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Foundry Wastewater slude

I was contacted by a foundry operation that uses a wet dust collection system (water scrubber).  The sludge is stored in a lagoon and de-watered.  The sludge consists of:

4-10% sand/based on grain size
rest is silt & clay
30-40% moisture
SPLP test yield acid content as weak as rain water
operation products 190,000 tons of sludge each year.

Is there a company and/or process that can use this product (preferably in IN, OH or MI).  Perhaps as flowable fill?  Concrete additive?

Any ideas, comments or suggestions

Thank you in advance,

David A. Foulkes, Environmental Specialist
State of Ohio EPA
Office of Pollution Prevention
P.O. Box 1049
Columbus, OH  43216-1049
(614) 644-3118
email:  dave.foulkes@epa.state.oh.us
World Wide Web:  http://www.epa.state.oh.us/opp