Provided is an efficient treating method for coating material waste water
which meets a change in a concentration of contaminants contained in waste water
and a change in a treating amount by converting scarcely decomposable substances
contained in the coating material waste water to easily decomposable substances.
The coating material waste water is irradiated with a micro wave to decompose organic
substances contained in the above waste water. Further, the coating material waste
water before irradiated with a micro wave may be subjected, if necessary, to coagulation
treatment by a flocculant or electrolytic treatment. After irradiating with a micro
wave to decompose scarcely decomposable substances contained in the waste water
to easily decomposable substances, the resulting treated water is preferably fed
to a biological reaction bath and subjected to biological treatment under aerobic
or anaerobic atmosphere.
