Absorbing the stripping off-gases from ammonia-containing wastewater with sulfuric acid
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Sulfuric acid is used to absorb the stripping off-gases from ammonia-containing wastewater; the ammonia nitrogen concentration in the wastewater is 5000–6000 mg/L. What is the appropriate concentration of the sulfuric acid solution to be used? Please advise.
What LZ said is incorrect; the ammonia stripping method transfers the ammonia nitrogen in the liquid to the gas phase. However, LZ did not explain what the actual efficiency of this process is. To absorb the ammonia-containing exhaust gases, concentrated sulfuric acid is generally used.
This is somewhat similar to the method of using ammonia to absorb SO2 from flue gas. Washing can be carried out using 3–5% dilute sulfuric acid. However, the resulting sulfuric acid an is difficult to recycle.
I still prefer concentrated sulfuric acid, as it allows for the recovery of sulfuric acid AN, is less likely to become saturated, and thus reduces the complexity of management.