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metallic wastes recycling & treating

> The TRI data from 1991-1995 indicate very large increases in the
> amount of metallic wastes recycled and treated.  Does anyone know if
> this was spurred by a particular regulatory action (e.g., regulation
> of metal-bearing POTW discharges)? Alternatively, have there been any
> recent technological innovations in metals recovery or recycling that
> may have contributed to this trend?   
Thanks for any insights you can provide. 

> Brian C. Murray, Ph.D.
> Senior Economist
> Center for Economics Research
> Research Triangle Institute
> Phone: 919-541-6468
> Fax: 919-541-6683
> Email: bcm@rti.org