Instrumentation Division Printed Circuit Board Process Assessment and P2

1
Instrumentation Division Printed Circuit Board
Process Assessment and P2

• Melvin Van Essendelft
• Environmental Compliance Representative
• August 19 20, 2008

A circular circuit board made for the
silicon vertex telescope at the NA45 experiment
at CERN. The board houses 24 monolithic
circuits that amplifies the signals from the
silicon detector mounted in the center.
2
Basic Process Assessment Steps
Ron and Howard inspect a sheet of core material
to be laminated into a multi-layer printed
circuit board.
3
Process Flow Diagram Detail
4
P2 Evaluation In Process Assessments
5
Assessment, Prevention and Control Measures
6
PC Board Pollution Prevention Initiatives

• Elimination of Lead in printed circuit board
  fabrication
• Routine chemistry analysis to reduce the
  change-out of plating baths
• Solvent-free aqueous coatings other than solder
  mask legend screening
• Installation of a closed loop ion exchange
  recycle system in the printed circuit board shop,
  to eliminate a source of copper to the STP
  (Planned)

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Lead Free P.C. Board Fabrication

• Elimination of lead and minimization of wastes in
  the following process steps
• Solder Plating Bath
• Anode filter bags, cartridge filters
• Anodes
• Waste-water
• Resist striper bath
• Etch Process
• Etchant
• Filter cleaning waste
• Waste-water
• Solder reflow
• Brushes, lead contaminated debris
• Solder flux air emissions
• Waste-water
• Final Fabrication
• Routing dust
• Scrap boards

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Closed Loop Ion Exchange System P2 Benefits

• Eliminate wastewater containing copper to the
  Sewage Treatment Plant
• Potentially eliminate SPDES violations at the
  Sewage Treatment Plant
• Eliminate photographic rinse water effluent
• Reduce Instrumentation Division water consumption
  by 15,000 gallons per month

9
Closed Loop Ion Exchange System ROI

• Total Project Cost 49,750.00
• Annual Cost Savings 25,000.00
• Payback Period 2 years

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Waste Minimization of P2 Initiatives
One industrial drum of waste due to tank
clean-out ( every 3 years)