Under what conditions can sulfuric acid produce hydrogen sulfide?
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In the sulfuric acid neutralization tank, which is used to neutralize waste sulfuric acid with sodium hydroxide, there is a smell of rotten eggs; it is suspected that this is hydrogen sulfide. But how could there be hydrogen sulfide?
There will be no hydrogen sulfide in sulfuric acid, because hydrogen sulfide does not dissolve easily or remain stable in acidic solutions. It may be caused by a small amount of sulfur-containing compounds in the alkali used during alkalization, which release hydrogen sulfide when it comes into contact with acid.
It seems the analysis on the second floor is correct. However, when anaerobic processes such as UASB (Upflow Anaerobic Sludge Bed reactor) are used to treat wastewater containing sulfate ions, H2S gas can be produced with the involvement of microorganisms.