Denitrification expanded bed and method for treating wastewater containing nitrate and nitrogen

Abstract

The invention discloses a denitrification expanded bed and a method for treating waste water containing nitrate nitrogen. The denitrification expanded bed includes: an anoxic expanded bed reactor, and the anoxic expanded bed reactor is respectively bottom water distribution area, Anoxic reaction zone and three-phase separation zone; water outlet tank and self-cleaning filter, the inside of the water outlet tank is provided with a water outlet zone and a mixing zone, and the water outlet zone is connected to the three-phase separation zone and the mixing zone, so The mixing zone is communicated with the bottom water distribution zone through the self-cleaning filter; wherein, the bottom of the anoxic expanded bed reactor is provided with a water distribution plate for separating the bottom water distribution zone and the anoxic reaction zone; the anoxic A three-phase separator is installed at the top of the expanded bed reactor. The denitrification expanded bed can effectively avoid the phenomenon of water flow short circuit.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and more specifically relates to a denitrification expanded bed and a method for treating wastewater containing nitrate and nitrogen. Background technique [0002] Denitrification is the reduction of nitrate to nitrogen through microbial anoxic biochemical reactions, and is the most commonly used biochemical process for denitrification of sewage. [0003] According to the growth form of microorganisms, the biochemical reaction can be divided into activated sludge method and biofilm method. The biofilm method retains a large amount of microorganisms and has a high processing load, but the biofilm process still has the following disadvantages: (1) Plastic fillers It is not easy to form a film; (2) Fillers of inorganic materials such as ceramsite are easy to form a film, but due to the fixed bed operation, local blockage of the packing layer often occurs, which leads to a short circuit ...

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Problems solved by technology

[0003] According to the growth form of microorganisms, biochemical reactions can be divided into activated sludge method and biofilm method. The biofilm method retains a large amount of microorganisms and has a high processing load, but the biofilm process still has the following disadvantages: (1) Plastic material fillers It is not easy to form a film; (2) Fillers of inorganic materials such as ceramsite are easy to form a film, but due to the operation of a fixed bed, local blockage of the packing layer often occurs, which leads to a short circuit of the water flow and affects the treatment effect

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