Nitrogen and phosphorus removal device for deep upgrading and treatment process thereof

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 treatment method, 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 traditionalupward flow denitrification filter tank is large in operation pressure, a ceramsite filter material layer is prone to hardening, and SS of effluent of the denitrification filter tank is difficult tobe lower than 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, so that it is guaranteed that the effluent economically and stably reaches 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 specifically relates to a highly improved denitrification and phosphorus removal device and its treatment process. Background technique [0002] At present, as the water pollution problem in my country has become increasingly prominent, the improvement of urban sewage treatment and discharge standards has become a general trend. Judging from the current requirements for improving the quality of the water environment, the effluent from many urban sewage treatment plants is often discharged into urban rivers and becomes the water body of the river. For the effluent from existing sewage treatment plants in my country, the discharge standards mostly refer to Level 1 B or Level A in the "GB18918-2002 Pollutant Discharge Standard for Urban Sewage Treatment Plants". However, for Grade B or Grade A standards, the water quality is only equivalent to surface water inferior to Grade V water....

AI Technical Summary

Problems solved by technology

[0003] At present, practice has been carried out in various parts of the country, and the requirements for total nitrogen and total phosphorus in the effluent of sewage plants are higher. It is actually difficult for the existing Class IV water technology to meet all the indicators; the existing treatment devices and treatment processes mainly have the following problems: ( 1) Traditionally, the fibrous material in the front section of the forward flow biofilter or the residual PAC or PAM from the pretreatment process will adhere to the filter slit surface of the biofilter head, and the biofilm attached thereto will block the filter slit, and the filter is forced to It is also difficult to wash and remove by backwashing, which will cause blockage of the filter head and eventually cause the filter to be paralyzed; (2) The effluent SS of the traditional upflow biological aerated filter (including aerobic biological filter and denitrification biological filter) is ordinary 10-20mg / L, and the SS of the effluent is difficult to reach below 5mg / L; (3) The surface load of the traditional chemical dephosphorization coagulation sedimentation tank is too low, and it is easy to cause the problem of blockage of the filter head of the filter, which occupies a large area

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

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