Dry fermentation is a method of biological waste utilisation in which organic waste such as garden waste, green waste or liquid manure is fermented without the addition of water.

This process takes place under low-oxygen and anaerobic conditions - the microorganisms responsible for fermentation do not require oxygen.

The result of dry fermentation is a stabilised product that can be used as a fertiliser. The process produces fewer methane emissions compared to wet fermentation.

Dry fermentation is particularly suitable for processing large quantities of dry, seasonal green waste, as no additional water is required and the amount of methane emissions is reduced.

There is also the hybrid variant of "semi-dry fermentation", which requires less water. It is still less susceptible to problems with pathogenic microorganisms and produces fewer emissions than pure wet fermentation.