Aerobic nitrification-anoxic denitrification biological filter tank denitrification system

Abstract

The invention discloses an aerobic nitrification-anoxic denitrification biological filter tank denitrification system. The aerobic nitrification-anoxic denitrification biological filter tank denitrification system comprises an anaerobic tank and an aerobic tank, wherein a lower support plate, an upper support plate and the side wall of the anaerobic tank form an anaerobic cavity; a plurality of anaerobic biological filler is arranged in the anaerobic cavity and are composed of anaerobic carriers and anaerobic microbial membranes hung on the surfaces of the anaerobic carriers; a lower sieve plate and an upper sieve plate are respectively mounted at the lower part and the upper part of the aerobic tank; the lower sieve plate, the upper sieve plate and the side wall of the aerobic tank form an aerobic cavity; a plurality of aerobic biological filler is arranged in the aerobic cavity; carriers are prepared from the following components in parts by weight: high-density polyethylene, slaked lime, Dow powdered activated carbon, light calcium carbonate, maleic anhydride, diisopropylbenzene peroxide, gelatin, chitin, ferroferric oxide magnetic powder and manganese zinc ferrite. The aerobic nitrification-anoxic denitrification biological filter tank denitrification system is capable of ensuring high ratio of BOD5/TN of the anaerobic filter tank; the removal effect of total nitrogen is totally improved; and the backflow of nitrification liquid is reduced.

Description

technical field [0001] The invention relates to an aerobic nitrification-anoxic denitrification biological filter denitrification system, which belongs to the technical field of sewage treatment. Background technique [0002] At present, the traditional nitrification-denitrification biological denitrification (A / O) process is mostly used in China for denitrification treatment. Generally, it is removed through three processes of ammonification, nitrification and denitrification. Among them, ammonification is carried out by microorganisms. It is the process of synthesizing macromolecular organic matter into ammonia nitrogen. Nitrification is the process in which nitrifying bacteria oxidize ammonia nitrogen into nitrate under aerobic conditions. This process provides a substrate for denitrification; denitrification is the use of nitrate by microorganisms as electrons. Acceptor, the process of reducing nitrate to gaseous nitrogen removal system using organic matter as a carbon s...

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Problems solved by technology

[0004] (1) The denitrification process needs to consume organic carbon sources, but at present, the concentration of organic carbon in many wastewaters is low, which cannot meet the requirements of denitrification, and the addition of carbon sources increases the project investment;

[0005] (2) The traditional denitrification process generally requires nitrifying liquid and sludge backflow, so the required hydraulic retention time is longer, resulting in higher infrastructure investment and operating costs;

[0006] (3) The nitrification process and denitrification process in the traditional denitrification process are opposed to each other. The nitrification process is completed by autotrophic aerobic bacteria, while the denitrification is completed by heteroxic anaerobic bacteria. The two processes are opposite and the microbial population generation cycle The difference is very large, and the whole process becomes complicated

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