Electroplating and metal finishing industries generate wastewater containing toxic heavy metals. Learn about effective treatment technologies for chrome plating wastewater.

Heavy Metal Contaminants

• Hexavalent chromium (Cr6+): Highly toxic, carcinogenic
• Trivalent chromium (Cr3+): Less toxic, common in bath
• Nickel (Ni): Toxic, expensive to recover
• Copper (Cu): Moderate toxicity
• Zinc (Zn): Environmental concern

Treatment Technologies

Chemical Precipitation

• pH adjustment for metal hydroxides
• Ferric chloride for phosphorus
• Optimized dosing for minimum sludge

Chrome Reduction

• Reduce Cr6+ to Cr3+ using sodium metabisulfite
• Then precipitate Cr3+ as hydroxide
• Optimal pH: 8.5-9.0

Ion Exchange

• Selective removal of specific metals
• Nickel recovery for bath reuse
• Chromium recovery

Compliance Standards

Typical discharge limits:

• Total Cr: 0.5-2 mg/L
• Cr6+: 0.1-0.5 mg/L
• Ni: 0.5-1 mg/L
• Cu: 0.5-2 mg/L

Metal finishing wastewater solutions? Contact us for custom treatment systems.

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