Biomass / Waste Management

The Electrotechnical Materials and Environmental Technologies Center has studied and designed an equipment for biomass energy recovery biogas, during an anaerobic fermentation process.

The project was developed in order to apply some new concepts and metanogenic fermentation systems, suitable for projecting new equipment, exhibiting optimal power yields and investment costs, capable of generating unconventional, renewable energy.

Whey is a residual product of the milk industry and represents an optimal raw material for biogas generation, during metanogenic anaerobic fermentation. All the necessary analyses were performed and it was concluded that whey complies  with all the necessary conditions for developing the bacterial environment, mandatory for carrying on the anaerobic digestion.

The anaerobic digestion is a complex biological process developed in the absence of oxygen, that transforms the organic substance into biogas (or biological gas), composed especially from methane and carbonic anhydride. The methane percentage varies from 50% to 80%, depending on the type of digested organic substance and on the conditions of the process.

Thus, a new fermentation process was designed, known as “HORIZONTAL FLUX”, having the following features:

  • The biogas removal is simultaneously performed on the entire substrate due to the existence of the horizontal path having a thickness that does not exceed 3.5 meters
  • The age of the digested material is equal to the retention hydraulic time being at least double in comparison with that in the case of the traditional systems, thus ensuring a complete exploitation of the raw material
  • The hydraulic piston effect ensures the advancement of the material inside the digester
  • Ensures a periodical homogeneous behavior, on the vertical axis, of the substrate through pneumatically stirring process developed through a fixed quantity of re-circulated biogas and its pressing with an air-blower
  • The separation of the acidogenesis and metanogenesis phases, allowing an improved pH value for each microbial population that is involved in the biogas production, thus ensuring a maximum biological yield
  • The total destruction of the pathogenic microorganisms existing in the raw material, thus leading to the elimination of the digested material sterilization , prior to its usage as an agricultural fertilizer
  • The construction of the digester at smaller volumes, reduced to the necessary ones for performing the release of the generated biogas having decisive benefits on the investment costs
  • The possibility of the partial recovery of the thermal energy from the evacuated digested material, for pre-heating the new introduced material during a process that does not imply a supplementary power consumption
  • The possibility of reducing the hydrogen sulfide content by sequential disruptions, ensured by the substrate stirring through bubbling

The research activities developed during this project enable the implementation of newer concepts and metanogenic fermentation systems suitable for creating equipment, exhibiting optimal power yields and investment costs , for the generation of the  unconventional, renewable energy.


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