Abstract
One of the anaerobic digestion process products in an agricultural biogas plant is digestate (digested pulp). Large quantities of digestate generated in the process of biogas production all over the world require proper management. Fertilization is the main management of this substrate, so it is essential to look for new alternatives. The work aims to determine and discuss the possibilities of using digestate solid fraction (DSF) for pellets as biofuel production. Pellets from DSF alone and pellets with sawdust, grain straw additives were analyzed. The lower heating value (LHV) based on the dry matter for all analyzed pellets ranged from 19,164 kJ∙kg−1 to 19,879 kJ∙kg−1. The ash content was similar for all four samples and ranged from 3.62% to 5.23%. This value is relatively high, which is related to the degree of fermentation in the anaerobic digestion process. The results showed that the DSF substrate after the anaerobic digestion process still has energy potential. Analyzing those results, it seems that DSF can be a highly valuable substrate for solid biofuels production.
Highlights
The depletion of fossil fuels is one of the main reasons for interest in renewable energy sources [1,2]
One of the renewable energy sources are biofuels produced from biomass [4,5]
Environmental protection is a related aspect of biofuels production and use
Summary
The depletion of fossil fuels is one of the main reasons for interest in renewable energy sources [1,2]. The second most important factor is the legal regulations related to environmental protection [3]. One of the renewable energy sources are biofuels produced from biomass [4,5]. Depending on the physical state of the final product, it is possible to distinguish solid [6,7], liquid [8], and gaseous biofuels [9,10]. One of the gaseous fuels is biogas, a mixture of gases produced by anaerobic digestion of biomass and organic waste [11,12]. Its main component is methane, which is a combustible gas [13,14]
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