Biosorption isotherms for pentachlorophenol (PCP), on granular and dis
persed anaerobic sludge from five different industrial sources fit wel
l to the Freundlich equation. No significant difference was observed i
n biosorption capacity between dispersed and granular anaerobic sludge
. Some variation in biosorption capacity was observed among the differ
ent industrial sources of sludge. Comparison with results reported by
other investigators suggested that biosorption by anaerobic biomass is
lower than that by aerobic microorganisms.