Technology for removing nitrate nitrogen and phosphorus from water and synchronously recovering nutrient salts

A technology for nitrate nitrogen and nutrient salts, applied in the direction of phosphorus compounds, water pollutants, water/sewage treatment, etc., can solve the problems of increased cost and operational difficulty, and achieve good oxidation removal ability, convenient operation, and good removal effect Effect

Inactive Publication Date: 2019-07-02
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another denitrification method is to use a catalyst to convert nitrate nitrogen into nitrogen. This reaction often requires the introduction of hydrogen, which increases the cost and difficulty of operation.

Method used

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  • Technology for removing nitrate nitrogen and phosphorus from water and synchronously recovering nutrient salts
  • Technology for removing nitrate nitrogen and phosphorus from water and synchronously recovering nutrient salts
  • Technology for removing nitrate nitrogen and phosphorus from water and synchronously recovering nutrient salts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like figure 1 As shown, the present invention relates to a two-stage series-connected packed percolation bed system, including a water inlet tank, a nitrate nitrogen conversion bed, a nitrogen and phosphorus adsorption enrichment bed, a water outlet tank, a regeneration and nutrient salt recovery system, and a water distribution system to guide water into the percolation bed .

[0027] The water distribution system includes an inlet pool 1, metering pumps 2 and 7, an outlet pool 4, and interconnected water pipes.

[0028] The nitrate-nitrogen conversion bed 5, which is mainly used for nitrate conversion and organic matter removal, is arranged from bottom to top in order of 8 cm pebble support layer 8, iron-carbon micro-electrolysis layer 9 with a height of 45 cm, and the upper layer is a gravel layer 10 with a thickness of 7 cm. .

[0029] The preparation method of the filler filled with the iron-carbon micro-electrolytic layer 9 is as follows:

[0030] Weigh the raw...

Embodiment 2

[0037] The difference between embodiment 2 and embodiment 1 is that the packing arrangement in the nitrate-nitrogen conversion bed is arranged successively from bottom to top as a 5cm pebble supporting layer 8, an iron-carbon micro-electrolysis layer 9 with a height of 50cm, and the upper layer is gravel with a thickness of 5cm Layer 10.

[0038] The preparation method of the filler filled with the iron-carbon micro-electrolytic layer 7 is as follows:

[0039] Weigh the raw materials according to the mass ratio, zero-valent iron powder: activated carbon powder: kaolin: copper powder: ammonium bicarbonate is 35:17:18:3:8 (can be weighed in g or kg), after mixing the raw materials evenly, add An appropriate amount of deionized water was stirred until suitable for granulation, and prepared into granules with a particle diameter of 15 mm. Dry the prepared granules in a vacuum drying oven at 105°C for 2 hours, then put the material into a vacuum tube furnace with nitrogen as a pro...

Embodiment 3

[0044] The difference between embodiment 3 and embodiment 1 is that the arrangement of fillers in the nitrate-nitrogen conversion bed from bottom to top is followed by a 10cm pebble supporting layer 8, an iron-carbon micro-electrolysis layer 9 with a height of 40cm, and an upper layer of gravel with a thickness of 10cm. Layer 10.

[0045] The preparation method of the filler filled with the iron-carbon micro-electrolytic layer 7 is as follows:

[0046] Weigh raw materials according to mass ratio, zero-valent iron powder: activated carbon powder: kaolin: copper powder: ammonium bicarbonate is 45:15:15:0.5:12 (can be weighed in g or kg), after mixing the raw materials evenly, add An appropriate amount of deionized water was stirred until suitable for granulation, and prepared into granules with a particle diameter of 20 mm. Dry the prepared granules in a vacuum drying oven at 105°C for 2 hours, then put the material into a vacuum tube furnace with nitrogen as a protective gas, ...

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Abstract

The invention discloses a technology for removing nitrate nitrogen and phosphorus from water and synchronously recovering nutrient salts. A device for implementing the technology sequentially comprises an influent water tank, a nitrate nitrogen conversion bed, a nitrogen-phosphorus adsorption enriching bed, an effluent water tank, and a regeneration and a nutrient salt recovery system. The nitratenitrogen conversion bed is filled with a self-made iron-carbon micro-electrolysis filler to convert nitrate nitrogen into ammonia nitrogen and a small part of nitrogen; the nitrogen-phosphorus adsorption enriching bed is filled with a nitrogen-phosphorus adsorption material; and the regeneration and nutrient salt recovery system can regenerate the adsorption saturated nitrogen-phosphorus filler and recycle magnesium ammonium phosphate (streptite) obtained by reacting eluted nitrogen and phosphorus with the a magnesium salt. The technology has the advantages of simplicity in nitrogen and phosphorus removal, and environmental protection, is a sustainable and green nitrogen-phosphorus recovery method integrating pollutant removal and resource recovery, is suitable for removing different forms of nitrogen, including ammonia nitrogen and nitrate nitrogen, in water, and is especially suitable for recovering nutrient elements in sewage water with a low carbon/nitrogen and purifying the water.

Description

technical field [0001] The invention belongs to the technical field of water pollution control and treatment, and in particular relates to a process for removing nitrate nitrogen and phosphorus in water and synchronously recovering nutrient salts. Background technique [0002] Nitrates are common pollutants in polluted water bodies. Biological denitrification is currently a widely used denitrification technology, but this technology is limited by the dissolved oxygen environment of water bodies and the content of available biological carbon. Theoretically, when the COD / N ratio in water is greater than or equal to 2.86, microbial heterotrophic denitrification will be more thorough, otherwise an additional carbon source is required. Another denitrification method is to use a catalyst to convert nitrate nitrogen into nitrogen gas. This reaction often requires the introduction of hydrogen gas, which increases the cost and operation difficulty. The conversion of nitrate nitroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C01B25/45C02F101/10C02F101/16
CPCC01B25/451C02F1/281C02F1/46104C02F2101/105C02F2101/163C02F2303/16
Inventor 全向春陈亮白文荣李京辉
Owner BEIJING NORMAL UNIVERSITY
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