Why does COD increase after ozone treatment of sewage?
Release time:
Jul 16,2026
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One is the mechanism of action of ozone: ozone can decompose large molecular groups, turning some previously undetectable substances into visible ones.
The main reasons for the increase in COD after ozone treatment include:
One is the mechanism of action of ozone: ozone can decompose large molecular groups, turning some previously undetectable substances into visible ones. Therefore, in the early stages, ozone is more of a ring breaking and chain breaking effect, which can temporarily increase COD values.
The second is the oxidation of recalcitrant substances: Ozone treatment can partially oxidize some recalcitrant organic matter, allowing it to be better oxidized by potassium dichromate, resulting in an increase in COD value.
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