Combined biological filter for removing nitrogen and phosphorus

Abstract

The invention discloses a combined biological filter for removing nitrogen and phosphorus. A lower supporting plate and an upper supporting plate are respectively arranged at the lower part and the upper part of an anaerobic tank; the lower supporting plate, the upper supporting plate and the side wall of the anaerobic tank form an anaerobic chamber; a plurality of anaerobic biological filler is arranged in the anaerobic chamber; the anaerobic biological filler consists of an anaerobic carrier and an anaerobic microbial membrane hanging to and covering the surface of the anaerobic carrier; an aerobic tank is vertically provided with an aeration tube embedded into the center of a lower sieve plate and the center of an upper sieve plate; the carrier is prepared from the following components in parts by weight: high density polyethylene, slaked lime, Dow powder activated carbon, light calcium carbonate, maleic anhydride, dicumyl peroxide, gelatin, chitin, ferroferric oxide magnetic powder and manganese zinc ferrite. The combined biological filter disclosed by the invention can keep relatively-high BOD5 / TN ratio, and ensures smooth operation of denitrification nitrogen removal; the removal rate of TN reaches 80.6 percent.

Description

technical field [0001] The invention relates to a composite biological filter for nitrogen and phosphorus removal, belonging 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 source. [0003] The existi...

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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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