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CST Wastewater Solutions announces RAPTOR organic residue treatment systems

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RAPTOR technology is the foundation of a new range of organic residue treatment systems launched by CST Wastewater Solutions , which can convert almost any organic residue or energy crop into biogas, electricity or heat.

The company has partnered with Global Water Engineering (GWE) to supply the RAPTOR system. RAPTOR stands for Rapid Treatment of Organic Residues, and represents a powerful liquid state anaerobic digestion process that consists of enhanced pre-treatment followed by multi-step biological fermentation.

RAPTOR organic residue treatment systems can handle:

  • food waste
  • agro-industry residues
  • industrial residues; and
  • energy crops.
Due to the wide variety of material that can be processed by these systems, a range of different RAPTOR pre-treatments can be adopted to ensure the highest possible conversion efficiency.

These pre-treatments include:

  • enzymatic
  • chemical
  • thermal
  • biological; and
  • mechanical pre-treatment.
Once material has been pre-treated in a RAPTOR system, the blended substrate slurry is transferred into a mixed digester that uses energy efficient and low maintenance mechanical mixing.

Digester tanks can be supplied in sizes up to 12,000 m³, with optional extras including a foam breaker fan, scum buster system and a bottom grit trap available on request.

The digester tank is fully insulated, heated by recycling the digester content through a special heat exchanger.

Digestate produced by the digester is typically treated in a centrifuge for removal and disposal of non-digestible solids in the form of wet sludge cake, which is ideal for use as an agricultural fertiliser. Sludge cake drying and pelletising systems are also available.

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

Depending on the nature of the substrate, RAPTOR organic residue treatment systems can achieve loading rates of up to 10-15 kg COD/m³ per day, and biogas production rates of up to 6.3 Nm³ per digester per day.

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, the biogas can be used in a steam boiler for steam production. In this case, desulphurisation and drying are typically not needed.

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