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Biomimetic denitrification method for wastewater containing low-concentration ammonia nitrogen

A low-concentration ammonia nitrogen and denitrification technology, applied in the field of bionic denitrification, can solve the problems of reduced biological survival, low efficiency, and long time for wastewater treatment, achieving less waste residue generation, simple equipment, avoiding pollution transfer and secondary pollution effect

Inactive Publication Date: 2019-05-03
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biological denitrification method has the disadvantage of taking a long time to treat wastewater.
Moreover, since nitrogen (N) is an essential nutrient element for organisms, when its content in the water body is low, the number of living organisms is greatly reduced, resulting in low efficiency of biological methods in the application of deep denitrification treatment of water bodies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 0.05 g of ferrous sulfate heptahydrate and 0.03 g of tartaric acid to 100 mL of ammonium chloride aqueous solution with a nitrogen content of about 25 mg / L, and adjust the pH to 7.5-8 with sodium hydroxide. Then put this solution in light intensity of about 10*10 3 Exposure to sunlight in μW / cm2. After 5 hours, the residual nitrogen concentration in the solution was measured to be 6.8 mg / L.

[0026] At the same time, a comparative experiment was carried out under the same conditions except that there was no light, and the residual nitrogen content of the solution was about 22 mg / L after 5 hours.

Embodiment 2

[0028] In 100 mL of ammonium sulfate aqueous solution with a nitrogen content of about 25 mg / L, add 0.001 g of ferric sulfate and 0.0035 g of citric acid monohydrate, and adjust the pH to 8-8.5 with sodium hydroxide. Then put this solution in light intensity of about 30*10 3 μW / cm 2 exposure to sunlight. After 5 hours, the residual nitrogen concentration in the solution was measured to be 16 mg / L.

[0029] At the same time, a comparative experiment was carried out under the same conditions except that there was no light, and the residual nitrogen content of the solution was about 23 mg / L after 5 hours.

Embodiment 3

[0031] In 100 mL of ammonium carbonate aqueous solution with a nitrogen content of about 15 mg / L, add 0.02 g of ferric chloride and 0.05 g of dipotassium hydrogen phosphate, and adjust the pH to 8.5-9.0 with potassium hydroxide. Then put this solution in light intensity of about 25*10 3 μW / cm 2 exposure to sunlight. After 5 hours, the residual nitrogen concentration in the solution was measured to be about 2.0 mg / L.

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Abstract

The invention discloses a biomimetic denitrification method for wastewater containing low-concentration ammonia nitrogen. The inventors are inspired by a self-purifying function of a water body, and the method realizes denitrification of the water body under the conditions similar to a natural water environment under illumination. The method comprises the following steps: adding a transition metal-containing compound and an auxiliary agent into a water body containing the low-concentration ammonia nitrogen, and performing denitrification operation under irradiation of natural light or simulated sunlight. The method provided by the invention has the characteristics of reducing the nitrogen content in the ammonia nitrogen-containing wastewater by controlling an adding amount of a transitionmetal-containing compound and the auxiliary agent and controlling the pH of the solution; the method is used for ''bionic'' deamination denitrification under natural conditions similar to a water body, and compared with a ''pure'' biological denitrification method, the method provided by the invention has the characteristics of retaining environmental compatibility advantages of biological denitrification and accelerating time required for water treatment; and the reagents used in the method are economic and easy to obtain, species contained in the method are species commonly existing in a natural water body, no harmful elements are added into the system during denitrification, and the method is an environmentally-friendly treatment process.

Description

【Technical field】 [0001] The invention relates to the field of waste water treatment of environmental technology, in particular to a method for biomimetic denitrification of waste water containing low-concentration ammonia nitrogen. 【Background technique】 [0002] Water is the source of life. Water resources are also an indispensable natural resource for human production and life, and one of the important elements of the ecological environment. [0003] The water body itself has the function of self-purification. However, when the pollutants in the water body exceed its self-purification capacity, serious water pollution will occur. This harmful effect will also pose a serious threat to human health and become a "bottleneck" restricting the sustainable development of economy and society. [0004] Among all kinds of water pollutants, excessive nitrogen concentration accounts for a large proportion. Nitrogen in water mainly comes from the metabolism and corruption of organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F101/16
Inventor 孙波李学领吴新世王皓天张春雪万钧
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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