Treatment of sodium hydroxide hydrogen oxide wastewater
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During each batch of the reaction process, the company adds 1700 kg of 50% NaOH. Approximately 6000 kg of wastewater containing 14–15% NaOH is generated (water is added during the reaction), and this wastewater also contains a small amount of organic substances that need to be treated. There are currently two methods for handling this wastewater: 1) Adding sulfuric acid to neutralize it, resulting in a sodium sulfate solution, followed by the evaporation of the sodium sulfate crystals; however, this method requires high energy consumption and incurs high costs； 2. Evaporate and concentrate the 15% NaOH wastewater to 50% for reuse, but there is concern that this may affect the reaction. Do any of you experts have any good suggestions?
I’m not sure what this reacts with; our facility produces alkaline sludge as a byproduct of liquefied gas desulfurization, and it’s causing quite a problem at the moment – we don’t know what to do with it. These are all long-standing challenges for factories! ! ! !
The membrane method is used to purify and recover sodium hydroxide; the quality of the recovered sodium hydroxide is identical to that of the originally prepared sodium hydroxide, and it can be reused after being concentrated. This technology is already quite mature.
Both membrane technologies can be used for treatment. 1. NF membrane filtration with alkali resistance is used; after filtration, the liquid is evaporated and concentrated to obtain a high-concentration alkali solution. However, it’s not known whether there are other ions present in the original solution. Additionally, organic matter may contaminate the membrane. Furthermore, NF membrane filtration cannot achieve complete recovery. 2. Using alkali-resistant ED membranes for caustic soda recovery allows for almost complete recovery, but it is still necessary to know the ion composition of the original solution. Additionally, the issue of alkali corrosion of the membrane must be considered.
I heard that membrane treatment is very expensive, right?
Do your reaction vessels operate continuously or intermittently? How many hours do they run per day, and how much water is produced? You should know whether the organic substances produced have an impact on your reactions. Our company offers a system with low evaporation energy consumption and intermittent operation; if the organic substances produced pose no issue, you might want to give it a consideration.
Due to the presence of other impurities, it cannot be reused and must be disposed of
It’s a batch reaction; unfortunately, organic substances have an impact. It seems that the only options are to carry out neutralization treatment or try to sell it
Are they small-molecule impurities or large-molecule impurities? Macromolecular impurities are separated from the recovered alkaline solution
Could the original poster explain in detail the approach to tackling the recycling-related questions? Or we can talk about it separately as well! ! ! !
Was the problem solved? We have handled many cases related to alkali recovery; if you need them, I can send you some materials