Method of treating process water

Details Method of treating process water Method of treating process water

D - Textiles, Paper

21

C

D21C 11/00 (2006.01) C02F 1/52 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2160123

A method of treating process water con- taining metal ions in connection with bleach- ing pulp of ligno-cellulose-containing material. The process water is brought into contact with an alkaline liquid, which preferably also con- tains sulphide, whereby metal ions precipitate in the form of difficultly soluble metal compounds. The precipitated metal compounds thereafter are separated from the process water.

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