VERFAHREN ZUR REINIGUNG VON PROZESSWASSER AUS DER ZELLSTOFFHERSTELLUNG

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: GOERANSSON, GUNNAR, SUNDBLAD, BIRGITTA, LANDFORS, JOHAN, BALTS N, HANS, KE
Format: Patent
Sprache:ger
Schlagworte:
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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Beschreibung
Zusammenfassung: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.