You may find some ...

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You may find some information in this similar forum:

https://www.researchgate.net/post/What_low-cost_methods_are_available_to_remove_TDS_in_wastewater

The suggestion to differentiate between organic and inorganic TDS is spot on. You did not say if you have a biological wastewater treatment process in your description, as this will take out the organic fraction. RO and evaporation of reject is very energy intensive unless you have a lot of excess land and can use an evaporative pond.