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High TDS Effluent : Suitable Alternatives? - Andhra Pradesh

Please confirm whether any alternate chemical / salt  can be used in place of Sodium Chloride for Soft water plant regeneration as usage of the same is leading to High TDS effluent problem. Need of this request and end usage of the requested information is to meet the Effluent discharge standards set by the local Pollution control Board. We are in Bulk drug manufacturing industry.  We are using softener plants of with (Capacities : 80 KL / per regeneration and 100  KL / per regeneration ). TDS Levels in the reject are  ranging from 15000 to 18000 mg / lt.Reject volume is about 5.5 KL.

 

Our requirement for the reject is with less than 5000 mg / lt TDS without any increase in the volumes. What steps can be taken to ensure the above mentioned end result?

Krishnamohan

krishnamohan@neulandlabs.com

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Comments

1.

Dear Krishnamohan,

To the best of my knowledge there is no substitute for NaCl. The accumulated Ca or Mg ion has to be replaced by another ion which is Na and causes Ca or Mg to be leached out resulting in TDS in the bleed.

There is another salt free softening system. Please see website http://www.freedrinkingwater.com/saltfree10-water-softener.htm
The water coming out of it is free of hardness and has the Ca and Mg in nano sizes which can be filtered out using cartridge micron filters which can be replaced just like in R O plants.

Alternatively, the bleed containing TDS has to be put through spray ponds and evaporated and resulting salt contained on site in HDPE containers or sent to landfills if available.

Thanks & Regards

Dr. S. Sundaramoorthy
Technical Advisor (ex-Engineering Director of Chennai Metropolitan Water Supply and Sewerage Board)
Creative Environmental Consultants
Chennai, Madras

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