Record Display for the EPA National Library Catalog


Main Title Activated Carbon Treatment of Kraft Bleaching Effluents.
Author Lang, E. W. ; Stephens, J. W. ; Miller., R. L. ;
CORP Author Saint Regis Paper Co., Cantonment, Fla.;Industrial Environmental Research Lab.-Cincinnati, Corvallis, Oreg. Food and Wood Products Branch.
Year Published 1977
Report Number EPA-R-803270; EPA/600/2-77/119;
Stock Number PB-271 708
Additional Subjects Activated carbon treatment ; Paper industry ; Water pollution control ; Bleaching ; Cost analysis ; Operating costs ; Capitalized costs ; Industrial waste treatment ; Pilot plants ; Adsorption ; Process charting ; Performance evaluation ; Concentration(Composition) ; Isotherms ;
Library Call Number Additional Info Location Last
NTIS  PB-271 708 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 67p
The removal of color and organic contaminants by adsorption on activated carbon from the effluent of a kraft pulp bleaching plant was investigated in a pilot plant. The caustic bleach effluent, which contains 80% of the color from pulp bleaching, was decolorized successfully when it was adjusted to pH 2.5. The spent carbon was regenerated with caustic solution for an average of 11 adsorption-regeneration cycles before thermal regeneration was required. Variables studied included pH of feed, feed rate, effluent from bleaching of hardwood and softwood, caustic requirements for regenerating the carbon, and concentration of color in feed. Capital and operating cost estimates for a full-scale plant are presented. The cost effects of variations in design and operating conditions are also discussed. Conclusions are that the process is technically sound, that it will remove 94% of the color and 84% of the total organic carbon from caustic bleach effluent from the bleaching of softwood, but that it has slightly higher capital and operating costs than alternative methods for reducing color in bleach effluents (resin adsorption, ultrafiltration, or bleach sequence modifications, for example).