logo France | logo UK

Homepage | Organic waste | Anaerobic digestion | Biogas | Biogas installations | Economy of biogas installations |
 Biogas incomes | Sludge | Key to success for a biogas project Contact

Biogas Installations

Some technical elements of biogas plants

hygenisation pit
Hygenisation pit
Special pretreatments are applied to canteen waste or slaughter-house waste to
eliminate the disease-causing agents
The endless screws in the hoppers are used in order to transport waste in the tanks.
Several techniques of solid waste introduction are possible:
  • Piston
  • Mix with liquid waste then pumping
endless screw
Endless screw

Completely Stirred Tank Reactor biogas technology

biogas pipes
Biogas pipes
digester diagram
Digester diagram
blade agitator
Blade agitator
The digester is a concrete or steel tank which can be buried or not. It is hermetically closed,  heated at 40 degrees so that anaerobic digestion take place in optimal conditions.

The most commonly used technique is the one called  “completely stirred tank reactor”

The mixture inside the tank is maintained
homogeneous thanks to a mixing which has several functions: avoiding formation of the crust on the surface, avoiding sedimentation of the matters, facilitating degasification.

In addition to the digester there can be a maturation tank which makes it possible to to stabilize the anaerobic digestion process and to recover approximately 10% additional biogas

Completely Stirred Installations 2 

blade agitator
Agitators with blades
Dry matter percentage : 15% 
biogas plant


Contact Top
2009 Naskeo Environnement