Disinfection of bacteria attached to granular activated carbon.
AUTOR(ES)
LeChevallier, M W
RESUMO
Heterotrophic plate count bacteria, coliform organisms, and pathogenic microorganisms attached to granular activated carbon 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 h) for 1 h, no significant decrease in viable counts was observed. Washed cells attached to the surface of granular activated carbon particles showed similar resistance to chlorine, but a progressive increase in sublethal injury was found. Observations made by scanning electron microscope indicated that granular activated carbon was colonized by bacteria which 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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=241651Documentos Relacionados
- Tratamento de efluentes industriais mediante a aplicação de argila organifílica e carvão ativado granular.
- Bacteria associated with granular activated carbon particles in drinking water.
- Production and characterization of granular activated carbon from activated sludge
- Growth and persistence of pathogens on granular activated carbon filters.
- Assessment of bacterial growth and total organic carbon removal on granular activated carbon contactors.