High recovery sulfate removal process

Details High recovery sulfate removal process High recovery sulfate removal process

C - Chemistry, Metallurgy

02

F

C02F 1/44 (2006.01) C02F 1/52 (2006.01)

Patent

CA 2737356

A high recovery sulfate removal process comprises treating a feed water stream conditioned with antiscalant from a source with a reverse osmosis membrane system to produce a purified water permeate stream and a reject stream containing the retained or rejected ions and organic matter. The reject stream is further treated to remove dissolved and suspended species. The reject stream flows to a desaturation/ clarification process. A preferred process includes a constant stirred tank reactor (CSTR) where coprecipitation agent is added followed by a clarifier. Water recycled from the clarifier overflow is blended with feed water stream. The removed solids are collected as sludge or a slurry and disposed of in a manner consistent with applicable regulations.

Linvention concerne un procédé délimination de sulfate à récupération élevée qui comprend le traitement dun courant deau dalimentation conditionné avec un anti-tartre issu dune source avec un système à membrane dosmose inverse pour produire un courant de perméat deau purifié et un courant de rejet contenant les ions retenus ou rejetés et des matières organiques. Le courant rejeté est encore traité pour éliminer les espèces dissoutes et suspendues. Le courant rejeté sécoule vers un procédé de désaturation/clarification. Un procédé préféré inclut un réacteur continu (CSTR) dans lequel un agent de co-précipitation est ajouté, suivi par un clarificateur. Leau recyclée à partir du trop-plein du clarificateur est mélangée avec le courant deau dalimentation. Les solides éliminés sont recueillis sous la forme dune boue ou pâte et mis au rebut dune manière conforme aux réglementations applicables.

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