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Zero-valent iron type water purifying method based on electric field intensification and reactor

A zero-valent iron and reactor technology, applied in chemical instruments and methods, magnetic/electric field water/sewage treatment, water pollutants, etc., to achieve accelerated corrosion, avoid zero-valent iron passivation problems, and improve utilization

Inactive Publication Date: 2017-03-08
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems existing in the process of treating pollutants by zero-valent iron, the present invention proposes a zero-valent iron water purification method based on electric field strengthening

Method used

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  • Zero-valent iron type water purifying method based on electric field intensification and reactor
  • Zero-valent iron type water purifying method based on electric field intensification and reactor

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Experimental program
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Effect test

Embodiment 1

[0032] The outermost plate of the reactor is made of titanium mesh and activated carbon fiber; the middle plate is made of four kinds of titanium mesh, conductive glass, graphite and iron plate, arranged at intervals, and the distance between the plates is 5mm; the effective volume of the reactor is 3.0L. The nanometer zero-valent iron is placed in the reactor and mixed mechanically; the DC power supply is used for pole inversion operation every 5 minutes.

[0033] Adjust the pH value of the water to be treated to 2.8, adjust the DC power supply current to 50mA, and the current density to 0.2mA / cm 2 ; The concentration of arsenic in the water to be treated is 5 mg / L, and the concentration of arsenic in the effluent after flowing through the reactor reaches the industrial wastewater discharge standard (<0.5 mg / L).

Embodiment 2

[0035] The outermost plate of the reactor is made of diamond and graphite; the middle plate is made of five kinds of titanium mesh, activated carbon fiber, graphite, aluminum plate and iron plate, arranged at intervals, and the distance between the plates is 5mm; the effective volume of the reactor is 5.0L. Put the iron powder in the reactor, and use air to stir and mix; the DC power supply performs the electrode reversal operation every 240 minutes.

[0036] Adjust the pH value of the water to be treated to 3.2, adjust the DC power supply current to 150mA, and the current density to 5mA / cm 2 ; The concentration of lead in the water to be treated is 1mg / L, and the concentration of lead in the effluent after flowing through the reactor reaches the waste water discharge standard.

Embodiment 3

[0038]The outermost plate of the reactor is made of conductive glass or graphite; the middle plate is made of iron plate, and the distance between the plates is 20mm; the effective volume of the reactor is 100L. The iron filings are placed in the reactor, which is a fixed bed reactor, and the DC power supply is operated every 120 minutes.

[0039] The pH value of the water to be treated is adjusted to 4.5, the DC power supply current is adjusted to 600mA, and the current density is 20mA / cm2; the concentration of nitrobenzene in the water to be treated is 1 mg / L, and the concentration of nitrobenzene drops by 80% after passing through the reactor.

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Abstract

The invention relates to a method for intensifying zero-valent iron reduction to remove pollutants. The method includes that an electric field is formed by applying direct current at an anode end and a cathode end respectively, and the zero-valent iron is fed into a reactor and reacts with the pollutants in water under a sufficiently mixed hydraulic condition, so that water purification is achieved. The method has the advantages that water purifying effects are effectively improved through coupling between electrochemical action and the zero-valent iron action, so that the defects of activity declining and zero-valent iron packed bed hardening due to corrosion and passivation of traditional zero-valent iron surfaces are overcome, and zero-valent iron utilization efficiency is improved substantially; the technical principle includes that the zero-valent iron is disposed in the direct-current electric field, and on the basis of conventional chemical corrosion of the zero-valent iron, the electric field intensifies electrochemical corrosion effect of the zero-valent iron, so that the electron donating ability of the zero-valent iron is enhanced, and the problems of corrosion layer deposition and treatment effect declining are effectively avoided. The invention further provides the reactor for implementing the method.

Description

technical field [0001] The invention relates to a method for strengthening the reduction of zero-valent iron to remove pollutants, which belongs to the application field of water treatment technology. The invention proposes a method for removing pollutants such as arsenic and antimony in water by combining electrochemical oxidation / reduction, zero-valent iron, coagulation, adsorption and the like. Specifically, the present invention applies direct current at both ends of the cathode and anode to form an electric field, adds zero-valent iron between the reactors, and reacts with pollutants in the water under fully mixed hydraulic conditions to realize water purification. The present invention also provides an integrated reactor for realizing the above process. [0002] technical background [0003] The pollution of drinking water sources and the improvement of drinking water standards have become important driving forces for the development of drinking water purification tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/467C02F1/48C02F101/10C02F101/30
CPCC02F1/4678C02F1/463C02F1/481C02F2101/103C02F2101/30C02F2201/4614C02F2201/4619
Inventor 刘锐平兰华春齐增禄马百文刘会娟曲久辉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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