You should carry out a jar ...

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You should carry out a jar test to see how much oil you can remove. Normally DAF can’t remove oil to below 10 ppm.

 

Depends on what kind of COD reminded in your water, biological process normally can reduce COD to 50 ppm. If the influent soluble COD is 50 ppm, most biological process will not work. What you need is physical (membrane filtration) or chemical (zonation) process to achieve the target.

 

I am assuming your water is the effluent of MF, why don’t feed the RO directly? If the jar test can’t remove oil anymore, then you need a chemical process to oxidize it.