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RE: Paint Booth Filters
I don't believe that filter baking would be classified as treatment but you
never can tell. It depends on how the ruling agency sees it. Since you are
not adding anything to render the waste non-hazardous, some might accept it.
On the other hand, some say treatment consists of anything you do to render
the waste less hazardous.
Regarding your second point, baking filters to render them inert is
typically not allowed in areas with strong air pollution control
requirements. I don't know if it still holds, but the South Coast AQMD
required wet filters to be placed into sealed drums. It didn't matter if
the emissions were covered under permit, you were not allowed to emit VOC if
there was an easy way to avoid release. To eliminate the potential for
filter fires, wet filters were placed into drums filled with water.
Semi-dry filters may catch fire depending on the types of paint employed.
It has to do with how fast the oil-base oxidizes with air and the type and
amount of solvent present. Naturally derived oils such as linseed oil are
the most troublesome. Filter booth fires were quite common at one time when
there was much greater use of these oils. You may be able to test the
filters by placing them in an insulated container and measuring the increase
in temperature over time. I recall there was an ASTM procedure for this
test but I don't know if it is still in use.
Hope this helps,
> From: Jack Annis[SMTP:email@example.com]
> Reply To: Jack Annis
> Sent: Friday, March 27, 1998 7:09 AM
> To: firstname.lastname@example.org
> Subject: Paint Booth Filters
> I'm looking for your comments/interpretation of this specific issue.
> 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
> 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
> paint booth filters you have observed in facilities that have an air
> 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
> 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: email@example.com