Ozonation as a Partial Treatment for CTMP Effluents, 1995 Environmental Conference Proceedings

Line Roy-Arcand

Pulp and Paper Research Institute of Canada

Myriam Méthot

Senior Technician Pulp and Paper Research Institute of Canada

Frederick Archibald

Pulp and Paper Research Institute of Canada

Ozone, when applied to CTMP mill effluents, can selectively destroy resin and fatty acids (RFAs) present as both solutes and particulates, and acute toxicity as measured in the Microtox and Daphnia magna assays. As demonstrated in a pilot trial, ozone’s application as a pre or post treatment is compatible with activated sludge treatment. Complete effluent detoxification and resin and fatty acids (RFA) and juvabione (JB) removal can be accomplished by either ozone or activated sludge alone, or by a sequential application of the two treatments applied in either order. As ozone is a not a cost-effective method to remove BOD and COD, the best candidates for ozonation would be those effluents whose toxicity is more recalcitrant to biotreatment than their BOD, or whose toxicity inhibits the biotreatment process.