The only guaranteed method to ...

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The only guaranteed method to reduce COD by at least 90% is OZON. Ozon has no residual effect (usually) but any excess ozon must be destructed or the treated wastewater must be stored for a certain period of time (max 24 hrs) so the ozon will revert to molecular oxygene. The whole process can be monitored by measuring either the ORP or the residual ozone.