Published by saba mahdavi
Is there an efficient way to extract caustic soda from desalination waste so that we can reuse it?
Thank you!
The desalination waste not contain sodium but can be converted into material can be converted into useful chemicals — including ones that can make the desalination process itself more efficient.
The approach can be used to produce sodium hydroxide, among other products. Otherwise known as caustic soda, sodium hydroxide can be used to pretreat seawater going into the desalination plant. This changes the acidity of the water, which helps to prevent fouling of the membranes used to filter out the salty water — a major cause of interruptions and failures in typical reverse osmosis desalination plants.This very concentrated brine has to be handled carefully to protect life in the ocean, and it’s a resource waste, and it costs energy to pump it back out to sea,” so turning it into a useful commodity is a win-win, Kumar says. And sodium hydroxide is such a ubiquitous chemical that “every lab at MIT has some,” he says, so finding markets for it should not be difficult..
Published by Prem Baboo, Researcher at www.researchGate.net
Hello Mr. Saba,
Desalination waste as such does not contain caustic soda. It is merely sodium chloride solution (brine) with variety of other impurities. After removal of other impurities the brine, by electrolysis, needs to be converted into caustic soda.
Once that done, the caustic solution after evaporation & concentration can be converted into caustic.
Brine is important raw material for caustic industry.
Published by Dr Harshvardhan Modak, Vice President, National Solid Waste Association of India, MD, Aquarion India,
Hi Saba, not quite sure what the other responders are proposing. Just to say caustic is highly soluble and therefore rather difficult to extract from your brine. So as a suggestion you may be able to extract everything else leaving you a caustic solution. The only way I can think of that may be economically viable is the process of freeze crystalization whereby you super-concentrate your brine by freeze desalination (e.g. hybrid-ice process) leaving behind the most soluble components. Just some thoughts - good luck
Published by Ian Pearson
Think so. Like to know a little more--volume, flow expected....we can remove micro as well as some solvents. I can send you a PDF should that help you determining.
Published by Jim Quigley
Jim Quigley please upload the PDF for all members benefit
Published by Water Network Research, Official research team of The Water Network
We are consulting for the same to our client, a new project. Please share the details at servicesenvirochem@gmail.com
Published by Sameer Dohare, Managing Director at EnviroChem Services (OPC) Pvt. Ltd.
Hi Sameer, please can you provide some insight as to approach for everyone's benefit
Published by Water Network Research, Official research team of The Water Network
Probably. I am on the Board of Nereid (nereidwater.com ). What would be the volume of water and context in which the solution would be deployed (please use my Nereid e-mail: patrick.scherrer@nereidwater.com)
Published by Patrick Scherrer
Hi Patrick- please can you provide some insight as to Nereid's approach for everyone's benefit
Published by Water Network Research, Official research team of The Water Network
Maybe, need a little more info Filtration system for micro and more. Can you send me additional info--size, volume, goals
PDF if you need
Use Jim quigley5@gmail.com
Published by Jim Quigley