Process for purification and recycle of solutions
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United States of America Patent
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Aug 20, 1996
Grant Date -
N/A
app pub date -
Feb 2, 1994
filing date -
Nov 15, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a process for treating a low-concentrated aqueous feed solution which includes at least one aqueous process stream from a pulp mill. The process includes concentrating the feed solution by evaporation to form an evaporation concentrate, and subjecting at least a part of the concentrate to a first electrodialysis treatment, thereby forming a first electrodialysis concentrate containing salt removed from the evaporation concentrate and at least one diluate depleted in the salt. The invention also relates to a plant for carrying out the above process.
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