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A zero-valent iron water purification method and reactor based on electromagnetic synergistic strengthening

A technology of reactor and zero-valent iron, applied in chemical instruments and methods, magnetic field/electric field water/sewage treatment, water pollutants, etc., can solve the problems of decreased activity, difficult control of corrosion efficiency, low utilization efficiency of zero-valent iron, etc. , to achieve the effect of overcoming the decline in activity, improving the effect and improving the utilization rate

Active Publication Date: 2019-11-19
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 shortcomings of zero-valent iron in the process of treating pollutants such as difficult to control corrosion efficiency, greatly reduced activity due to surface passivation after a certain period of operation, and low utilization efficiency of zero-valent iron, the invention proposes a zero-valent iron that comprehensively utilizes electric field and magnetic field strengthening. Methods of Iron Purification of Pollutants

Method used

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  • A zero-valent iron water purification method and reactor based on electromagnetic synergistic strengthening
  • A zero-valent iron water purification method and reactor based on electromagnetic synergistic strengthening
  • A zero-valent iron water purification method and reactor based on electromagnetic synergistic strengthening

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Embodiment 1

[0035] The outermost plate of the reactor is made of titanium mesh and activated carbon fiber; the middle plate is made of titanium mesh, activated carbon fiber, conductive glass, graphite and iron plate, which are arranged at intervals, and the distance between the plates is 5mm; the magnet is made of copper nickel Iron permanent magnet, the magnetic field strength is 0.01T; 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.

[0036]Adjust the pH value of the water to be treated to 2.8, adjust the DC power supply current to 10mA, and the current density to 0.1mA / 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

[0038] The outermost pole plates of the reactor are made of diamond and graphite; the middle pole plates are made of three kinds of titanium mesh, aluminum plate and iron plate, arranged at intervals, and the distance between the pole plates is 5mm; the magnet is made of ferrite permanent magnet, and the magnetic field strength is 0.3T ; The effective volume of the reactor is 5.0L. Put the iron powder in the reactor, and use the air to stir and mix; the DC power supply performs the pole inverting operation every 30 minutes.

[0039] Adjust the pH value of the water to be treated to 3.2, adjust the DC power supply current to 50mA, 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

[0041] The outermost pole plate of the reactor is made of conductive glass or graphite; the middle pole plate is made of activated carbon fiber, and the distance between the pole plates is 20mm; the magnet is electromagnet, and the magnetic field strength is 1.0T; 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 20 minutes.

[0042] The pH value of the water to be treated is adjusted to 4.5, the DC power supply current is adjusted to 60mA, and the current density is 8mA / cm2; the concentration of nitrobenzene in the water to be treated is 1mg / L, and the concentration of nitrobenzene drops by 80% after passing through the reactor.

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Abstract

The invention provides a method used for electric field and magnetic field synergetic strengthening of zero-valent iron reduction, and removing heavy metals and organic pollutants in water via combination of electrochemical oxidation, coacervation, and absorption effects. According to the method, a negative electrode and a positive electrode are provided with direct current so as to form an electric field; zero-valent iron is introduced into a space between the negative electrode and the positive electrode, a permanent magnet is arranged in a direction vertical to the direction of the electricity field to provide a magnetic field; pollutants in water flow through the zero-valent iron water purifying reactor, and reaction of the pollutants with zero-valent iron in water is carried out so as to realize water purifying. According to the technical principles of the method, zero-valent iron is placed in a system provided with a direct-current electric field and a magnetic field at the same time, electrochemical corrosion effect is strengthened via synergetic strengthening effect of the electric field and the magnetic field based on common zero-valent iron chemical corrosion, and electron donating ability and reducing capacity of zero-valent iron are improved, so that dissociation and desorption of corrosion products form material surfaces are accelerated, a problem of treatment effect deterioration is caused by deposition of corrosion layers on the surface of zero-valent iron is solved. The invention also provides an integrated reactor used for realizing the above processing process.

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 synergistically strengthening the reduction of zero-valent iron by using an electric field and a magnetic field, and combining electrochemical oxidation, coagulation, adsorption and the like to jointly remove heavy metals and organic pollutants in water. Specifically, the present invention applies direct current at both ends of the cathode and the anode to form an electric field, introduces zero-valent iron between the cathode and the anode, and sets a permanent magnet in a direction perpendicular to the electric field to provide a magnetic field. The pollutants in the water flow through the reactor and the zero-valent iron in the water Valence iron reacts to purify water. The present invention also provides an integrated reactor for realizing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/467C02F1/48C02F101/20C02F101/30
CPCC02F1/4672C02F1/4678C02F1/481C02F1/484C02F2101/20C02F2101/30C02F2201/4614
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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