Dears,
I am designing a wastewater treatment plant for an industrial plant, the client requires the max water recovery to be recycled for zld approach.

WW analysis is as follows:

- Max. flow: 650 m3/h
- BOD: 47 ppm
- COD: 63 ppm
- TSS: 40 ppm
- TDS: 1,366 ppm
- NH4-N:384 ppm
- NH4: 466 ppm
- O&G: 15 ppm
- TH as CaCO3: 294 ppm

Discharge requirements:
- BOD: 60 ppm
- COD: 100 ppm
- TSS: 60 ppm
- TDS: 28,500 - 31,500 ppm
- NH4: 3 ppm
- O&G: 10 ppm

Recycled quality:
- BOD: 10 ppm
- COD: 30 ppm
- TSS: 10 ppm
- TDS: 200 ppm
- TH as CaCO3: 22 ppm


My proposed treatment scheme is as follows:
- Screening
- Oil removal
- Ammonia stripping (due to low BOD, COD and TSS, I didn't go for biological treatment)
- Desalination
- Evaporation and crystallization

My question is what is the most feasible method for desal; RO or EDR? Through my survey, I am quiet sure it is EDR but I really do not know why???? in addition I do not know a supplier for EDR, could you recommend one?

Regards,