Effluent Free Chlorine Dioxide Generating Plant for Pulp Bleaching

Towards zero-effluent pulp and paper production: The pivotal role of totally chlorine free bleaching.

Optimization of Laccase-Aided Chlorine Dioxide Bleaching of Bagasse Pulp

The laccase-mediator system in laccase-aided chlorine dioxide bleaching of bagasse pulp was optimized using response surface methodology (RSM). The effects and interactions of the laccase enzyme dosage, the dosage of the mediator 1-hydroxybenzotriazole (HBT), and the reaction time on the adsorbed organic halogen (AOX) content of the wastewater as well as the brightness and kappa number of the p...

Elemental Chlorine-Free (ECF) bleaching -- based on chlorine dioxide -- is the superior choice

for pulp and paper manufacture. The science, a proven environmental track record, and strong market demand demonstrate that ECF is without rival in terms of pollution prevention, resource conservation, and product quality. "Chlorine dioxide is a solution to dioxin and other persistent, bio-accumulative, toxic substances in mill waste water." [1] Dr. Robert Huggett, former U.S. EPA Assistant Adm...

Chlorine Dioxide Bleaching of Soda-anthraquinone Jute Pulp to a Very High Brightness

Bleaching of soda-anthraquinone jute pulp by chlorine dioxide (ClO2) was studied to reach a target brightness of above 88% for the purpose of using less bleaching chemicals. The performance of either chlorine dioxide or peroxide in the final bleaching to boost brightness was also studied. The experimental results revealed that the final brightness depended on ClO2 charge in the Do and D1 stages...

Kinetics of AOX Formation in Chlorine Dioxide Bleaching of Bagasse Pulp

In this paper, a kinetic model of the first chlorine dioxide bleaching stage (D0) in an elemental chlorine-free (ECF) bleaching sequence is presented for bagasse pulps. The model is based on the rate of adsorbable organic halogen (AOX) formation. The effects of the chlorine dioxide dosage, the sulfuric acid dosage, and the reaction temperature on the AOX content of wastewater are examined. The ...