Dry fermentation technology is a good alternative to an enlarged and more well-known wet fermentation. It is especially suitable for farms, businesses involved in the waste management sector and municipalities. These subjects does currenty have to decite how to deal wiht bio-wasre which is a problem for them. Instead of expensive liquidation of this waste through the use of dry fermentation it can brings economic benefits. Biowaste, which was a problem becomes a precious commodity.

 

Dry fermentation technology is simpler than the wet version. The fermenters are characterized  by having a generally common shape of the building. They are filled and unloaded using the front loader. Dry fermentation is a discontinuous process in which is the material in the fermentation boxes heated to operating temperature and  spraying by the processing liquid. There is a depletion of oxygen in a short time and start on the process of anaerobic fermentation and biogas production in fermenters. The material remains approximately 4-5 weeks in the process. After this period biogas production is decreasing and the material is removed. The residual material can be used as valuable organic fertilizer or can be further composted. Produced biogas is burned in a cogeneration unit which produces electricity and heat.

The advantages of dry fermentation:

  • the possibility to work with a material with a higher dry matter content than the wet fermentation,
  • the possibility of processing non-homogeneous material with lower quality and containing different additives without pretreatment (technology suitable for energy recovery from biowaste),
  • lower demands for the necessary mechanization compared to wet fermentation (no mixers, pumps),
  • less energy consumption devices to operate,
  • the possibility of additional expansion of biogas plant,
  • production of quality organic fertilizer.
Hore