Biogas substrates

thumb|right|250px|Pomace in a bladder press. These are [[Chardonnay grapes left over after pressing.]]

solid block remaining after pressing to extract liquids

Waste that can naturally decompose, such as food scraps, peels, or fallen leaves.

nothospecies of plant, Sudan grass

Mangelwurzel or mangold wurzel (from German Mangel/Mangold, "chard" and Wurzel, "root"), also called mangold, mangel beet, field beet, fodder beet and (archaic) root of scarcity, is a cultivated root vegetable. It is a variety of Beta vulgaris, the same species that also contains the red beet (beetroot) and sugar beet varieties. The cultivar group is named Crassa Group. Their large white, yellow or orange-yellow swollen roots were developed in the 18th century as a fodder crop for feeding livestock.

animal waste thinned with water and used as fertilizer

by-product of sewage treatment

By-product from the Kraft process for making paper pulp

byproduct of beet processing used as fodder for livestock