Iron Cyanide Removal from Wastewater via Precipitation

Capabilities

• Can reduce total cyanide levels to approximately less than 1 mg/l
• Converts iron cyanide to land fillable sludge

Description of process

• Wastewater from coke gas contains cyanide after ammonia stripping
• Reducing agent must be added to wastewater stream if complexed iron is ferric
• Ferrous/ferric chloride is added to water to form a ferri-ferrocyanide insoluble particulate
• Additional coagulating metals are added to improve settling of particulate
• Sedimentation followed by sand filtration results in cyanide reduced wastewater
• Anion ion exchange resin removal of cyanide available for "clean streams"