Bleaching

PULP AND PAPER PROCESSES: PRAXAIR'S OZone Bleaching REduces Chlorine Usage

A better alternative to chlorine

In response to our planet’s growing environmental challenges, pulp and paper mills have eliminated the use of chemicals like chlorine in bleaching processes in order to eliminate the production of adsorbable organic compounds (AOX).

Curbing Emissions

bleaching process diagramOzone bleaching, combined with oxygen delignification and other non-chlorine bleaching technologies, helps mills curb emissions and meet environmental standards cost effectively. The process results in a higher percentage of recycled process water, lower chemical oxygen demand discharges, and reduced color in mill waste. All of these benefits, in addition to the reduction of chlorine in the process, can help pulp mills meet tight environmental demands.

Benefits:

  • Chlorine and chlorine dioxide are replaced
  • AOX is reduced or eliminated
  • Biological oxygen demand/chemical oxygen demand is lowered and effluent color is reduced
  • Higher process water recycling rates can be achieved
  • An important step towards total chlorine free or elemental free pulp production and mill closure

Pulp Bleaching with Ozone (129KB)