I would like to ask about the methods for treating sodium hydroxide wastewater
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One of our company’s reaction systems involves adding 1,700 kg of 50% NaOH per batch during the reaction process. Approximately 6,000 kg of wastewater containing 14–15% NaOH is generated (water is added during the reaction), along with a small amount of organic matter. There are two existing methods for treating this wastewater: 1) Adding sulfuric acid to neutralize it, resulting in a sodium sulfate solution, which is then evaporated to obtain sodium sulfate crystals; however, this method requires high energy and incurs high costs； 2. Evaporate and concentrate the 15% NaOH wastewater to 50% for reuse, but there is concern that organic substances may affect the reaction. Do any of you experts have any good suggestions?
Sell it; sell it to units that carry out flue gas desulfurization, as this concentration is suitable for such purposes
Disposing of such high concentrations as waste is indeed a waste. If the original poster has the means, they can conduct some experiments to determine whether organic substances have an impact on the reaction products. By using the first batch of wastewater to prepare the alkaline solution, it is possible to reuse part of that alkaline solution
Yes, it’s necessary to conduct experiments. If organic substances have no effect, it is possible to prepare the solution for reuse
The master is right; if it’s truly necessary to use acid for neutralization, it’s better to sell it as waste alkali
Where are you from? My company is facing the same problem as yours, and we don’t have any good solutions either; I hope an expert can offer some guidance! ! ! ! ! ! ! ! ! !
That counts as hazardous waste, and the legal representative wouldn’t dare take that risk.
It doesn’t seem easy to sell it. Does anyone know which organizations might be interested in it? Putting money in is also an option
If you are in Sichuan, you can contact me within the platform.
See, am I right? There’s already someone who wants it