| The Pulp and Paper mills in North America are eagerly searching for new cost-effective technology to clean their process water for improved value-added recycling. In this study, chemical and biochemical treatment was incorporated into Dissolved Air Flotation (DAF) technology to help reduce the dissolved and colloidal substances, anionic trash and colour content.;The implementation of a packed activated carbon bed after DAF treatment enhanced the removal of dissolved solids by up to 40% and reduced the chemical oxygen demand by up to 90%. A reactivation temperature of 250°C was found to be the most effective for burning dissolved solids, colloidal substances and colour material, so that the activated carbon can be reused.;The biopolymer Chitosan was determined ineffective in the removal of dissolved solids along with various zeolites, talc, guar gum, and other chemicals. The supplied bioenzyme as a co-factor, demonstrated good colour and colloidal component removal efficiency by up to 20% after a 12-hour retention time post-DAF treatment. However, no biochemical treatment surpassed the conventional chemical treatment of polyaluminum chloride, polyamine and polyacrylamide with respect to cost vs. efficiency. |
