A new treatment system for organic residues has been launched by CST Wastewater Solutions, promising to convert 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 system, which stands for Rapid Treatment of Organic Residues. It’s a powerful liquid-state anaerobic digestion process that consists of enhanced pre-treatment followed by multi-step biological fermentation.
“A RAPTOR plant is a total solution, starting with logistics for handling the energy crop and ending with the production of biogas, green electricity or steam,” said CST Wastewater Solutions managing director, Michael Bambridge.
“A wide range of organic residue types can be processed, resulting in an efficient and rapid conversion of the material to agricultural fertiliser and biogas.”
The plant can handle:
• Food waste, such as market surplus, kitchen waste, off specification fruit and vegetables, and excess crops
• Agro-industry residues, like starch and sugar pulps, vegetable or potato waste.
• Industrial residues, such as brewery waste (spent grain), fruit processing waste, and paper mill sludge.
• Energy crops, for example corn (silage), various grasses, algae.
The diversity of the material to be processed means a range of different RAPTOR pre-treatments are available, to allow the highest possible conversion efficiency.
In the RAPTOR process, 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 12,000 m3. Optional extras include a foam breaker fan, a scum buster system and a bottom grit trap.
The digester tank is fully insulated, heated by recycling the digester content through a special heat exchanger.
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