Experience at 100% Substitution Bleaching and the Cluster Rule, 1998 Environmental Conference Proceedings
Matthew L. Hinck
Ronald Stuart
Simpson Tacoma Kraft Company
Simpson Tacoma Kraft operates a 3 stage bleaching process that has operated at 85% substitution since 1991. The historical AOX discharge for the mill is 0.95 kg/admt which is higher than the requirements outlined in EPA’s new cluster rule. The mill conducted a 7 month trial, by operating the bleach plant at 100% substitution to determine environmental performance for AOX, 2,3,7,8 TCDD, chloroform and the 12 chlorinated phenolics. The trial results show that at a prebleach kappa of 26 or less, the mill should be in compliance with the new EPA cluster rule regulations for the aforementioned compounds. Such results allow the mill to plan for the future and focus future work on optimization and expansion.
Experience at 100% Substitution Bleaching and the Cluster Rule, 1998 Environmental Conference Procee