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Title: Process for removing sulfate anions from waste water

A liquid emulsion membrane process for removing sulfate anions from waste water is disclosed. The liquid emulsion membrane process includes the steps of: (a) providing a liquid emulsion formed from an aqueous strip solution and an organic phase that contains an extractant capable of removing sulfate anions from waste water; (b) dispersing the liquid emulsion in globule form into a quantity of waste water containing sulfate anions to allow the organic phase in each globule of the emulsion to extract and absorb sulfate anions from the waste water and (c) separating the emulsion including its organic phase and absorbed sulfate anions from the waste water to provide waste water containing substantially no sulfate anions.
 [1];  [2];  [3];  [2]
  1. (Lebanon, OR)
  2. (Albany, OR)
  3. (Corvallis, OR)
Issue Date:
OSTI Identifier:
United States of America (Washington, DC) NETL
Patent Number(s):
US 5593593
Research Org:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
Country of Publication:
United States
process; removing; sulfate; anions; waste; water; liquid; emulsion; membrane; disclosed; steps; providing; formed; aqueous; strip; solution; organic; phase; contains; extractant; capable; dispersing; globule; form; quantity; containing; allow; extract; absorb; separating; including; absorbed; provide; substantially; sulfate anions; waste water; organic phase; water containing; removing sulfate; membrane process; aqueous strip; liquid emulsion; strip solution; containing substantially; emulsion formed; emulsion membrane; containing substantial; /210/