Can acidic wastewater regenerated from ion-exchange membrane electrolysis processes using chelating resin columns be recovered as brine?
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Can acidic wastewater regenerated from ion-exchange membrane electrolysis processes using chelating resin columns be recovered as brine? If it is recycled, will metal ions accumulate in the saline solution?
It can be used in brine; metal ions can be removed during the purification of the brine, and the resin is used to precisely control the metal ion content
It can be used as water for salting, as well as as an acid for pH adjustment in the dechlorination of brackish water.
Long-term use does have some impact, but it’s not significant. These days, zero emissions are a priority, and most materials are recycled.
Most companies need to recycle the water; acidic water is sent to the anode solution discharge tank or is adjusted through dechlorination, while alkaline water is returned for salt recovery or, under certain conditions, is adjusted through dechlorination of the alkali. This approach can help save some resources, as it is better than simply carrying out acid-base neutralization before recycling. Given the severe environmental challenges, there is little to no discharge of such water, and there is also not much accumulation of metal ions, as most of them can be removed during the purification process
The acidic water regenerated from the resin tower can be used; once it reaches the primary brine stage, care must be taken to monitor the alkali level. You can also combine the acidic water with the regenerated alkaline water and reuse it.
Generally, acidic water and alkaline water are mixed together and then sent to the chemical salt production process to form chemical salt solution. It is important to adjust the acidity or alkalinity of this solution. As for heavy metal ions, there is no need to worry about them, as they originate from the brine itself, and their concentration is relatively low. Most of these ions are removed during the calcium and magnesium removal process, with any remaining amount being treated through resin adsorption, so no accumulation occurs.
Previously, we used it for recycling salts, but now we recycle it to produce industrial acids.