Method for purifying process water from pulp manufacture
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United States of America Patent
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Aug 1, 1995
Grant Date -
N/A
app pub date -
Feb 2, 1994
filing date -
Nov 15, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Process water from pulp manufacture is purified in a separator device by mechanical or a combination of mechanical and chemical methods and is thereafter evaporated, at least part of the concentrate resulting from the evaporation being recycled and mixed with the process water fed into the separator device. In a preferred embodiment, a precipitant is added to the mixed water comprising the process water and the concentrate. The part of the concentrate not recycled and mixed with the process water is supplied, optionally after further evaporation, with an acid to a pH of 1-5, whereupon resulting flocs and precipitates are removed in a separator device.
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