Method of treating waste water with high Nacl and COD

Electrocoagulation to destroy most of the organics, then pH balancing, followed by RO using desalination membranes or evaporation in a vacuum evaporator. The water can then be reprocessed for reuse.

22% Salt is good.

You can go into Brine and salt business.

If you have plenty of sun you need not worry about energy bills.

The saltiest Sea--Red Sea has only 4.3% dissolved salt.

Gusgundag Lake in TransCaucasus --the world Record-- has 36%!

At 22percent (220,000ppm, 220ppt, x6-7 sea water), easiest way would be to distill the remaining water, precipitate the salts, and condense water vapor. ROs require dual pass even when it is only 4.3%, and the reject brine is less than 10%.

Look for source controls or change processes making up the COD and salts.

Tom Williams

What organic is causing COD? If a food grade material there are uses of stream.

Is it possible to briefly explain the effluent generation process and the application. This would help in two things, one you can find if any reuse of this brine is possible for a different application or if you can have any plant species which will survive this liquid. I am informed by an agricultural university that there are certain species of plants/ trees like Jute and Coconut which needs salt for their growth. Hope this helps..

Hi, Guest!

This potential solution depends upon current research in the subject of saline solution disassociation using known catalytic or precipitation processes.

I am inventing it on the spot, so patience if I'm awayyy out in left field.

If you were able to provide a multi-channel diverter for your effluent flow so that it passed through e.g. two out of a possible 8 channels in which it had to come into contact with a serious cat/precip element, several results might be obtained.

• After the first two channels had become nullified due to lack of remaining useful surface of the cat/precips, you could then divert the channels into the next two while maintenance/cleaning/replacement of the catalysts was being undertaken in the first two.
• If the cat/precips were used to break down the H2O component of the solution, then the salts would precipitate out of it. If there were such a thing as a catalyst that adsorbs/precipitates NaCl directly by crystallizing it out of solution, you could avoid electrolyzing the solution.

Either the solution could pass through the cat/precips, or the catalysts or precipitators could be made to pass through the solution, thus rendering them easier to replace during downtime, such as creating a rotating drum catalyst or precipitator, where only the drum requires reconditioning/replacement.

I suspect that you might find the materials you need not only in standard catalyst type elements, but also in polymer research and nano technology.

The reason for this blog is the massive size of the flow rate you describe and the massive size of the dissolved (?really, that efficient of a solution in water?) salt content. Using a multi-channeled flow system will allow you to remain running during maintenance time.

Now, do any of the chemical guys have a suggestion for the catalysts or precipitation method?

Mark

Look at membrane bio-reactors [MBRs] as a starting point, and do a process trial.