Method for recovering uranium-containing wastewater and uranium in underground water through high-efficiency electrochemical reduction enrichment

A groundwater and wastewater technology, applied in chemical instruments and methods, reduced water/sewage treatment, polluted groundwater/leachate treatment, etc., can solve the problems of secondary pollution, low treatment efficiency, difficult uranium separation, etc. Quick removal and recovery, good removal and recovery effect, easy and convenient operation

Active Publication Date: 2018-11-30
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited treatment capacity of the adsorption method, the treatment effect on high-concentration uranium-containing wastewater is not ideal, and the treatment efficiency for complexed uranium in groundwater, such as uranyl carbonate, is very low; in addition, due to the adsorption equilibrium of the adsorbent, for low The treatment efficiency of the concentrated uranium-containing wastewater system is low
The chemical precipitation method is to fix uranium from the water environment in the form of precipitation by adding flocculants and coagulants, but this method is not effective for complexed uranium, such as uranyl ca

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, certain high-concentration uranium-containing wastewater

[0035] Add 100ml of uranium-containing wastewater (U(VI) concentration is 55mg / L, pH value is 7.5) into the reaction tank, use titanium plate as cathode and anode, and remove uranium by electroreduction under the condition of DC power supply of about 2V. After 8 hours of electroreduction under normal temperature and pressure conditions, the concentration of uranium in the water body is reduced to 0.07mg / L, and the removal efficiency of uranium reaches 99.9%. After the electrode was used continuously for five times, the surface of the titanium plate was covered by a large amount of deposits, and the removal efficiency of uranium did not decrease. After putting the electrode into 100mL of 20% nitric acid solution at room temperature for 2 hours, the surface of the titanium plate electrode returned to silvery white, and the recovery rate of uranium on the electrode surface reached 99.9%.

Embodiment 2

[0036] Embodiment 2, certain high concentration, high carbonate uranium-containing wastewater

[0037] Add 100ml of high-concentration, high-carbonate uranium-containing wastewater (U(VI) concentration is 50mg / L, carbonate concentration is about 30mM, pH value is 7.5) into the reaction pool, with titanium plates as cathode and anode, at 2V Under the condition of about DC power supply, the electroreduction removes uranium. After 15 hours of electroreduction under normal temperature and pressure conditions, the concentration of uranium in the water body is reduced to 0.02mg / L, and the removal efficiency of uranium reaches 99.9%. After the electrode was used continuously for five times, the surface of the titanium plate was covered by a large amount of deposits, and the removal efficiency of uranium did not decrease. After putting the electrode into 100mL of 20% nitric acid solution at room temperature for 2 hours, the surface of the titanium plate electrode returned to silvery ...

Embodiment 3

[0038] Embodiment 3, certain low-concentration uranium-containing wastewater

[0039]First add the titanium metal electrode into a high-concentration uranium-containing solution (U(VI) concentration is 55mg / L) and perform electroreduction under normal temperature and pressure conditions for 15 hours to obtain a titanium metal plate electrode covered with a uranium dioxide coating. It acts as the cathode. Add 100ml of low-concentration uranium-containing wastewater (U(VI) concentration is 0.1mg / L, carbonate concentration is about 30mM, pH value is 7.5) into the reaction tank, and the titanium metal plate with uranium dioxide coating is used as the cathode The titanium metal plate with a clean surface is used as the anode, and the uranium is removed by electroreduction under the condition of a DC power supply of about 2.5V. After 13 hours of electroreduction under normal temperature and pressure conditions, the concentration of uranium in the water body is reduced to 0.001mg / L,...

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 a method for recovering uranium-containing wastewater and uranium in underground water through high-efficiency electrochemical reduction enrichment. Metal electrodes are used as a cathode and an anode to construct an electrochemical system, and hexavalent uranyl ions are used to reduce electrons into tetravalent insoluble uranium dioxide, so the electrodes reduce hexavalenturanium into uranium dioxide and make the uranium dioxide enriched on the surfaces of the electrodes without an exogenous additive. A tetravalent uranium coating layer can further catalytically reduce hexavalent uranium in wastewater to form a new tetravalent uranium coating layer. The uranium dioxide enriched electrodes are taken out from the solution after the electrochemical reduction enrichment in order to realize high-efficiency reducing removal of the uranium in the wastewater and underground water. The electrodes are placed in a dilute nitric acid solution, and are oxidized to furtherrealize high-efficiency recovery. The method has the advantages of wide application range, and realization of high-efficiency removal and recovery of uranyl carbonate in low-concentration and high-concentration uranium-containing wastewater and carbonate-containing underground water.

Description

technical field [0001] The invention belongs to the field of waste water treatment and relates to a method for high-efficiency electrochemical reduction, enrichment, and recovery of uranium-containing waste water and ground water. Background technique [0002] With the mining of uranium and the widespread use of nuclear energy, uranium pollution is becoming more and more serious around the world. As a heavy metal toxic and radioactive pollutant, uranium migrates in the water environment and poses a great threat to the ecological environment and human health. The uranium content in surface or groundwater in many countries has greatly exceeded the drinking water standard (30μg / L) set by the World Health Organization. For example, the uranium concentration in wastewater from some uranium mining areas is as high as 50mg / L. The key to solving uranium pollution is to develop cost-effective uranium pollution control technology. At the same time, with the increasing demand for glo...

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
IPC IPC(8): C02F1/70C02F103/06C02F101/20
CPCC02F1/70C02F2101/006C02F2101/20C02F2103/06
Inventor 栾富波刘添孟颖
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap