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Aluminum Oxide Slurrey

I am working with a magnetic disc refinisher who acid strips the magnetic
coating and subsequently polishes the surface with an aluminum oxide slurrey. 
He currently pretreats this waste, discharges the water to the local POTW and
ships the sludge offsite. Does anyone know of a technology that is currently
in use to recover and reuse slurrey from magnetic disc polishing operations?

Isao Kobashi
Santa Clara County P2 Program