Biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage

A technology for simultaneous denitrification and phosphorus removal, and domestic sewage treatment. It is applied in the field of domestic sewage treatment. It can solve the problems of high SS requirements for influent water, inability to meet the phosphorus standards at the same time, and filter blockage. It achieves a small footprint and reduces sludge. volume, the effect of maintaining stability

Inactive Publication Date: 2014-01-08
TONGJI UNIV
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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...

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  • Biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage

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Embodiment 1

[0025] The preparation method of iron-carbon filler is in accordance with the patent number ZL200910198816.9, and the name of the invention is iron-carbon micro-electrolysis filler. Preparation method: first use powdered activated carbon with a particle size of less than 60 mesh and a particle size of less than 100 mesh as the raw material, and measure the iron: carbon = (10~1): 1 mass ratio, the mixed raw materials are added into the model by a powder press under a pressure of 200kN to form a spherical blank with a spherical diameter of 8~3mm, and then heated at 1050~1200℃ for 90~100min in isolation Quenched.

[0026] Then, the iron-carbon fillers prepared above are respectively loaded into the anaerobic filter tank and the aerobic filter tank.

[0027] The filling volume of iron-carbon filler in the anaerobic filter is 70% by volume of the internal volume of the anaerobic filter.

[0028] The filling volume of the iron-carbon filler in the aerobic filter is 70% of the internal vol...

Embodiment 2

[0030] Taken from a sewage treatment plant in a city: COD is 126mg / L, TN is 28mg / L, TP is 3.2mg / L, and pH is 6.7. First, use the grille and the primary sedimentation tank to pre-remove part of the suspended solids and then enter the collection well. The primary sedimentation tank is a flat flow sedimentation tank with a surface load of 1m. 3 / m 2 .h, the residence time is 3h, and then stay in the collection well for 0.5h to ensure the normal operation of the pump and reduce the disturbance of the advection sedimentation tank. Then the domestic sewage in the collection well enters the anaerobic filter and the aerobic filter in turn. The effluent from the aerobic filter is returned to the anaerobic filter with a return ratio of 50%. The anaerobic filter adopts microporous aeration head aeration. The gas-water ratio is 10:1, the residence time in the anaerobic filter tank is 1.5h, and the residence time in the aerobic filter tank is 3h. The effluent is discharged after gravity sedi...

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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...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 潘碌亭韩悦
Owner TONGJI UNIV
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