Biologically active filters (BAFs) are
applied in drinking water treatment to
remove contaminants such as natural
organic matter, nitrate, trace organic compounds,
perchlorate, sulfate, iron, and
manganese. BAFs and other biological
water treatment processes make use of
microbial communities to metabolize contaminants
through mediating oxidation-
reduction reactions.
This study was undertaken first to
address the lack of knowledge about microbial
communities in BAFs and associated
treatment units upstream and downstream
and second to pinpoint ways to control or
improve filtration performance. A comprehensive
review is provided of state-of-the-art
knowledge about BAFs, their operating
parameters, and microbiological
approaches to control of biological activity
in the filters.
Controlling biofilm thickness and producing
microbial communities fully adapted to
targeted contaminants constitute significant
scientific and engineering challenges. A better
understanding of the microbial communities
in BAFs will help identify solutions to
optimize their performance, alleviate concerns
about pathogenic breakthrough, and
lower operating costs.Includes 127 references, table, figure.