CANON-MBBR enhanced AOA water treatment method and system based on BFM form

Abstract

The invention discloses a CANON-MBBR enhanced AOA water treatment method and a CANON-MBBR enhanced AOA water treatment system based on a BFM form, and belongs to the technical field of sewage treatment. The method comprises the following steps: sewage to be treated enters an anaerobic zone, and effluent of the anaerobic zone enters a carbon enrichment zone; supernate obtained in the carbon enrichment area enters the autotrophic MBBR area, and obtained sludge is discharged from an outlet end at the bottom of the carbon enrichment area and is conveyed to the aerobic IFAS area through a pipeline connected with a sludge overrunning pump; the effluent of the aerobic IFAS zone enters the anoxic zone, and the effluent of the anoxic zone enters the secondary sedimentation zone. The autotrophic MBBR area serves as a nitrification and denitrification main body, it is guaranteed that the ammoxidation rate is 80-90%, the aerobic IFAS area conducts targeted removal on a small amount of ammonia nitrogen carried by effluent of the autotrophic MBBR area and part of ammonia nitrogen caused by sludge exceeding, and the method has the advantages of being excellent in denitrification effect and nitrification effect, high in impact resistance, small in occupied area and the like.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a CANON-MBBR enhanced AOA water treatment method and system based on the BFM form. Background technique [0002] With the proposal of the domestic dual-carbon target, the demand for energy saving and consumption reduction in sewage treatment continues to increase. The AOA process utilizes a lower aerobic / anoxic tank capacity ratio and reduces the consumption of the internal carbon source in the aerobic tank through a smaller aerobic residence time; on the other hand, it also ensures sufficient denitrification tank capacity , when the influent C / N is low, the anoxic tank uses the PHA synthesized in the anaerobic stage, which can ensure a higher denitrification efficiency through the endogenous denitrification effect, and can ensure a higher biological removal efficiency through denitrification and phosphorus removal. Therefore, the demand for external carbon sources for ...

AI Technical Summary

Problems solved by technology

First of all, the common AOA process still relies on the traditional nitrification and denitrification process technology, and the denitrification effect is still greatly affected by the C / N of the raw water. When the sedimentation effect of the liquid separation tank is poor, on the one hand, the SS of the effluent supernatant is high, which will affect the nitrification effect of the subsequent nitrification tank, resulting in the deterioration of the nitrification effect of the nitrification tank, and a higher sludge surpassing ratio. In order to meet the ammonia nitrogen load in the oxygen pool, it is necessary to increase the reflux ratio between the aerobic pool and the anoxic pool to meet the nitrification effect; thirdly, the nitrification effect is guaranteed by both the nitrification pool and the aerobic pool. Different, the nitrification effect must be different. When the solid-liquid separation tank sludge exceeds a relatively large, the main body of the nitrification system at this time is the aerobic tank using the activated sludge method, and the low nitrification load leads to the aerobic tank design tank Finally, this process relies on chemical phosphorus removal, denitrification phosphorus removal and biological phosphorus removal to complete together. When the sludge exceeds a relatively high level, the actual process flow of most of the sewage in the system will be anaerobic-anoxic- Aerobic (AAO), the carbon source utilization rate of the system raw water will be greatly reduced at this time, which will affect the nitrogen and phosphorus removal effect

[0007] In the actual application process, first, the traditional AOA process adopts the activated sludge method, which cannot guarantee the nitrification effect under the impact of influent water; second, adding fillers in the aerobic zone still cannot avoid the aerobic decomposition of the internal carbon source. Therefore, the endogenous denitrification effect in the anoxic zone cannot be guaranteed; thirdly, the separation of mud and water after the anaerobic zone can avoid the aerobic decomposition of the internal carbon source, but the design requirements for the process flow are higher and need to be more rigorous. More cautious; Fourth, the traditional AOA process still relies on traditional nitrification and denitrification to achieve nitrogen removal. On the basis of the extreme lack of carbon sources in the influent, there is still a risk of TN exceeding the standard in the effluent. However, the AOA coupled anaerobic ammonium oxidation process There is also the problem that the effect of anaerobic ammonia oxidation treatment is not obvious due to the symbiosis of mud film

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