Treatment of wastewater from resin column regeneration
Thread Content
This post was last edited by sunjl1981 on 2013-1-6 at 21:39. As we all know, various types of wastewater are generated during the exchange and regeneration of resins. I would like to ask how different factories handle the wastewater produced during acid-base regeneration? Can it be recycled? # hcbbs
This post was last edited by jjf278204 on 2010-1-22 08:56. Currently, alkaline wastewater is generally recycled to produce salts, while acidic wastewater is treated before being discharged. My feeling is exactly the opposite of the reality; I believe that acidic wastewater consists of cationic impurities, and it does not easily accumulate in the system after reuse, so it can be reused. Alkaline water contains anions such as bromine and iodine, which tend to accumulate; it should be reused appropriately.
We have no experience in recycling, and we hope everyone can provide a feasible solution. We also want to carry out recycling, as waste is severe and it incurs costs for wastewater treatment. Thank you!
Recycling is difficult; alkalis can be converted into salts, but with such a low concentration of acids, it’s hard to handle them
Personal opinion: Acid-base return water can be used for dechlorination; acidic water can be mixed with chlorine water and then fed into the dechlorination tower； Reusing alkaline water is rather troublesome; it’s best to install a high-level tank, and add alkali to the dechlorination tower from this tank.
At present, the partially regenerated acid-base wastewater is neutralized and then fed into the primary brine stage for salinization
We don’t need any of that; the levels of ions such as calcium, magnesium, and iron in the second-stage brine are already high, and using it for salt production would make things even worse.
Collect the acidic and alkaline water in a wastewater recovery tank first; after circulation, send it to the brine mixing tank.
Compared to the calcium and magnesium contained in crude salt, the calcium and magnesium in the regenerated waste acid and alkali are much lower.
To date, the wastewater treated by the chelating resin columns I have designed has mostly been alkaline or neutral wastewater, which is recovered for salt production; acidic wastewater, on the other hand, is discharged after treatment. The reason why acidic wastewater cannot be recycled is that it contains heavy metal ions, which tend to accumulate in the system and are difficult to remove. In addition to dissolving salts, alkaline and neutral water can also be sent to the dechlorination unit for pH adjustment of the resulting fresh water; of course, there is also a pipeline for adding 32% alkaline solution.
After mixing, an alkali or acid is added according to the pH value for neutralization; thereafter, it is pumped to the brine section for salt production