Activated carbon treatment is shown to constitute a substantial barrier for the microbiological determinands of standard plate counts and total coliforms; apparent reductions in faecal coliforms, faecal streptococci and coliphage counts were not validated statistically. Insofare as various waterborne pathogens have been shown to be apable of proliferating in granular carbon adsorbers, disinfective pretreatment will be very beneficial to reduce the number of pathogens reaching the adsorbers. Teh mode of granular carbon adsorbers, disinfective pretreatment will be very beneficial to reduce the number of pathogens reaching the adsorbers. The mode of granular activated carbo ntreatment (radiated, control, pre-ozonated) did not have a statistically discernible influence on microbiological product water quality, suggesting that the use of activated carbon as such overrode the possible influences of pre-or attendant treatment.
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