Mining operations generate acidic wastewater with high metal content. Learn about effective treatment solutions for acid mine drainage and mineral processing wastewater.

Mining Wastewater Characteristics

• Low pH: 2-6 typical, can be below 2
• High metals: Fe, Al, Mn, Zn, Cu, Pb, As
• High sulfates: 1000-10000 mg/L
• High TSS: Suspended solids and precipitates

Treatment Objectives

• pH adjustment to neutral (6.5-9.0)
• Heavy metal removal to meet discharge limits
• Sulfate reduction where required
• Sludge dewatering and disposal

Treatment Technologies

Chemical Precipitation

• Lime (CaO) or limestone for pH adjustment
• Hydroxide precipitation of metals
• Sequential precipitation for optimal removal

Active Treatment

• Slurry bubble column reactor (SBCR)
• Anoxic/anaerobic limestone drains
• Composting wetlands

Passive Treatment

• Anoxic limestone drains (ALD)
• Successional alkalinity producing systems (SAPS)
• Constructed wetlands

Sludge Management

• Thickening and dewatering
• Geotechnical disposal
• Potential metal recovery from sludge

Mining wastewater solutions? Contact us for site-specific treatment systems.

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