Chloride removal from wastewater

[ChrisDerrick]

Dear Experts:

I have been asked to find a way to remove chlorides from 2.1 million gallons of petroleum contact wastewater. Chlorides must be reduced from 850 mg/l to 500 mg/l (Cl-). This project is a one time treatment and discharge. Therefore, both RO and Ion Exchange are not economically feasable. Evaporation is not a viable option. Silver chloride and/or lead chloride precipitation are obviously not workable options. I have seen several references to Ultra HIgh Lime with Alumina Treatment but have not found a good description of how or if it works. Is there any other method of removing chlorides from water???? Better yet, is there a referance available that compares and contrasts the various methods on one text??????

Thanks in advance

 

[SharkswithLasers]

I've always heard that there was no practical way to remove chlorides from wastewaters like the wastewater you discuss, but I did find the following article on the web. Perhaps the batch process is something that can be used to drive the chlorides down enough to allow discharge?

From the website -

http://www.hptresearch.com/other.html

Chloride Removal:

HPT Research, Inc. is presently engaged in a R & D project for the removal of salt from water. Excellent reductions of chlorides have been achieved in both bench top and pilot plant tests of food processing brine solutions. Between 90% to 94% reductions in chlorides and BOD have been realized in the pilot plant treatment of olive brine solutions. The process is presently being tested for possible use in the pre-treatment of ocean water prior to Reverse Osmosis Desalinization. Initial results indicate the HPT Salt Removal process has the potential of increasing the efficiencies and economies of Reverse Osmosis desalinization.

 

[ChrisDerrick]

Thanks for the response SharkswithLasers. To the best of my knowledge there is no other way to remove chlorides from this type of water. But... I wanted to double check just in case.