why you dont try to use AOPs and Biological treatment toghether

AOPs will reduce color and will lower COD and BOD and then you can apply Biological treatmnet.

We have several full-scale case studies where ozone was used to removed various dyes from textile plant effluent.  Ozone is not technically an AOP and is much less expensive compared to AOP's and chemical removal using coagulants and flocculants.  I agree with Mohamed that biological is best for pretreatment prior to chemical oxidation.  If you have a vat or batch process perhaps it is possible to use SBR or MBBR.

Maybe you want to check the following somewhat related discussion: https://www.researchgate.net/post/Is_there_any_publication_about_compounds_used_for_waste_treatment_in_textile_industry

Galvanostatic electrolysis of waste water containing dyes using economical electrodes (graphic carbon as an anode and copper as cathode) could be used for full-scale reactors.