Method of controlling of metals in a bleach plant, using oxidati

Details Method of controlling of metals in a bleach plant, using oxidati Method of controlling of metals in a bleach plant, using oxidati

1993-08-31

1997-06-17

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 301, 162 37, 162 38, 162 65, 162 78, 210712, 210724, 210722, 210912, 210919, 210928, D21C 9153, D21C 916, D21C 1100

Patent

active

056393474

ABSTRACT:
A method and apparatus facilitate removal of metals from acidic liquids containing dissolved metals (such as pulp mill bleach plant washer filtrate) by oxidizing the liquid with ozone, hydrogen peroxide, oxygen, and/or air to increase the valence of the metals (like Mn and Fe) so that they become easier to precipitate. Oxidation may be practiced using any suitable reactor, such as a gas-contact reactor, or a plunger type reactor where the oxidizing agent is primarily gaseous, or a static mixer or stirred tank where the oxidizing agent is primarily liquid. After oxidation the pH of the liquid is adjusted (e.g. to over 6, preferably about 8-11) to precipitate the metals. The precipitated metals are then removed by filtration, sedimentation or flotation, and the metals-depleted liquid used elsewhere in the pulp mill.

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Kvaerner Pulping, "Observation by Third Party Against European patent appln. No. 94910843.5 . . . ", Mar. 4, 1996.
Dean et al, "Removing heavy metals from waste water", Environmental Science & Technology, vol. 6, No. 6, Jun., 1972, pp. 518-522.
Patterson et al, "Carbonate precipitation for heavy metals pollutants", Journal WPCF, Dec. 1977, pp. 2397-2410.

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