Biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage

Abstract

The invention relates to a biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage. Sewage passes through a grating and a primary settling tank at first so that partial suspended solids are removed, next, the sewage passes through an anaerobic filter tank loaded with iron carbon filler and an aerobic filter tank, the effluent of the aerobic filter tank flows back to the anaerobic filter tank, organic matters in the sewage in the anaerobic state are acidified so that the pH is reduced, an electrochemical reaction is aroused on the surface layer of the iron carbon filler to intensify denitrification, and in the meantime, few ferrous ions (Fe<2+>) are dissolved out; the ferrous ions (Fe<2+>) are oxidized into ferric ions (Fe<3+>) in the aerobic state, the ferric ions react with soluble phosphate radicals in the sewage to generate precipitate, and finally, the sewage enters a sedimentation basin and is gravitationally settled, and then emitted. The biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage, provided by the invention, has the advantages that no reagent needs to be fed independently to remove phosphorus, and only by virtue of the biochemical method, the COD (Chemical Oxygen Demand) in the yielding water is lower than 30 mg / L, TN (Total Nitrogen) in the yielding water is 1.5 mg / L and TP (Total Phosphorus) in the yielding water is 0.2 mg / L, and consequently, the yielding water is up to the class IV water standards of surface water. Furthermore, the biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage is simple in process, and capable of saving investment and operation costs, and thus has a great application value.

Description

Technical field [0001] A biochemical simultaneous denitrification and dephosphorization method of domestic sewage relates to a treatment method of domestic sewage. It belongs to the technical field of nitrogen and phosphorus removal in sewage treatment. Background technique [0002] Since the Taihu cyanobacteria incident broke out, eutrophication has caused the deterioration of lake water quality and threatened drinking water safety, which has attracted the attention of governments at all levels and environmental protection departments. The main culprits of eutrophication are nitrogen and phosphorus. With the implementation and promotion of the "Class A" standard in the Pollutant Discharge Standard for Urban Wastewater Treatment Plants (GB18918-2002), nitrogen and phosphorus removal has gradually become the core competitive technology in the field of sewage treatment. . [0003] Nitrogen and phosphorus removal technologies mainly include biochemical methods, physical-chemical met...

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Problems solved by technology

[0007] However, ordinary biofilters still have the problem of filter clogging and pollution caused by shedding biofilm. Usually, the requirements for influent SS are relatively high, and the effluent nitrogen and phosphorus cannot meet the standards at the same time (phosphorus is basically not removed)

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