if your waster have smell or odor, in your current water treatment process what oxidant? if not ozone, you can think of ozone to remove smell or odor.
If you have ETP, please offer process diagram and BOD, COD, TSS, PH of water out from ETP, along with your requirement , I can help you
We need to think of 2 questions for your smell.
1. how much ozone per hour is necessary at least for wastewater in your ETP?
2. where we can in your ETP or WWTp or how to add ozone into your waster water?