A method for rapidly restoring the activity of anammox bacteria inhibited by dissolved oxygen
An anammox bacteria and anaerobic ammonium oxidation technology, applied in the direction of anaerobic digestion treatment, chemical instruments and methods, aerobic and anaerobic process treatment, etc., can solve the problem of long activity lag period, poor recovery degree and long time and other issues, to achieve the effect of reducing the activity lag period, good cost-benefit ratio, and improving performance
Active Publication Date: 2021-09-03
TONGJI UNIV
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Problems solved by technology
This method can overcome the long time required for the natural recovery of anammox bacteria after being inhibited by dissolved oxygen, and the recovery degree is poor. In the integrated "short-cut nitrification-anammox" process, there may be a long activity lag period.
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Embodiment 1-8
[0026] First take 500ml of anaerobic ammonium oxidation sludge, and set the dissolved oxygen concentration in the first stage, the dissolved oxygen concentration in the second stage and the dosage of zero-valent nano-iron in the third stage as shown in Table 1.
[0027] Wherein, the dosage of zero-valent nano-iron in the third stage of embodiment 1 and 5 is 0, in embodiment 2,3,4 and 6,7,8, the dosage of zero-valent nano-iron is respectively 5 (mg / L), 25(mg / L), 75(mg / L).
[0028] The dissolved oxygen concentration in the second stage in Examples 1 to 4 is 0.2 (mg / L), and the dissolved oxygen concentration in the second stage in Examples 5 to 8 is 2.0 (mg / L).
[0029] Other process conditions are the same.
[0030] Table 1, the dosage and dissolved oxygen concentration of zero-valent nano-iron in Examples 1-8.
[0031]
[0032] The anammox sludge was obtained from the existing anammox sludge in our research group. Measure the volatile suspended solids concentration of thi...
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The invention relates to a method for rapidly restoring the activity of anammox bacteria inhibited by dissolved oxygen, and belongs to the technical field of sewage treatment. First take the anaerobic ammonium oxidation sludge whose activity has decreased after being inhibited by dissolved oxygen, put it in the reactor, adjust the pH to 7.2–7.3, and the temperature is 35±1°C. Then, seal the reactor to prevent air from continuously entering the reactor, according to the dissolved oxygen concentration in the previous step, add 5–75 (mg / L) zero-valent nano-iron to the reactor, and monitor through the dissolved oxygen meter , when the dissolved oxygen in the anammox sludge is completely removed, the activity of the anammox bacteria is restored. Compared with restoring the activity of anammox bacteria by aeration of nitrogen, the present invention can increase the activity of anammox bacteria by about 33% by adding a small amount of zero-valent nano-iron, and the denitrification effect is improved, which has a better cost-benefit ratio . The invention is suitable for rapid recovery of the activity of the anammox bacteria after being inhibited by higher dissolved oxygen.
Description
technical field [0001] The invention relates to a method for rapidly recovering the activity of anaerobic ammonia oxidizing bacteria inhibited by dissolved oxygen. The invention belongs to the technical field of quickly restoring the activity of anammox bacteria in sewage treatment. Background technique [0002] Anaerobic ammonium oxidation (Anammox) bacteria can use ammonia nitrogen as an electron donor and nitrite as an electron acceptor in the absence of dissolved oxygen to convert it into nitrogen at a ratio of 1:1.2. The reaction formula is : NH 4 + +1.32NO 2 – →N 2 +0.26NO 3 - +2H 2 O. Based on this biochemical characteristic, the researchers proposed to apply anammox bacteria to the field of sewage treatment. Since the anaerobic ammonium oxidation reaction does not require the participation of molecular oxygen, there is no need for aeration, which can save energy for feeding. At the same time, since the anammox bacteria are chemoautotrophs, this technology ...
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IPC IPC(8): C02F3/30C02F3/28
CPCC02F3/28C02F3/307
Inventor 王亚宜闫媛马骁王伟刚
Owner TONGJI UNIV