Grape cake
Grape cake (a dried marc) after extraction of the pits may also be used as a biofuel. It has a moisture of about 10%, ash content is higher than in the grape pit flour – about 7%. NCV is about 16,6 GJ per mt. Sulphur content is abt 0,26-0,3%. Oil content is about 2%. This material may be compared with olive cake.