Abstract
This research aimed to idendfy and understand mechanisms that underlie the beneficial effect of ozonation on removal of pesdcides and other micropoUutants by Granular Activated Carbon (GAC) filtradon. This allows optimization of the combination of these two processes, termed Biological Activated Carbon filtration. The study concluded that ozonation significantiy Improves removal of atrazine by GAC filtration not only due to the wellknown effect of oxidation of atrazine, but also due to the effect of partial oxidation of Background Organic Matter (BOM) present In water. Ozone-induced oxidation of BOM was found to improve adsorption of atrazine in GAC filters. Biodegradation of atrazine in these filters was not demonstrated. Higher GAC's adsorption capacity for atrazine and faster atrazine's mass transfer in filters with ozonated rather than non-ozonated influent were explained as due to reduced competitive adsorption and reduced preloading of ozonated BOM. Both can be attributed to enhanced biodegradability and reduced adsorbability of partially oxidized BOM compounds, resulting in their increased biodegradation and decreased adsorption In GAC filters.
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