What causes the increase in ammonia nitrogen in the anaerobic tank?
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The ammonia nitrogen level is around 8 before entering the anaerobic tank; it rises to 14 after exiting the anaerobic tank. Does the ammonia nitrogen level increase inside the anaerobic tank?
Under normal conditions, part of the total nitrogen is ammoniated into ammonia nitrogen.
Since the anaerobic process involves ammonification in the fermentation tank, microorganisms break down organic nitrogen compounds and convert them into ammonia nitrogen; as a result, the ammonia nitrogen level in the anaerobic effluent is high. Meanwhile, COD is degraded due to the action of microorganisms. The presence of ammonia nitrogen generated during the anaerobic process causes the pH to rise naturally.
Apart from the issues mentioned on the 2nd and 3rd floors, does the wastewater handled by the original poster contain sulfate ions? It is converted into hydrogen sulfide in the anaerobic section, interfering with the ammonia nitrogen detection results.