Nowadays the ozonation-BAC treatment process,
which integrates the strong oxidation and disinfection
capabilities of ozone and the high adsorption and
biodegradation capacities of BAC, has become a
popular advanced water treatment technology which
has been implemented all over the world (Zhou and
Qiu, 1998). When ozonation-BAC treatment process
is used, BAC becomes the last filtration technology
prior to disinfection. Almost all investigations previously
undertaken have focused upon the relationships
among particle counts, turbidity, Cryptosporidium
and Giardia, sand filter performance examination,
and the use of particle counters, rather than
the impact of BAC filters. This paper presents the
results of particle counts in BAC filter effluent obtained
by a 10 m3/h pilot plant.