A unique feature in Xergi’s biogas plants is the Indirect Feeding System. It is based on a combined feeding, heating and mixing module. The system has a number of benefits compared to traditional biomass intake systems.

Provides flexibility Ensures better digestion Gives high degree of process control Makes servicing of heating system easier Prevents foaming in digester Prevents air from entering digester

Flexibility
The market for biomass can change from time to time, and being flexible regarding biomass types becomes important for profitability. An Xergi feeding module provides just that. Due to the precise feeding of the biomass mix, the biological balance in the primary digester is kept at its most efficient level. This flexibility provides a robust foundation for the investment in your biogas plant.

Furthermore, the module allows for pasteurization of the biomass making it possible to process category 3 by-products.

Better digestion
Because the biomass is heated and mixed before entering the digester a homogenous consistency is achieved providing a more efficient digestion process, and a higher gas yield.

High degree of process control
As the feeding module sits on a scale the biomass is accurately weighed. This makes it easy to manage the use of particular high-energy biomasses, which can disturb the biological process if not dosed correctly.

Servicing of heating system is easier
The biomass is heated in the feeding module, eliminating a need for a heating system in the primary digester. This gives an advantage of not having to empty the primary digester for maintenance, which prevents lost production.

Foaming in digester is prevented
As a result of the pre-heating of biomass protein structures are broken down in the feeding module before entering the digester. This prevents foaming, which can be a frustrating operational problem.

Prevents air from entering digester
With an indirect feeding system, air is prevented from entering into the primary digester, thus avoiding the bacteria being affected by oxygen and therefore maintaining production efficiency.