Treatment of high-concentration saline water
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Dear experts: Our company plans to carry out technical upgrades and expand production, with an expected wastewater volume of 600 T per day, containing approximately 17% sodium sulfate and about 10% sodium chloride. (The above is an estimate based on material balance) ； COD 20000; COD is primarily composed of sodium p-acetamidobenzenesulfinate, ethylene oxide, p-acetamidobenzenesulfonyl chloride, etc. (it is the raw material from the previous step and is intended to be recycled). Is it possible to reduce the levels of sodium sulfate to 2% and sodium chloride to less than 2%, while keeping the COD in the water? If anyone has a solution, please send it to me via email at hhp1972897@sohu.com.
There is no other good solution besides evaporation crystallization.
Evaporation will cause sodium p-acetylaminobenzenesulfinate and p-acetylaminobenzenesulfonyl chloride to hydrolyze.
This post was last edited by Gorou’s Eight Trigrams Staff on 2015-11-16 09:07. Electrodialysis works for simple desalination. Remove an equal amount of salts and other substances from the wastewater. Learn more,
The solution is frozen at -2 degrees, with the sodium sulfate concentration reduced to below 1%. Electrodialysis to reduce sodium chloride to below 1%. The solution is returned to the front-end process. If low-temperature refrigeration equipment is not desired, two-stage electrodialysis can also be chosen. Grade 1 is a monovalent ion-selective membrane used to separate sodium chloride. Secondary conventional membrane electrodialysis is used to separate sodium sulfate. The solution is returned to the front-end process, but it is not clear at present whether the other components in the solution you mentioned are corrosive to the membrane. Confirm first whether it will corrode the ion-selective membrane before making a decision.
We have a technology: a non-membrane, non-mechanical evaporation wastewater zero-discharge technology that may be able to solve your problem. However, your facility needs to have a circulating cooling water system. The detailed technical information has been sent to your email; feel free to contact me if you have any questions.
I can have you process the crystalline salts properly
We can obtain the well-crystallized by-product salts
Is there a way to first remove the organic substances inside and reuse them, while dealing with the salts?
Salinity can be reduced by trying multi-effect evaporation, or by using reverse osmosis, which can also lower the salt content.