Method for recovering a wood preservative from waste sludges

Details Method for recovering a wood preservative from waste sludges Method for recovering a wood preservative from waste sludges

1986-03-17

1987-05-19

Wyse, Tom

Liquid purification or separation

Processes

Separating

210773, 210774, 210790, 210806, 162 16, 162189, C02F 1112

Patent

active

046666125

ABSTRACT:
The present invention provides a method for the recovery of a wood preservative chemical from aqueous waste sludges containing said wood preservative chemical in both its liquid and solid phases. The method comprises treating said aqueous waste sludges to effect an initial separation and recovery of the liquid and solid phases, individually. The recovered liquid phase comprises the first liquid phase product stream. The recovered solid phase then is subjected to elevated temperatures sufficient to liquefy the solid phase, said liquefied solid phase comprising the second liquid phase product stream. During the liquefaction of the recovered solid phase, it may be contacted with a quantity of a fresh wood preservative chemical, a portion of a dehydrated first liquid phase product stream or a portion of a dehydrated second liquid phase product stream to prevent the precipitation of any normally solid constituents therein and to enhance the liquefaction of said recovered solid phase.

REFERENCES:
patent: 3830688 (1974-08-01), Mannbro
patent: 3876497 (1975-04-01), Hoffman
patent: 3929586 (1975-12-01), Slikkers, Jr.
patent: 4155804 (1979-05-01), Edge, Jr.
patent: 4237618 (1980-12-01), Moffet
patent: 4402834 (1983-09-01), Bastgen et al.
patent: 4481072 (1984-11-01), Grudinin et al.
patent: 4525278 (1985-06-01), Frost, III
patent: 4578253 (1986-03-01), Gill et al.
Kirk-Othmer, Encyclopedia of Chemical Technology vol. 19, pp. 554-564, 2d (1969).

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