Post-denitrification nitrogen removal filter device based on deep upgrading and treatment process of post-denitrification nitrogen removal filter device

Abstract

The invention discloses a post-denitrification nitrogen removal filter device based on deep upgrading and a treatment process of the post-denitrification nitrogen removal filter device. The device isformed by sequentially connecting an inner water inlet pore plate grid, an aerobic nitrification biological filter, a denitrification deep-bed V-shaped filter and a clean water tank in series. By adopting the device, the problem that a filter head of a traditional aerobic nitrification biological filter is easy to block due to fibrous impurities is solved; the problems that a traditional upward flow denitrification filter tank has large operation pressure, a ceramsite filter material layer is prone to hardening, and SS of an effluent of the denitrification filter tank is difficult to be lowerthan 5 mg / L are solved. A denitrification constant water level technology is utilized, so that the problem of drop water level oxygenation of a denitrification deep bed V-shaped filter tank is solved,and a carbon source is greatly saved; the standard of the first-grade effluent A or the first-grade effluent B can be improved, it is guaranteed that the economical efficiency of the effluent stablyreaches the IV-class water standard of Environmental Quality Standards for Surface Water (GB3838-2002), and great application and popularization value is achieved for upgrading of low-carbon-nitrogen-ratio sewage.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a post-position denitrification and denitrification filter device and a treatment process thereof based on depth raising. Background technique [0002] At present, as my country's water pollution problems become increasingly prominent, the improvement of urban sewage treatment and discharge standards has become the general trend. Judging from the current requirements for improving the quality of the water environment, the effluent treated by many urban sewage treatment plants is often discharged into urban rivers and becomes the water body of the river. For the effluent of existing sewage treatment plants in my country, the discharge standards refer to Class I B or Class A in the "GB18918-2002 Pollutant Discharge Standards for Urban Sewage Treatment Plants". However, for the first-class B or first-class A standard, its water quality is only equivalent...

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Problems solved by technology

[0003] At present, practice has been carried out in various parts of the country, and the requirements for CODCr, ammonia nitrogen, total nitrogen, and total phosphorus in the effluent of sewage plants are higher. The following problems: (1) The fibrous material in the front section of the traditional upward flow biofilter or the residual PAC or PAM from the pretreatment process will adhere to the surface of the filter gap of the biological filter head, and the biofilm attached thereto will block the filter gap, And the forced backwashing of the filter is also difficult to wash and remove, which will cause the filter head to block, and finally cause the filter to be in a state of paralysis; (2) the traditional upflow biological aerated filter (including aerobic biological filter, denitrification biological filter ) The SS of the effluent is generally 10-20mg / L, and the SS of the effluent is difficult to reach below 5mg / L; (3) The surface load of the traditional chemical phosphorus removal sedimentation tank is too low, and the floor area is large; (4) The traditional post-installation is good Oxynitrification biological filter - anoxic denitrification biological filter group, the effluent SS cannot meet the standard

At present, practice has been carried out in various parts of the country, and the requirements for CODCr, ammonia nitrogen, total nitrogen, and total phosphorus in the effluent of sewage plants are higher, and the existing Class IV water technology is actually difficult to meet the requirements of Class IV water effluent indicators.

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