How to treat strong alkaline wastewater?
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Environmental regulations are becoming increasingly strict. A type of strong alkaline waste liquid with a pH of 13 used to be discharged directly, but now it is required to be discharged in compliance with standards. What is the best method to use?
Direct discharge? My buddy’s company is way too reckless; it would be better to neutralize the substances, carry out evaporation and desalination, so as to ensure emissions meet the standards!
It’s mainly a KOH solution; what is the best substance to use for neutralization? Save money, be efficient.
Salt acid is the cheapest, but the KCl produced still needs to be evaporated and recovered.
Thank you to the moderator; I’ll test it again later. I’ll come back and report the results
See if it can be recycled. If acid is used for neutralization, it’s necessary to consider whether it is cost-effective
It can be mixed with other wastewater and directly reused in the circulating water system to achieve zero wastewater discharge.
It’s necessary to first determine the composition of the other wastewater; otherwise, mixing them randomly could have the opposite effect.
Wastewater from which industry? In the case of a simple alkaline solution, acid can be added directly for neutralization, ensuring that the pH remains between 6 and 9. If there are other restrictions on emission standards, treatment processes must be developed in accordance with those emission requirements
With such strong alkaline water, the concentration of potassium hydroxide is likely worth recovering, or potassium salts can also be recovered. Conduct a compositional analysis of the wastewater to see if an appropriate treatment method can be found. Let’s not rush to neutralize the emissions with acid for now. If the potassium ion concentration reaches 3 g/L, this is already higher than the potassium content in ordinary salt lakes.
Thank you to all fellow sailors for your generous help! It is waste liquid from the printing industry; its main components are 90% water, 2% potassium hydroxide, 2% sorbitol, along with a large amount of diazo photosensitive emulsion. It is waste liquid, and it is required to be treated to meet discharge standards. The indicators for industrial wastewater discharge include COD, BOD, ammonia nitrogen, etc.