Biogas

EPCON has a specialised product for treatment of biogas reject water from digesters.
Evaporation is proven as a reliable technology for de-watering of reject water. 
Suiker Unie Green Energy (The Netherlands).  Biogas reject water treatment MVR evaporation plant. The unit treats 20 m3/h of reject water and has been in operation since 2012.

EPCON biogas brochure
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"Why choose EPCON MVR evaporation?"

For industrial biogas plants, a solution for processing the digestate is a key to success. As the digestate contains several nutrients such as N, P and K, it can be a valuable fertilizer when delivered to farmers in the correct volume and composition.

EPCON MVR evaporators reduce the volume of the reject by 70-90%. Nutrients are preserved and can be kept in the concentrated stream. It is also possible to have the Nitrogen in a separate phase as ammonia water.
Our proven product for biogas reject water treatment is based on combinations of these technologies:

  • MVR evaporation
  • Acid mixing
  • Stripping
  • Condensate polishing


Some of the benefits of EPCON MVR evaporators :

  • 70-90% of water is removed
  • Concentrate (10-30% TS) can be used as fertilizer
  • Lower distribution and storage costs
  • Control of phosphorus balance
  • Control of ammonia balance in digester
  • Condensate re-use as process water or discharged as surface water
  • Efficient and robust process for dry matter separation
  • Reject water treated at high temperature
  • Low energy consumption
  • Small footprint
  • Proven technology