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FW: Recycling ideas for perchloroethylene?



If they must use Perc or another halogenated solvent, the facility can 
save themselves alot of recycling if they do a pre-clean with an 
aqueous cleaner prior to vapor degreasing.  This will keep most of the 
"dirt" out of the vapor degreaser reducing the frequency of emptying 
the degreaser.

In addition to the problems with recycling Perc, does the company know 
they must comply with the Halogenated Solvent Cleaner NESHAP?  This 
could be a major cost (depending on their existing equipment and 
usage) and might justify spending the money for an alternative 
cleaning system.

We make jet engines and have gone almost exclusively to aqueous 
cleaners.  We use "power washers" primarily and have good results.  I 
would suggest that the facility talk to their customer or the 
manufacturer of the parts they are cleaning and find out what they do 
to clean the parts during manufacturing.  They almost definitely have 
to do the same inspections prior to assembly of their product.

----------
From: 	Bill Quinn[SMTP:quinn.bill@ev.state.az.us]
Sent: 	Wednesday, April 08, 1998 4:39 PM
To: 	p2tech@great-lakes.net
Subject: 	Recycling ideas for perchloroethylene?

Perchloroethylene in aircraft parts cleaning:

An aircraft part inspection facility switched from
TCA to perchloroethylene because perk is not a
HAP (does not deplete ozone).  They had tried to
find aqueous solvent substitutes but they do not
do the job well enough.  They did look into new dry
solvent products but the cost was outrageous
$3500.00 and way too expensive for them.  The
facility had researched a variety of aqueous type
cleaners but found none that worked.  They have
invested money in systems that have not cleaned
the parts to specification.  They will continue to
look for a solution but Perk is a stop gap measure
for now.

What do they use Perc for?
They use Perc to clean aircraft parts for
inspection.  They need to make sure the parts do
not have any cracks.  The parts usually have oil or
wax on them.   They inspect the parts for cracks
and it is very important that the parts are throughly
cleaned. They cannot take any chances that they
will miss a crack by not having the part thoroughly
cleaned.  They are responsible for the safety of
the aircrafts.

How do they use the Perc?
Perc is used in a hot vapor degreaser application,
chilled freeboard, 110 gallon capacity.  At 60 days
they add about 30 gallons of Perk.  Estimated at
90 days they will have to dump 110 gallons
because it will become too dirty.  Every 3 months
they would like to send out for recycling.    Some
metal chips (aluminum) will be in the cleaning
solution. 55 gallon drum cost about $300.
$500.00 estimated cost of disposal of 110 gallons.

What are they looking for?
1.  Information on recycling Perc.  Looking for an
economical way to recycle Perc.  What types of
systems are available?  They do not want to
dispose of it and would like some information on
how to recycle it, perhaps closed loop recycling
system.  (They do have a 5 gallon still but it is slow
and labor intensive.)

and/ or

2.  Looking for someone to take used Perk off
hands (exchange or reuse).
also,

3.  Any suggestions on a replacement.

Any information in this regard would be most
appreciated.

Bill Quinn
Az DEQ
Pollution Prevention Unit
Phoenix, AZ



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