How can the waste hydrochloric acid and waste alkaline solutions generated after the regeneration of the chelating resin column be reused?
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Chelating resin columns use 4-6% dilute hydrochloric acid and 4-6% dilute alkaline solutions during regeneration, and this process generates large amounts of acidic and alkaline wastewater. How to reuse it economically? I saw someone on the forum say that after neutralization, it is sent for desalination. If neutralized, the value of acids and bases is not fully utilized. Some people also say that special acid- and alkali-resistant membranes can be reused for the next regeneration process. Alkaline solutions are expensive, so ordinary stainless steel equipment is sufficient. But hydrochloric acid is inexpensive, and ordinary stainless steel used in equipment, or even duplex steel and titanium materials, cannot resist hydrochloric acid. How is this achieved? Is there a more economical method that makes better use of the acid-base value?
For that acidic water, you can just use fiberglass, right? Here, all the waste acidic water is used for dechlorination
The regenerated waste acid contains a large amount of calcium and magnesium ions, which are used for dechlorination – isn’t this introducing the calcium and magnesium that were painstakingly removed back into the system?
Acidic wastewater is sent to the process for producing industrial hydrochloric acid, while alkaline wastewater is returned to the brine mixing tank
Previously, our facility would return the waste alkaline water back to the primary brine system, while the waste acidic water was discharged directly; however, considering the wastewater treatment system now, both acidic and alkaline waters are discharged continuously 24 hours after being neutralized.
The neutralization and salt recovery of acid and alkali wastewater has been carried out in this way for many years with no problems.
I mean neutralization to form a salt; in this process, both the acid and the base are wasted, failing to achieve their maximum potential. If you do the math, it’s quite a lot of money for this one year!
There are advantages and disadvantages, but until a better solution is found, this approach is still better than dumping the wastewater – it does not pollute the environment and makes full use of that wastewater. If the cost of treatment is higher than that of neutralization, then why go to the trouble of investing in it?
Do you use this acid water to make hydrochloric acid? Has it no impact on the falling film absorber? Could you please introduce your manufacturing process?
There is no problem using hydrochloric acid as the absorption solution; just make sure to calculate that the area of the absorber is sufficient
Reasonable use – good. Can it be adjusted?