How to reduce COD and color in concentrated acid wastewater
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The company currently has waste sulfuric acid in its production process; its concentration is between 60% and 70%, the COD level is between 10,000 and 15,000, and it is black in color. This black color is due to the carbonization that occurs when concentrated sulfuric acid reacts with small organic molecules. Is there any effective method for treating this waste? Or it has a transparent brown color with a COD of around 3000 – how is this wastewater best treated?
Sent to the coking plant for the production of sulfuric acid AN
Sulfuric acid with a concentration of less than 70% no longer possesses oxidizing properties, and it is difficult to remove the organic substances present in it, including carbides, in the absence of an oxidant. It is recommended to add an appropriate amount of nitrates and raise the temperature slightly, which can remove a small amount of organic matter from sulfuric acid; however, a small amount of sulfates and nitrates will remain in the sulfuric acid.
It seems there are relatively few coking plants in Zhejiang
Now, by adding hydrogen peroxide to the black wastewater, we can reduce the COD to 2000–3000, and the color can be reduced to a transparent tea-colored shade; however, the acid concentration remains at 60–70%, and it becomes difficult to treat further.
This is generally how it’s handled; oxidants such as ** can also be used, but the cost is too high and it’s not worth it. We studied this in the past
The current treatment cost using hydrogen peroxide is 186 yuan per cubic meter. The management wants to find out if there are any wastewater treatment plants available, or any methods for treating it.
The treated waste acid is not worth this price either; it’s best to give it to coking plants, where it can be separated into organic substances
It is possible to consider first filtering out the suspended solids from the water, and then using resin for decolorization and to treat the COD. If needed, I can send you some materials to take a look at; we can learn from each other
Is this acid still available? I can purify it to be almost colorless and transparent. 13583319161
Flocculation, cracking, decolorization, 13583319161