Biogas Plants Generated Wastewater Treatment With Application Of The Gacs Method Of Zeologic S.A.


General Information
Biogas plants operation is based anaerobic digestion in air tight reactors which transforms biomass waste into biogas aiming at generating electricity. Some indicative raw materials used for this process are: plant silage, cattle manure, sludge occurring from beer process, whey cheese, olive mill leftovers etc. From digestion procedure, except of biogas, an amount of digestate biomass is produced which consists of solid and liquid residue. According to existing legislation, solid residue has to be stored and disposed in a form which complies with all relative environmental terms of the existing legislation (having the characteristics of soil improver). The liquid residue, the characteristics of which are determined from its raw materials can recirculated in the bioreactor or disposed with safety to the environment, after treatment under certain specifications.
The GACS Solution (Geochemical Active Clay Sediment)
The Geochemical Method GACS consists an innovative solution on an international level on the subject of treatment and disposal of wastewater produced from biogas reactors among others. A major advantage of this method, is the competitive speed of needed process, which results in no longer requiring the build – up of soil tanks that are necessary for the waste to remain. The key characteristic of the Geochemical Method GACS is the usage of geopolymer materials, which have the ability to adapt on the characteristics and particularity of any type of waste, thus ensuring a successful treatment with warranty of optimal performance.
Benefits of the GACS Method, on treatment of biogas plants wastewater against the conventional existing methods can be summarized in the following:
Financial Benefits:
  • Recirculation of treated liquid in the bioreactor
  • Competitive investment cost
  • Significant reduced operational cost
  • Reduced maintenance cost
  • Reduced sludge production
  • Reduced operational time

Environmental Benefits:
  • Ability of implementation even in high proportions of pollutant raw materials
  • Ability of optimizing the bioreactor’s energy efficiency
  • Heavy metals removal even on high concentrations
  • Effluent complying with legislation
  • Production of inert sludge
  • Use of natural materials
  • Odor removal