THE FORMATION OF FILTER-REMOVABLE BIODEGRADABLE ORGANIC-MATTER DURINGOZONATION

Biodegradable organic matter formed during the ozonation of natural: w aters was fractionated into rapidly and slowly degradable components b ased on measurements of biodegradable organic carbon(BDOC). The rapidl y degradable fraction (BDOCrapid) was defined using the specific BDOC reactor incubation time that resulted in biodegradation similar to tha t in a pilot scale biofilter. Ozone dose was found to increase the for mation of BDOCrapid up to a transferred dose of 1.0 to 1.5 mg O-3/mg D OG. This fraction was insensitive to DOC quantity or character. The fo rmation of BDOCslow was not sensitive to ozone dose but was sensitive to DOC quantity.