Abstract

BRAVO AMARANTE, Edevy et al. Emergy analysis the management of rice straw for energy purposes. Universidad y Sociedad [online]. 2021, vol.13, n.6, pp. 404-420.  Epub Dec 10, 2021. ISSN 2218-3620.

The management of crop residues in Cuba has made significant progress; however, it still does not consider the energy potential. In this paper, four alternatives of rice production are evaluated: 1) the basic scenario that is currently used; 2) the production of electricity from the anaerobic digestion of rice straw is delivered to the national electric power system; 3) the electric energy self-sufficiency; and 4) the replace 60% of the diesel fuel by biomethane. Emergy analysis was carried out, which the following indices: the environmental loading ratio (ELR), emergy yield ratio (EYR), emergy investment ratio (EIR), emergy exchange ratio (EER), and the emergy sustainability index (ESI). The values ESI = (6.46, 14.05, 15.67, 24.38) shows that the energy use of rice straw is sustainable in the long term.

Keywords : Waste; rice straw; biogas; emergy; sustainability.

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