Sewage treatment method capable of adjusting nitrogen and phosphorus removal capacity
A sewage treatment method and adjustable technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, water treatment parameter control, etc., can solve difficult control, affect nitrification function, and create conditions for denitrification and phosphorus removal And other issues
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Embodiment 1
[0069] Sewage flow Q is 100000m 3 / d, is domestic sewage, the average influent water is ammonia nitrogen 45mg / L, TN55mg / L, TP6mg / L, BOD160mg / L, the effluent standard is ammonia nitrogenfigure 1 the device.
[0070] The residence time of the pre-anoxic zone (PreA) is 0.5h, the residence time of the anaerobic zone (AP) is 2.0h, the residence time of the middle sink zone (S1) is 2.5h, and the residence time of the effluent zone (CS) is 0.5h; aerobic nitrification The residence time of the zone (ON) is 2.5h, and the specific surface area is 800m 2 / m 3 Suspended carrier with a filling rate of 50%; the residence time of the aerobic decarburization zone (OC) is 0.5h, and the specific surface area is 800m 2 / m 3 Suspended carrier, the filling rate is 30%; the residence time in the denitrification zone (ANP) is 4.5h; the total residence time is 13.0h.
[0071] The system adopts the operation mode beyond sludge, the sludge concentration in the aerobic nitrification zone (ON) is 0.3...
Embodiment 2
[0075] Example 1 ran to 300 days, encountered the impact of the influent water quality, the influent water quality changed greatly, the influent BOD reached 200mg / L, and the mean values of other indicators did not change much. At this time, the DO in the aerobic nitrification zone (ON) was 5.5-6.0 mg / L, the ammonia nitrogen at the effluent end of the aerobic nitrification zone (ON) was 4.5mg / L and still >3mg / L, the total effluent ammonia nitrogen increased from <1mg / L to 3.5mg / L, and switched to the reflux nitrification liquid operation mode;
[0076] When the reflux nitrifying liquid operation mode, the sludge age of the suspended sludge in the system increases to 12-15d; the inflow flow rate is Q, the flow rate of the main water inlet pipe (P1) is 80%-90%Q, and the sludge return pipe (P5) ) flow rate is 70%-90%Q, the flow rate of the sludge overrun pipe (P4) is 200%Q; the DO in the aerobic nitrification zone (ON) is 4.0-6.0mg / L, and the DO in the aerobic decarbonization zon...
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