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Paint Booth Filters


I'm looking for your comments/interpretation of this specific issue. Here's
the scenario.

A large coating facility paints with both liquid and powder coating. It
holds a major source air permit and is in compliance with all air regulations.

When the company changes filters in the liquid spray booth it drys the
filters in an oven then disposes of the filters in landfill.  The dry
filters are a nonhazardous waste as proven by TCLP testing.

Is the company doing unauthorized treatment of the paint booth filters?

Second part for those of you who consult with or provide technical
assistance to industry.

Is the scenario described above the most common method of dealing with spent
paint booth filters you have observed in facilities that have an air permit
which accounts for the emissions from the spent paint booth filters?

Lastly, if the filters were dry to the touch but not baked dry,  when
removed from the liquid spray booth, is there a way to determine if
spontaneous combustion is likely to occur in the waste storage container?

Any comments are greatly appreciated and yes the company is moving as
rapidly as possible to powder coating. It is also using low VOC high solids
liquid coatings. The company is very progressive but has this one small
problem, it wants to keep the customers that it liquid spray coats for.


Jack Annis, MBA, CEA
Industrial Recycling and Waste Reduction Specialist
Solid and Hazardous Waste Education Center
UW-Green Bay   Phone: 920-465-2940  Fax: 920-465-2143
UWM-CCE Milwaukee 414-227-3371  Fax 414-227-3165
email:   pannis@facstaff.wisc.edu