Denitrification efficiency of A/O process
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In a single-stage A/O process system, the nitrogen removal efficiency follows the formula: Nitrogen removal efficiency = Internal recirculation ratio / (1 + Internal recirculation ratio); in other words, the higher the internal recirculation ratio, the greater the nitrogen removal efficiency； Is it true that the higher the internal recirculation level, the better, and the more thorough the nitrogen removal?
It can’t be generalized; it’s sufficient to stop at an appropriate point. It’s impossible to completely remove *ao acid nitrogen, and doing so would have the opposite effect； Generally, we keep the nitrogen removal rate of *ao acid below 80%, that is, with a reflux ratio between 200–400%, the denitrification efficiency can still be ensured.
The denitrification efficiency is also related to the C/N ratio; it decreases significantly when the C/N ratio is less than 4.
When the organic load in the aerobic tank is too high, the growth and reproduction of nitrifying bacteria are suppressed, preventing them from fully oxidizing ammonia nitrogen to nitrate. As a result, the denitrification efficiency drops significantly, as there are no nitrates available for denitrification in that stage.
When the organic load in the aerobic tank is too high, the growth and reproduction of nitrifying bacteria are suppressed, preventing them from fully oxidizing ammonia nitrogen to nitrate. As a result, the denitrification efficiency drops significantly, as there are no nitrates available for denitrification in that stage.