Liquid purification or separation – Processes – Chemical treatment
Patent
1999-05-04
2000-08-01
Reifsnyder, David A.
Liquid purification or separation
Processes
Chemical treatment
210766, 210768, 210774, 210806, G02F 172
Patent
active
060962275
ABSTRACT:
A system for treating industrial sludges to recover a hydrocarbon portion and a solid particulate substrate portion. A sludge feedstock is screened to remove large particles and is diluted to between about 5% and about 50% solids to form a slurry. The slurry is agitated and heated to 180.degree. F. or higher for a time sufficient to melt waxy hydrocarbon solids, reduce the viscosity of the slurry, reduce the density of hydrocarbons within the slurry, and break surface adhesion of hydrocarbon compounds to substrate particles. In a first separation step, the substrate particles are separated from a first liquid effluent containing most of the hydrocarbons from the original sludge, which may be further processed for recycle use. A first residual substrate cake is redispersed in hot water to form a second slurry and is treated with an amount of hydrogen peroxide for a time sufficient to lyse and/or liberate residual hydrocarbon compounds and to oxidize toxic polycyclic aromatic hydrocarbons to non-toxic derivatives. The second slurry is passed through a second separation step, yielding a second liquid effluent which may be combined with the first liquid effluent for recovery processing of the hydrocarbons. The second residual substrate cake may be disposed of, as by landfilling, or further processed to recover valuable material in the substrate.
REFERENCES:
patent: 4861497 (1989-08-01), Welch et al.
patent: 5762809 (1998-07-01), Luft et al.
patent: 5797701 (1998-08-01), Conaway
patent: 5928522 (1999-07-01), Conoway
Continuum Environmental, Inc.
Reifsnyder David A.
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