mainly Ca2+Na+ from the coagulants, and those from the different algae, for example the Scenedesmus which contain 23–25% of minerals. It can be observed that the sample has a great
amount of calcium of inorganic coagulant, which affects the ash content (Obernberger et al., 2006; Vassilev et al., 2010). Fixed carbon is similar to wood pellets (Roy et al., 2013). Wood pellets have values about 80 wt% (d.b.). If there are coagulants in the sample, an increase of the ash content for inorganic matter and lower calorific power occurs.