Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF5 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Denitrification method combining denitrification agent and ultraviolet light
  • Denitrification method combining denitrification agent and ultraviolet light
  • Denitrification method combining denitrification agent and ultraviolet light

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
wavelengthaaaaaaaaaa
absorbanceaaaaaaaaaa
absorbanceaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com