The FOS/TAC ratio is an important indicator to monitor in the field of methanization. It allows to evaluate the biological balance of an anaerobic digester, which is a biological reactor used for the production of biogas from organic matter.
The FOS/TAC ratio refers to the relationship between the amount of readily fermentable organic matter (FOS) and the amount of volatile fatty acids (VFAs) produced during anaerobic fermentation of organic matter. The FOS/TAC ratio is important because it helps assess whether the digester is in biological equilibrium. An adequate FOS/TAC ratio indicates that the amount of readily fermentable organic matter is sufficient to maintain the bacterial population required for biogas production.
If the FOS/TAC ratio is too low, it means that there is insufficient fermentable organic matter in the digester, which can lead to a decrease in biogas production. Conversely, if the FOS/TAC ratio is too high, it may indicate a build-up of volatile fatty acids, which can lead to acidification of the digester and a decrease in biogas production.
Monitoring the FOS/TAC ratio is important to ensure optimal digester operation and maximize biogas production.