Efficient denitrification method for aerobic granular sludge
An aerobic granular sludge, high-efficiency technology, applied in chemical instruments and methods, water/sludge/sewage treatment, aerobic and anaerobic process treatment, etc., can solve the problem of low nitrogen removal efficiency of aerobic granular sludge , to achieve the effect of increasing the removal rate of phosphorus, improving the efficiency of nitrogen removal, and improving the removal rate
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Embodiment 1
[0028] An aerobic granular sludge high-efficiency denitrification method uses an SBR reactor for wastewater treatment, and the configuration of the SBR reactor is a single-stage SBR reactor. The operation mode of the SBR reactor includes five modes: water inflow, aerobic reaction, anoxic / anaerobic reaction, sedimentation and drainage.
[0029] The above-mentioned high-efficiency denitrification method for aerobic granular sludge comprises the following steps:
[0030] S1. Pre-preparation: inoculate the SBR reactor with nitrifying granular sludge, the concentration of nitrifying granular sludge is 5500 mg / L, and the relative abundance of aerobic ammonium oxidizing bacteria in the nitrifying granular sludge is above 30%.
[0031] S2. Operation: start the SBR reactor, the SBR reactor enters the water inlet mode, the wastewater to be treated enters the SBR reactor, the water quality indicators of the inlet water: the ammonia nitrogen concentration is about 220mg / L, the TP is about...
Embodiment 2
[0041] The difference between this embodiment and Embodiment 1 is that in this embodiment, the water quality index of the influent: the concentration of ammonia nitrogen is about 220 mg / L, the TP is about 12 mg / L, and the pH value is 9.5; When adding the denitrifying bacteria solution, the ratio of the dosage of the denitrifying bacteria solution to the water inflow is 2.5mL / L.
[0042] Aiming at the high-efficiency denitrification method of aerobic granular sludge in this example, the conversion form of nitrogen in the water body and the pH value of the water body were monitored, and the results were as follows figure 2 shown. In addition, several time nodes were selected to show the transformation forms of nitrogen in the water body, and the results are shown in Table 2.
[0043] Table 2 Conversion forms of nitrogen in water at each time point
[0044]
[0045]
Embodiment 3
[0047] The difference between this example and Example 1 is only that: in this example, the dosage of methanol satisfies the condition that the C / N ratio of methanol to water body TN is 2.0; when switching the operating mode of the SBR reactor, In the anoxic / anaerobic reaction mode, when the pH value of the water body changes less than 0.5 within 10 minutes, the anoxic / anaerobic reaction mode is switched to the aerobic reaction mode.
[0048] Aiming at the high-efficiency denitrification method of aerobic granular sludge in this example, the conversion form of nitrogen in the water body and the pH value of the water body were monitored, and the results were as follows image 3 shown. In addition, several time nodes were selected to show the transformation forms of nitrogen in water, and the results are shown in Table 3.
[0049] Table 3 Conversion forms of nitrogen in water bodies at each time point
[0050] time (min) NH 4 + -N (mg / L)
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