Direct-flow biological nitrogen removal sewage treatment method
A sewage treatment method and biological denitrification technology, applied in the field of sewage treatment, can solve the problems affecting the total removal efficiency of ammonia nitrogen, etc., and achieve the effect of saving power consumption and operating costs
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Embodiment 1
[0011] Embodiment 1, once-through biological denitrification sewage treatment method, NH 3 -The full flow of sewage with a N concentration of 30mg / l flows from the primary aerobic pool at the beginning to the anoxic pool in sequence, then flows into the secondary aerobic pool at the terminal and is discharged without backflow in the middle, and the dissolved oxygen concentration in the primary aerobic pool is >5mg / L, the removal rate of BOD53 The -N content is 2.5 mg / l, and the denitrification rate is 91.7%.
Embodiment 2
[0012] Embodiment 2, reference example 1, NH in the influent sewage 3 - The concentration of N is 40mg / l, the input volume of the biological mass in the anoxic pool is 50% of the effective volume of the anoxic pool, and the hydraulic retention time distribution of the primary aerobic pool, the anoxic pool, and the secondary aerobic pool The ratio is 1.5:5:3.5, NH in the effluent 3 The -N content is 2.7 mg / l, and the denitrification rate is 93.3%.
Embodiment 3
[0013] Embodiment 3, reference example 1, NH in the influent sewage 3 -N concentration is 45mg / l, the input volume of the biomass in the anoxic pool is 60% of the effective volume of the anoxic pool, and the hydraulic retention time distribution of the primary aerobic pool, the anoxic pool, and the secondary aerobic pool The ratio is 1.8:5:3.2, the first aerobic pool and the second aerobic pool also put biological mass, the volume of the biological mass in the first aerobic pool is 50% of the effective volume of the first aerobic pool, and the second The volume of biomass put into the aerobic pool is 60% of the effective volume of the secondary aerobic pool, and the NH in the effluent 3 The -N content is 2.5 mg / l, and the denitrification rate is 94.5%. .
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