Fos/Tac device is used for healthy monitoring and analysis of microbiology in the fermenter in biogas plants.
Organic acids (FOS) and total inorganic carbon (TAC) provide information about the microbiology of the fermenter in the biogas plant.
An elevated FOS/TAC means a risk of acidification of fermenter effluents.
Checking pH alone is often not enough, so it is important to have a FOS/TAC device.
With the relatively simple FOS/TAC analysis, an incipient acidification can be recognized in time and the risk prevented by taking appropriate countermeasures.
5 g of fermenter filtrate is required for analysis and diluted to 20 g with distilled water. The subsequent titration process is completely automatic. Results for total acid (VOA) are displayed as buffer capacity (TAC) and VOA/TAC value
| FOS/TAC | CONCLUSION | MEANING | ACTION TO BE TAKEN |
|---|---|---|---|
Indigestion Zone |
>0,6 0,5 -0,6 0,4 -0,5 |
The amount of biomass is excessive
The amount of biomass is high
| Stop feeding, start feeding when FOS/TAC approaches 0.5 and allow to decrease with decreasing acceleration until the optimum level.
|
SUITABLE | 0,3 – 0,4 | The amount of biomass is at optimum level | Do not change Biomass Feeding Frequency and Amount |
THE HUNGER ZONE | 0,2 – 0,3 <0,2 | The amount of biomass is seriously too low | Increase the Frequency and Quantity of Biomass Supply |
