Denitrification method combining denitrification agent and ultraviolet light

An ultraviolet light and denitrification technology, applied in the field of water treatment, can solve the problems of low denitrification efficiency, complicated operation and high cost, and achieve the effect of simple operation, fast start-up and low cost

Inactive Publication Date: 2014-05-14
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Aiming at the technical problems of low denitrification efficiency, complex operation, high cost and easy production of toxic intermediate products in the existing water denitrification technology, the present invention provides a denitrification method combining denitrification agent and ultraviolet light

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  • Denitrification method combining denitrification agent and ultraviolet light
  • Denitrification method combining denitrification agent and ultraviolet light
  • Denitrification method combining denitrification agent and ultraviolet light

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Embodiment 1

[0033] In conjunction with the accompanying drawings, a denitrification method in this embodiment in which a denitrification agent is used in combination with ultraviolet light can treat nitrogen pollutants such as nitrate, nitrite, ammonia nitrogen, nitro-substituted organic matter, nitroso-substituted Compounds and azo compounds have no restrictions on the acidity and alkalinity of the water to be treated, and have a wide range of applications. They can be used for the denitrification of various water bodies such as drinking water, sewage, industrial wastewater, reclaimed water, seawater, and groundwater.

[0034]This example mainly proves that this denitrification method removes nitrogen pollutants represented by nitrate in water. The initial concentration of nitrate in the water to be treated is 6.4mg / L, the pH of the aqueous solution is 9.2, the water temperature is 25°C, and the turbidity is less than 30NTU , The absorbance of 254nm wavelength light is less than 10cm-1. ...

Embodiment 2

[0038] A denitrification method in which a denitrification agent and ultraviolet light are combined in this embodiment is basically the same as in Example 1, except that the treatment object of this embodiment is nitrite nitrogen, and the denitrification agent used is made of sodium sulfite (or sodium bisulfite) and sodium hydroxide compounded, of which, sodium sulfite or sodium bisulfite 95%, sodium hydroxide 5%. The formula is simple and cost-effective, and can also achieve efficient and directional conversion of active species in the system to achieve efficient nitrogen removal. The concentration of the denitrification agent is added according to the molar equivalent ratio of the sulfur contained in the denitrification agent and the nitrogen contained in the nitrogen pollutant in the water to be treated is 20:1. The denitrification agent is first dissolved in the dissolution pool and then passed through the metering pump Add it into the water to be treated, mix well and ent...

Embodiment 3

[0040] A denitrification method in this embodiment using a denitrification agent in combination with ultraviolet light is basically the same as in Embodiment 1, except that the treatment object in this embodiment is ammonia nitrogen. The denitrification agent used is composed of 90% sodium metabisulfite and 10% sodium thiosulfate. The concentration of the denitrification agent is added according to the molar equivalent ratio of the sulfur contained in the denitrification agent and the nitrogen content of the nitrogen pollutant in the water to be treated is 100:1. The denitrification agent is first dissolved in the dissolution pool and then passed through the metering pump Add it directly into the photoreactor, and achieve uniform mixing with the water to be treated by improving the water conservancy conditions inside the photoreactor, and at the same time realize denitrification treatment. The ultraviolet light adopts the overcurrent irradiation method, the light source adopts...

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Abstract

The invention discloses a denitrification method combining a denitrification agent and ultraviolet light and belongs to the technical field of water treatment. The denitrification method comprises the following steps: adding the denitrification agent into water for treating, after uniformly mixing, irradiating by using the ultraviolet light; or leading the water for treating into an ultraviolet light reactor, directly adding the denitrification agent into the ultraviolet light reactor to finish the denitrification treatment, wherein the wavelength of the ultraviolet light is less than 400 nanometers; the used denitrification agent is composed of one or more of sulfite, hydrosulphite, sulfur dioxide, pyrosulfite, hydro-metabisulfite, thiosulfate, sulfide, sodium bisulfide, ferrous ion and iron ion; the denitrification agent is added according to the Mole equivalence ratio of sulfur contained in the denitrification agent to nitrogen contained in nitrogen pollutants in the water for treating of being (0.1-100):1. By using the denitrification method, the purpose of efficiently and harmlessly removing nitrate, nitrite, ammonia nitrogen, nitro substituted organic matters, nitroso substituted organic matters and azo compounds in the water is achieved.

Description

technical field [0001] The invention relates to the technical field of water treatment, more specifically, to a denitrification agent combined with ultraviolet light to remove nitrate nitrogen, nitrite nitrogen, ammonia nitrogen, nitro-substituted organic matter, nitroso-substituted compounds and azo method of compounds. Background technique [0002] With the rapid development of industry and agriculture, a large amount of nitrate nitrogen enters the environment through industrial wastewater, agricultural fertilizers and municipal sewage, causing serious pollution of soil, surface water, seawater and groundwater. Nitrogen-containing pollutants have strong toxicity, which can not only cause blue baby syndrome, but also transform into highly toxic nitrite and nitrosamines through microbial metabolism and chemical reduction, which can lead to diabetes, reproductive toxicity and cancer The occurrence of nitrogen pollution; and nitrogen pollution is also significantly related to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/72C02F1/70C02F1/58
Inventor 潘丙才李旭春滕龙
Owner NANJING UNIV
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