Some wastes that are produced from the agro-alimentary industry, because of their organic lead and their high humidity content, are appropriate for the treat­ment, through anaerobic digestion (par. 2.1, Chapter 4). The main agro-alimentary industry wastes that can be applied to energy recovery through bio-methane, with a specific production of bio-gas between 0.25 and 0.35 m3/kg ds, are:

• the dairy sector wastes: serum, main cheese working waste with a high organic load; serum can be evaluated from the energy point of view through the anaero­bic digestion bio-gas production (in co-digestion with other substrates to avoid an excessive acidification);

• the compartment wastes from butchering (deriving from the meat production effluents for human feed, show high organic loads due to the presence of blood, fat and dung material, in addition to dejections);

• the working and fish conserving wastes;

• beverage industry wastes (particularly the high organic load coming from fruit juice, beer and distillates load wastes);

• the sacchariferous industry wastes (particularly coming from the molasses working which show effluents with a high organic substance content).