Record Display for the EPA National Library Catalog


Main Title Disinfection of Bacteria Attached to Granular Activated Carbon.
Author LeChevallier, M. W. ; Hassenauer, T. S. ; Camper, A. K. ; McFeters, G. A. ;
CORP Author Montana State Univ., Bozeman. Dept. of Microbiology.;Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
Year Published 1984
Report Number EPA-R-810015; EPA/600/J-84/370;
Stock Number PB86-188174
Additional Subjects Microorganisms ; Disinfection ; Chlorine ; Bacteria ; Carbon ; Particles ; Reprints ; Water pollution control
Library Call Number Additional Info Location Last
NTIS  PB86-188174 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Heterotrophic plate count bacteria, coliform organisms, and pathogenic microorganisms attached to granular activated carbon (GAC) particles were examined for their susceptibility to chlorine disinfection. When these bacteria were grown on carbon particles and then disinfected with 2.0 mg of chlorine per liter (1.4 to 1.6 mg of free chlorine residual per liter after 1 hr) for 1 hr, no significant decrease in viable counts was observed. Washed cells attached to the surface of GAC particles showed similar resistance to chlorine, but a progressive increase in sublethal injury was found. Observations made by scanning electron microscope indicated that GAC was colonized by bacteria that grow in cracks and crevices and are coated by an extracellular slime layer. These data suggest a possible mechanism by which treatment and disinfection barriers can be penetrated and pathogenic bacteria may enter drinking water supplies.