I will add: 1) Correct ...

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I will add:

1) Correct nutrient balance (depending on the type of treatment)
2) If you have recalcitrant COD (and how much it is).
3) Temperature.
4) Disponible area.
5) Required removal.
6) Others

Surely they will be more parameters to have into account.

Regards,

Orlando D. Gutiérrez Coronado