Q, R, S, T, U, V, W, X, Y, Z

Collective term for biomass used for materials and energy (not feed and food). This usually refers to raw materials produced by agriculture and forestry, such as wood, flax, rapeseed, sugars and starch from beet, potatoes or maize, which after processing are used for further material or energy purposes.

Process for introducing non-pumpable substrates or substrate mixtures directly into the fermenter.

Colourless, pungent-smelling gas produced when sulphur is burnt or sulphides are roasted. Its aqueous solution is sulphurous acid (H₂SO₃).

Organic and biodegradable material intended for fermentation with the aim of biogas production.