A method for adjusting biological nitrogen and phosphorus removal by using concentration gradient
A concentration gradient, biological denitrification technology, applied in chemical instruments and methods, sustainable biological treatment, water treatment parameter control, etc. , Adjust the biological nitrogen and phosphorus removal and other issues to achieve the effect of ensuring the dosage of the agent and the air volume of the fan
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Embodiment 1
[0117] The designed treatment capacity of an industrial wastewater plant is 160,000 tons / day, and the actual treatment capacity is 125,000 tons / day; the process route is pre-coagulation + hydrolytic acidification + anaerobic / anoxic / aerobic + MBR + ozone contact oxidation + post-mixing Coagulation precipitation. The internal reflux ratio from the aerobic pool to the anoxic pool is 200%, and the external reflux ratio from the anoxic pool to the anaerobic pool is 200%. There is no need to add carbon sources on site, and the air volume of the fan in the aerobic pool is 555m3 / min, the TN concentration effluent discharge standard is 15mg N / L, and the TP concentration effluent discharge standard is 0.3mg P / L. After the on-site biological phosphorus removal, the biochemical tank MBR needs to add polyaluminum chloride PAC to the post-coagulation sedimentation tank and ferric chloride FeCl 3 After further in-depth chemical phosphorus removal, the total phosphorus concentration in the e...
Embodiment 2
[0127] A printing and dyeing water plant treats 15,000 tons of water per day. The process route is pre-coagulation + hydrolytic acidification + anoxic / aerobic + secondary sedimentation tank + ozone contact oxidation. The internal reflux ratio from the aerobic tank to the anoxic tank is 600%, and the external reflux ratio from the secondary sedimentation tank to the anoxic tank is 160%. Glucose dosage is 120mg / L in the anoxic tank on site, and the aerobic tank runs the fan Air volume 56m 3 / min, the TN concentration effluent discharge standard is 15mg N / L, and the actual TN concentration of the effluent on site is 16-20mg N / L, which cannot meet the standard.
[0128] According to the method described in the present invention:
[0129] (1) In the anoxic pool, the DO concentration is detected at the backflow inlet, 1 / 10, 1 / 5, and 1 / 2 of the anoxic pool along the water flow direction. Detect the pH, COD concentration, TN concentration and nitrate nitrogen concentration of the su...
Embodiment 3
[0137] A chemical wastewater plant treats 10,000 tons per day. The process route is Fenton + hydrolytic acidification + anoxic / aerobic + MBR + ozone contact oxidation + high-efficiency sedimentation tank. The internal reflux ratio from the aerobic tank to the anoxic tank is 400 %, glucose is added to the anoxic pool on site as a carbon source; the air volume of the fan is 61m 3 / min, the TN concentration effluent discharge standard is 15mg N / L, and the actual TN effluent concentration on site is 16-18mg N / L, which cannot meet the standard.
[0138] According to the method disclosed in the present invention:
[0139] (1) The concentration of DO was detected at the inner return water inlet of the anoxic pool along the water flow direction, 1 / 10, 1 / 5 and 1 / 4 respectively, and at the same time, at the water inlet of the anoxic pool Detect pH at 1 / 2, 3 / 4 and the end along the water flow direction, TN concentration, COD concentration and nitrate nitrogen concentration of the supern...
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