Dear Mr. Pramod,  The very ...

Dear Mr. Pramod, 

The very fact that you have aerated the effluent & it reduced the TDS, keeping the balance at 2900ppm, indicates that you have destroyed BOD. Thus any additional treatment for BOD removal is not needed. 

Now, kindly check the ash content of the same aerated effluent to verify, if all TDS is inorganic only or some non-biodegradable COD is remaining.

If you find ash is equivalent to 2900ppm, then COD is not there & whatever balance is inorganic dissolved solids only.

Then you are left with the option of mixing the same with incoming raw water, let it undergo usual treatment & reuse the same in process. The merit of this system is it does not leave any problem of residue.  

Alternatively, if the above is not acceptable to management not for technical, but psychological reasons, then you will have to invest in RO to extract substantial portion of permeate at less than 50ppm TDS, which can reused, but balance must be sent to evaporation ponds to remove the dissolved unwanted salts to send them to waste disposal. 

Please understand that washing removes many adhering soil components  adhering to vegetables.