Biodegradable organic matter formed during the ozonation of natural waters was fractionated into rapidly and slowly degradable components based on measurements of biodegradable organic carbon (BDOC). The rapidly degradable fraction (BOOC,^) was defined using the specific BDOC reactor incubation time that resulted in biodegradation similar to that in a pilot scale biofilter. Ozone dose was found to increase the formation of BDOC^py up to a transferred dose of 1.0 to 1.5 mg O 3 /mg DOC. This fraction was insensitive to DOC quantity or character. The formation of BDOC,,^, was not sensitive to ozone dose but was sensitive to DOC quantity.
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