Home > RAPTOR Technology from CST Wastewater Solutions Converts Organic Wastes into Biogas for Green Power

RAPTOR Technology from CST Wastewater Solutions Converts Organic Wastes into Biogas for Green Power

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CST Wastewater Solutions  has launched a new waste treatment system for organic residues that converts almost any organic residue or energy crop into biogas, valuable electricity or heat.  

CST Wastewater Solutions has partnered with Global Water Engineering (GWE) to supply the RAPTOR technology that converts organic wastes into biogas to generate green power.  

RAPTOR or Rapid Treatment of Organic Residues is a powerful liquid-state anaerobic digestion process that consists of enhanced pre-treatment followed by multi-step biological fermentation.  

According to Michael Bambridge, Managing Director of CST Wastewater Solutions, a RAPTOR plant is a total solution that covers everything from handling the energy crop to the production of biogas, green electricity or steam.  

The RAPTOR technology can process a wide range of organic residue types, resulting in an efficient and rapid conversion of the material into agricultural fertiliser and biogas.  

Organic wastes handled by the RAPTOR system: 

  • Food waste including market surplus, kitchen waste, off-specification fruit and vegetables, and excess crops
  • Agro-industry residues such as starch and sugar pulp, vegetable or potato waste
  • Industrial residues such as brewery waste (spent grain), fruit processing waste and paper mill sludge
  • Energy crops such as corn, various grasses and algae

Multiple RAPTOR pre-treatments are available to process diverse organic wastes and enable superior conversion efficiency. These pre-treatments include: 

  • Enzymatic pre-treatment
  • Chemical pre-treatment
  • Thermal pre-treatment
  • Biological pre-treatment
  • Mechanical pre-treatment

Rapid anaerobic digestion  

The pre-treated and blended substrate slurry is transferred into a mixed digester that uses energy-efficient and low maintenance mechanical mixing.  

The digester tank comes in sizes up to 12,000m³. The digester tank is fully insulated, heated by recycling the digester content through a special heat exchanger.  

RAPTOR plants can achieve loading rates up to 10-15kg COD/m³ per day and biogas production rates up to 6.3 Nm³ per digester per day.  

The digestate from the digester is usually treated in a centrifuge for removal and disposal of non-digestible solids in the form of wet sludge cake, which can be used as an agricultural fertiliser. Sludge cake drying and pelletising systems are available for the purpose.  

The liquid concentrate from the digester is added to the fresh solid waste in the slurry-making stage, recycled to a TAR treatment, or ultimately disposed of in a conventional wastewater treatment plant.  

Biogas use  

Biogas generated in the RAPTOR process is desulphurised and partially dried, using GWE’s Sulphurix and Gasodrix systems, and consequently used for green power generation.  

Alternatively, biogas can be used in a steam boiler for steam production, in which case desulphurisation and drying are typically not required.

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