Liquid purification or separation – Recirculation – Serially connected distinct treating or storage units
Reexamination Certificate
2005-10-27
2009-02-24
Hruskoci, Peter A. (Department: 1797)
Liquid purification or separation
Recirculation
Serially connected distinct treating or storage units
C210S194000, C210S202000, C210S241000
Reexamination Certificate
active
07494586
ABSTRACT:
Solid and liquid concrete waste is collected from a construction site and safely off-loaded at a treatment site. Solid waste is separated and sent to a crusher to be made into road bed aggregate. Liquid waste is put in a first tank to settle the solids, then moved to a second tank to settle remaining fine solids, and moved to a third tank coupled to a circulation pump with CO2gas injection to lower the pH. The liquid in the third tank is then filtered before discharging for recycle, irrigation or dust control. A precipitate agent is preferable added to the liquid in the third tank to remove heavy metals and the precipitate is periodically backwashed from the filter into the first tank. The sludge created in the settling and filtering process is periodically dewatered in the first tank and mixed with the solid concrete waste sent to the crusher.
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Yelton, Rick, Treating Process Water, Publication #J970441, The Concrete Producer, Jun. 1997.
Engelsgaard Roger
Mickelson Kevin
Concrete Washout Systems, Inc.
Hruskoci Peter A.
O'Banion John P.
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