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[Community case] The influent COD is more than 300, and the ammonia nitrogen is more than 100.
The author, Fatty Yan, has written a lot of articles on ammonia nitrogen and TN before.
1.
1.
Solution: According to the CN ratio of 4 to 6, add carbon source
2.
2.
Solution: increase the internal reflux ratio r to 200-400% (some denitrification processes combine internal and external reflux, and the internal and external reflux ratio should also be controlled within this range.
3.
3.
Solution:
1.
2.
4.
4.
Solution:
1.
2.
5.
5.
The denitrification efficiency is too high
In the design specification, the denitrification efficiency is generally 60-85%.
In the problem, the denitrification efficiency of the first-level AO has exceeded 90%, which is very good for municipal sewage, but in the process wastewater with high ammonia nitrogen, TN is required to reach Level A is a bit too strong for level AO craftsmanship
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Solution:
It is solved by the process of two-level or multi-level AO
.
6.
N-containing heterocyclic organic nitrogen
N-containing heterocyclic organic nitrogen
Some nitrogen-containing organic compounds cannot be destroyed by ordinary biochemistry, resulting in inability to remove them.
This situation is relatively rare, mainly for a certain type of wastewater.
The process of converting nitrogen to ammonia nitrogen)
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Solution:
1.
Increase the pretreatment of hydrolysis and acidification
.
2.
If the hydrolysis and acidification cannot break the ring, increase the advanced oxidation pretreatment
.