Why can’t the total nitrogen level in the effluent from the AAO process be reduced?
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In the AAO process, the total nitrogen level in the raw water is 136; after passing through the aerobic tank, it drops to 88. After going through the sedimentation tank, it becomes 61, and after the air flotation tank, it remains at 60. The total nitrogen level in the effluent is still 60. Why is it so high? My local standard for total nitrogen emissions is 60, and we are almost exceeding this limit! However, the ammonia nitrogen level in the effluent is 5.9, COD is 98, and total phosphorus is reduced to 3.2 through the use of chemicals. I hope experts can help solve this problem! Thank you
It would be best to provide the values of BOD5 in the influent water and COD in the effluent water. Total TN is mainly removed during the denitrification stage; since you are using an AA/O process, increase the recirculation rate, and make sure that the anoxic stage is sufficiently long
What is the reflux ratio? Is the carbon source sufficient?
Due to the limitations of the process itself, the A/A/O process does not achieve thorough nitrogen and phosphorus removal