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    Home > Chemicals Industry > Chemical Technology > Ammonia nitrogen is very low, what should I do if TN cannot go down?

    Ammonia nitrogen is very low, what should I do if TN cannot go down?

    • Last Update: 2022-04-28
    • Source: Internet
    • Author: User
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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.


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    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.


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    Solution:

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    Solution:

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    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
    .

    Solution:

    It is solved by the process of two-level or multi-level AO
    .

    6.
    N-containing heterocyclic organic nitrogen

    6.
    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)
    .

    Solution:

    1.
    Increase the pretreatment of hydrolysis and acidification
    .

    2.
    If the hydrolysis and acidification cannot break the ring, increase the advanced oxidation pretreatment
    .

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