In the AO process, the ammonia nitrogen level in the system rises suddenly and rapidly
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Operation was normal throughout the summer. Starting at the end of October and beginning of November, the ammonia nitrogen level in the effluent from the aerobic stage began to rise, going from below 1 to 70 at present. There have been basically no changes in the process controls: the settling ratio is around 50%, dissolved oxygen levels are between 3 and 5, the pH value is 8.2, and the recirculation ratio is 200%. I seek guidance from experts on how to make adjustments.
What is the DO in Pool A? Also, has the temperature in Pool A dropped significantly?
The dissolved oxygen level in Pool A is between 0.2 and 0.4, while the temperature has dropped from 28 degrees to around 19 degrees. Measures have been taken to increase the recirculation ratio, raise the sludge concentration, and elevate the temperature of the regulating tank to 25 degrees.