Check patentability & draft patents in minutes with Patsnap Eureka AI!

Ion-exchange defluorination method for fluorine-containing wastewater through efficient complexing

A technology for ion exchange and wastewater, applied in ion exchange water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve the problem of difficult one-time removal of fluorine-aluminum complexes, and achieve improved resin adsorption efficiency and removal Effects of reduced fluorine cost and low solid waste output

Active Publication Date: 2020-03-17
NANJING UNIV +1
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that various fluorine-aluminum complexes formed in the existing complexation defluorination method are difficult to remove at one time, the present invention provides an ion exchange defluorination method for efficient complexation of fluorine-containing wastewater, by converting fluoride ions in wastewater into Anionic fluorine-aluminum complexes with greater exchange potential for efficient fluoride removal in fluorine-containing wastewater

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
  • Ion-exchange defluorination method for fluorine-containing wastewater through efficient complexing
  • Ion-exchange defluorination method for fluorine-containing wastewater through efficient complexing
  • Ion-exchange defluorination method for fluorine-containing wastewater through efficient complexing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0037] Take 1L of fluorine-containing wastewater from the electroplating industry, the pH value of the wastewater is 8.2, the initial fluorine concentration is 89mg / L, that is, the molar amount of fluorine is 0.0047mol / L, and the initial aluminum concentration in the wastewater is 0.0023mg / L. Use hydrochloric acid to adjust the pH value of the wastewater to 3, add aluminum chloride to the solution of Al 3+ The molar ratio of fluorine to the solution is 1:6, the amount of fluorosilicic acid added is 0.1mg / L, and the mixture is fully stirred. The stirred solution enters the resin adsorption column for adsorption, and the content of aluminum and fluorine in the adsorbed water is monitored. The resin material is anion exchange resin 201, the resin filling volume is 20mL, the adsorption rate is controlled at 1BV / h, and desorption is performed after the adsorption is completed. The desorption solution is 4% sodium hydroxide solution, and the desorption rate is controlled at 1BV / h. ...

Embodiment 1B

[0039] Adopt the waste water identical with embodiment 1A, treatment condition and step are with embodiment 1A, difference only is: add aluminum chloride to the Al in the solution 3+ The molar ratio to fluorine in the solution is 1:5, and the content of aluminum and fluorine in the adsorbed water is monitored.

Embodiment 1C

[0041] Adopt the waste water identical with embodiment 1A, treatment condition and step are with embodiment 1A, difference only is: add aluminum chloride to the Al in the solution 3+ The molar ratio to fluorine in the solution is 1:4, and the content of aluminum and fluorine in the adsorbed water is monitored.

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

No PUM Login to View More

Abstract

The invention discloses an ion-exchange defluorination method for fluorine-containing wastewater through efficient complexing, and belongs to the field of wastewater treatment. The method includes S1)adjusting the pH value of the fluorine-containing wastewater to 3-6; S2) adding an aluminum salt and fluorosilicic acid to the wastewater treated in the step S1, and reacting under stirring; S3) subjecting the solution obtained after treatment in the step S2 to adsorption by anion exchange resin to obtain adsorption discharge water. By the scheme, the resin adsorption efficiency is significantlyimproved, and the interference of other ions in the presence of other competing ions can be effectively reduced; the method is performed under acidic conditions, and does not generate solid waste during the defluorination process, thus facilitating further promotion and application in treatment of fluorine-containing wastewater.

Description

technical field [0001] The invention belongs to wastewater treatment, and more specifically relates to a method for removing fluoride from fluorine-containing wastewater. Background technique [0002] Fluorine is the halogen with the smallest atomic weight, and it is located in group VIIA of the second period of the periodic table of elements. A certain amount of fluorine and its organic compounds have the effect of preventing dental caries, but if the content exceeds or falls below the allowable range, it will cause great harm to the human body. Excessive fluorine content will affect the metabolism of calcium and phosphorus in the human body, and make the material metabolism and physiological functions of the human body disordered, resulting in a series of poisoning symptoms such as skeletal fluorosis and dental plaque. Researchers have made a more in-depth investigation on this, and determined that the appropriate concentration of fluorine in drinking water is 0.5-1.0 mg / ...

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): C02F9/04C02F101/14
CPCC02F1/583C02F1/42C02F9/00C02F2101/14C02F2001/422C02F1/66C02F2301/08
Inventor 张炜铭高亚娟朱兆坚汪林张孝林张延扬吕振华
Owner NANJING UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com