a for sewage treatment 2 o Nitrogen and phosphorus removal device and method
A sewage treatment method, nitrogen and phosphorus removal technology, applied in the field of water treatment, can solve the problems of interfering with the phosphorus release reaction in the anaerobic stage, affecting the phosphorus removal efficiency, and unable to completely solve the contradiction of sludge age, so as to reduce energy consumption and achieve high dephosphorization The effect of nitrogen rate
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Embodiment 1
[0053] refer to figure 1 , the embodiment of the present invention provides a kind of A for sewage treatment 2 O denitrification and phosphorus removal method, comprising the following steps:
[0054] S1: The sewage with 80% of the incoming water flow enters the pre-anoxic zone in the anaerobic tank, and the anaerobic reaction is carried out in the anaerobic tank, so that the organic nitrogen in the sewage is converted into ammonia nitrogen, and phosphorus is released in the anaerobic stage;
[0055] S2: discharging the anaerobic treated sewage in step S1 into the aerobic tank A to provide conditions for the obligate aerobic phosphorus accumulating bacteria to over-absorb the dissolved phosphorus, and at the same time use the nitrifying bacteria supplemented by the sedimentation tank B to carry out nitrification;
[0056] S3: the sewage after the nitrification treatment in step S2 is discharged into the sedimentation tank A, and the sewage is in the sedimentation tank A to co...
Embodiment 2
[0066] Similar to Example 1, the difference is that: the sectional water inflow is 90% in the anaerobic section and 10% in the anoxic section, the return ratio of phosphorus removal sludge in sedimentation tank A is Ra = 80%, and the sludge concentration in the anoxic tank is X = 5g / L control, the mixed liquid reflux ratio in aerobic tank B is controlled according to Ri=50%, and the ratio of sludge return from sedimentation tank B to aerobic tank A and anoxic tank is Rb1=20% and Rb2=30%, respectively. The number of days for controlling the sludge age of each section is as follows: the sludge age of phosphorus accumulating bacteria in the anaerobic and aerobic section is controlled by 5 days, and the sludge age of denitrification and nitrification bacteria in the anoxic and aerobic section is controlled by 15 days.
[0067] The method of this example can remove 90% of phosphorus through the anaerobic and aerobic system in the previous stage; because the aeration of the aerobic t...
Embodiment 3
[0069] Similar to Example 1, the difference is that: the sectional water inflow is 90% in the anaerobic section and 10% in the anoxic section, the return ratio of phosphorus removal sludge in sedimentation tank A is Ra = 80%, and the sludge concentration in the anoxic tank is X = 5g / L control, the mixed liquid reflux ratio in aerobic tank B is controlled according to Ri=50%, and the ratio of sludge return from sedimentation tank B to aerobic tank A and anoxic tank is Rb1=40% and Rb2=60%, respectively. The number of days for controlling the sludge age of each section is as follows: the sludge age of phosphorus accumulating bacteria in the anaerobic and aerobic section is controlled by 5 days, and the sludge age of denitrification and nitrification bacteria in the anoxic and aerobic section is controlled by 15 days.
[0070] The method of this example can remove 90% of phosphorus through the anaerobic and aerobic system in the previous stage; because the aeration of the aerobic t...
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