCO2eq ha-1 for maize usage for biogas production.


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