2.3.1. Proximate Analysis

The evaluation of the drying process was carried out according to the norm ISO 18134-2:2017 [39]. The process took place in oven drying conditions under controlled temperature (105 ± 2) ◦C. In order to avoid the loss of volatile compounds, the drying process did not exceed 24 h. Ash content and volatile compounds were determined according to the norms ISO 18122:2015 [40] and ISO 18123:2015 [41], respectively.

### 2.3.2. Determination of Gross Calorific Value and Elemental Composition Analysis

Gross calorific values (CGV) of samples were analyzed using a LECO AC500 Automatic Calorimeter, based on norm ISO 18125:2017 [42]. Carbon (C), Hydrogen (H) and Nitrogen (N) determinations were carried out according to norm ISO 16948:2015 [43].
