Membrane processes for metal recovery and pollution control in metal process industries
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United States of America Patent
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Apr 7, 1987
Grant Date -
N/A
app pub date -
Oct 18, 1983
filing date -
Oct 18, 1983
priority date (Note) -
Expired
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Abstract
A process for the treatment of an aqueous stream containing an acid or base and typically a precipitatable material such as a metal ion comprises: (a) subjecting the aqueous stream to (i) a treatment to produce a relatively pure stream of water and a concentrated aqueous stream, and (ii) water splitting to produce a stream of base, a stream of acid and a dilute aqueous stream of a concentration lower than the concentrated aqueous stream, the treatments (i) and (ii) being effected in either order, (b) recycling at least part of the pure water stream produced in (a)(i) to an earlier stream either in the production leading to said aqueous stream or to step (i) or (ii), (c) recycling at least part of the acid and/or base streams produced in (a)(ii) to an earlier stream either in the production leading to said aqueous stream or to an earlier step in the process, and (d) recycling at least part of the lower concentration stream produced in (a)(ii) to either (a)(i) or to another step in the process, whereby, when present, only the precipitatable material is removed from the aqueous stream, thereby obviating toxic waste disposal problems.
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