CaF2 Sludge Reuse

[NANCY HELM <HELM.NANCY@epamail.epa.gov>]

I've received the following question regarding the
recycling of wastewater treatment sludge from an
integrated circuit fabrication facility.  My quick
check of the P2TECH archives revealed nothing on
this subject.  Anyone have any ideas on this?  I'd
appreciate it if you could send a copy of your
answer to Chris Warberg at 
<CWarberg@wafertech.com>  He's not a P2TECH
subscriber.  Thanks!
Nancy Helm
EPA Region 10
Seattle, WA

	The second question relates to the disposal of
a calcium fluoride sludge that is produced in the
wastewater treatment process.  Similar sludges
from other semi-conductor facilities in the area
produce this type of sludge and it is not considered
hazardous for their sites.  So, I am not expecting
our sludge to be hazardous either.  However,
instead of simply disposing of this sludge in a
sanitary landfill, I am interested in finding another
industry that uses calcium fluoride as a raw
material.  (We would of course provide detailed
chemical analysis of the sludge.)  I was wondering
if you knew a place I could contact to find out about
industries that use calcium fluoride?