VERFAHREN ZUR REINIGUNG VON PROZESSWASSER AUS DER ZELLSTOFFHERSTELLUNG

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...

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Main Authors SUNDBLAD, BIRGITTA, S-412 66 GOETEBORG, SE, LANDFORS, JOHAN, S-840 10 LJUNGAVERK, SE, GOERANSSON, GUNNAR, S-463 94 LILLA EDET, SE, BALTS N, HANS, KE, S-432 32 VARBERG, SE
Format Patent
LanguageGerman
Published 27.08.1998
Edition6
Subjects
CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary: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.
Bibliography:Application Number: DE19946009396T