Abstract
Ozone pretreatment studies of humic acids were conducted to evaluate the effects of ozonation on the biodegradability of the oxidation products as a function of COD-, DOC-elimination, decrease of u.v.-absorbance and ozone consumption. A 50–60% decrease of the COD-value and a 30% decrease of the DOC-value lead to biodegradable products (BOD 5/COD = 0.4) in most cases independent of the pH-value and the initial concentration. To reach these results 3.4–4 mg ozone are consumed per mg initial DOC. With this ozone consumption complete decolorization of the solutions is achieved and the value of u.v./DOC decreases from 4 to 0.8 m 2 g −1.
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