Method for removing dissolved solids from aqueous waste streams

Details Method for removing dissolved solids from aqueous waste streams Method for removing dissolved solids from aqueous waste streams

2008-05-29

2011-11-08

Johnson, Edward (Department: 1736)

Chemistry: physical processes

Physical processes

Crystallization

C588S405000, C588S410000

Reexamination Certificate

active

08052763

ABSTRACT:
A method for removing dissolved solids from a waste stream, such as that produced in flue gas scrubbing, through an evaporation-crystallization process operated at relatively low temperature. A waste stream is directed into an evaporator and heated at a temperature of less than 60° C. at a pressure below atmospheric pressure. The waste stream is concentrated through the evaporation process and forms a slurry stream having crystallized solids. At the low temperature of evaporation, the solids crystallize at substantially lower temperature and the solution has a substantially lower boiling point elevation than at atmospheric pressure. The slurry stream is directed to a solid-liquid separator where the crystallized solids in the slurry stream are separated, producing a solid cake and mother liquor.

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Hofmann, G.; Schmitz, R.; Jung, H.; “Treatment of Waste Material: Flue Gas Cleaning”; pp. 3-10.
Hofmann, G.; Schmitz, R.; Jung, H.; “Operational Experience Gained in the Evaporation of Scrubber Liquors From Flue Gas Purification in the Thermal Treatment of Industrial Waste in the RZR Herten Centre”; Translation from AbfallwirtschaftsJournal 4 (1992), Nr. 12; 15 pages.

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