A METHOD FOR REMOVING HUMIC SUBSTANCES FROM AN AQUEOUS ALKALINE SOLUTION

A METHOD FOR REMOVING HUMIC SUBSTANCES FROM AN AQUEOUS ALKALINE SOLUTION

A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises -obtaining an aqueous alkaline waste water comprising humic substances such as dissol...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: AHLGREN, Jonni, RUOTSALAINEN, Jussi, LUHTALA, Maria, NIEMELÄ, Miia, HALTTUNEN, Sakari
Format: Patent
Sprache:eng ; fre ; 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:A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises -obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and -adding a high cationic starch having a charge density value of at least 1.8 meq/g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.