Processing device for deep nitrogen and carbon removal of waste water and technology thereof

Abstract

The invention discloses a processing device for deep nitrogen and carbon removal of waste water and a technology thereof. The device is formed by successively connecting an anoxic denitrification biofilter, an ozone oxidation pond, an aerobiotic carbon removal biofilter and a clean water tank in series, a nitration liquid refluxing system is arranged between a water inlet of the anoxic denitrification nitrogen removal biofilter and the clean water tank. A denitrification nitrogen removal and alkali production process of the waste water is completed by an additional carbon source through the anoxic denitrification biofilter; then the waste water is enabled to flow into the ozone oxidation pond to remove part of organic matters; the waste water is enabled to flow into the aerobiotic carbon removal nitration biofilter to realize the purpose of removing the organic matters and ammonia nitrogen through fully using DO (Dissolved Oxygen) in effluent by microorganisms; finally the waste water is enabled to enter into the clean water tank, part of the waste water refluxes to the anoxic denitrification biofilter serving as refluxing nitration liquid, and part of the waste water is discharged with standard level. The processing device for the deep nitrogen and carbon removal of the waste water and the technology thereof fully use the denitrification and alkali production process, so that the influence of the DO to the denitrification nitrogen removal is avoided; the ozone tail gas and the DO in the effluent are fully used, so that the energy consumption is greatly reduced and the advantage is obvious.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a waste water deep denitrification and carbon removal treatment device and a process thereof, which are suitable for deep treatment of industrial waste water. Background technique [0002] At present, although ammonia nitrogen and most organic matter can be effectively removed after secondary biochemical treatment, the refractory nitrogen-containing organic wastewater including coking, chemical industry, petrochemical, printing and dyeing, papermaking, medicine, pesticide, landfill leachate, etc. Containing a certain concentration of refractory organic matter, nitrate nitrogen, organic nitrogen and ammonia nitrogen, the secondary biochemical effluent has extremely poor biodegradability, and requires advanced treatment to meet the discharge and reuse requirements. At present, there are many technologies for the advanced treatment of wastewater, among which the ...

AI Technical Summary

Problems solved by technology

The dissolved oxygen in the effluent of the ozone oxidation tank can usually be as high as 20-30 mg / L, resulting in too high dissolved oxygen in the influent water of the anoxic denitrification biological filter

This process has the following defects: ① denitrifying bacteria are heterotrophic anaerobic bacteria, which need to grow and reproduce under anoxic / anaerobic conditions, and high concentrations of dissolved oxygen will seriously inhibit denitrification (in biofilm systems, dissolved oxygen controlled below 1.0mg / L), which seriously limits the denitrification capacity of the system; ② needs to provide 0.733kgO to remove 1kgBOD 2 , when the dissolved oxygen in the anoxic denitrification biological filter is too high, the aerobic microorganisms in the anoxic denitrification biological filter will become the dominant bacterial species, not only the effective denitrification filter will be greatly reduced, but also a large amount of additional waste will be wasted. Denitrification carbon source; ③ Due to the extremely low biodegradability of the secondary biochemical effluent, it is necessary to add a large amount of denitrification carbon source. The engineering practice results show that due to the problem of partial water distribution between the filter layers, the addition of denitrification carbon source The effluent COD of the denitrification biological filter will undoubtedly be about 5-10mg / L higher than the influent COD

This process has the following defects: the cost of ozone treatment is higher than the cost of biological treatment of aerobic biofilter, ozone can better improve the biodegradability of wastewater, and there are a large number of easily degradable small molecule organics in the effluent; if only ozone is used to ensure the effluent COD reaches the standard, but the easily degradable small molecule organic matter is not fully degraded. On the one hand, it is difficult to ensure the stable discharge of the effluent by ozone alone. On the other hand, it does not meet the economic requirements of wastewater treatment.

[0005] (3) The dissolved oxygen in the effluent of the ozone oxidation tank is very high, and the dissolved oxygen in the effluent has not been fully utilized; the ozone reaction tank in the combined ozone oxidation process is generally equipped with an ozone tail gas destruction device, and the tail gas has not been rationally utilized, which will undoubtedly increase processing cost

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