Evaporation

Description

• Use atmospheric or vacuum evaporation to recover chemicals in wastewater

Advantages

• Concentrates chemicals in baths and rinses
  • May enable recovory and reuse of these chemicals
  • Concentrate them to produce a lesser volume of hazardous waste
• Evaporation in rinse tanks minimizes flow into water treatment systems
• Can allow well designed and operated rinse systems to have zero discharge

Limitations

• Not suitable for concentrated cyanide or chrome solutions
• Temperature limits of process chemicals must be monitored

Implementation Process

• Perform a cost analysis, including:
• reduced chemical loss
• reduced waste generation
• capital investment
• possible permitting fees
• increased energy
• Obtain an air permit, if necessary
• Purchase and install baths heaters, and/or a commercially available evaporator
• Determine the optimal operating conditions (temperature, etc)
• Develop a standard operating procedure to keep operation within an exceptable range around the optimal conditions
• Train employees on necessary monitoring and tracking procedures