The energy that the sun stores in the biomasses, has a huge potential: agricoltural residues and technical plants can partially fix the great crave for energy that modern living creates.
the most immediate way of extracting this energy is certainly the old way: burning.
To dry biomasses below a certain point presents less problems in comparison with other methods.
But, burning for heating poses clear questions about the origins of the fuel we use: even though the CO2 we inject in the atmosphere by burning was allready absorbed by the plants in the first place, other kinds of molecules can be present when the biomasses are derived from water treatment, soil decontamination, sanitary prevention in mining sites. The potentially dangerous chemicals, pesticides, heavy metals cannot be reintroduced in the air; therefore we have to be particularly cautious using biomasses derived from dangerous sites.
Biogas derived from the digestion of vetiver leaves, present other kinds of obstacles: I've noticed in my field work that cut leaves are tough to rot: they dry out and stay on the ground for a long time intact, even though this mulch is perfect, this indicates that the rotting process is slowed down by some substance present in the leaves, exactly what we did not need for biogas.
But Vetiver biomasses, are composed by 45,8% of cellulose, a carbohydrate that can be treated with low heat (about 40°C) and enzymes to produce alcohol with the simultaneous saccarification and fermentation method