A method of magnetic field strengthening Hangjin 2# soil loaded with nanometer zero-valent iron to remove pollutants in water

Abstract

A magnetic field-strengthened Hangjin 2# soil-loaded nano-zero-valent iron method for removing pollutants in water, the composite magnetic material of Hangjin 2# soil-loaded nano-zero-valent iron is put into the polluted water in the complete mixing reactor, and the A magnetic field is applied around the mixing reactor, and the stirring is continued, and the composite magnetic material reacts quickly with pollutants, and the water body is purified. The invention is easy to use, does not consume any chemical substances, reduces the dose of chemicals, is green and energy-saving, and has good popularization and application value in actual water pollution control and restoration projects.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and relates to a method for treating waste water with magnetic field-strengthened loaded nanometer zero-valent iron. Background technique [0002] Since nano-zero-valent iron has the advantages of small particle size, large surface effect, and high reactivity, it is an excellent environmental functional material that can efficiently remove various pollutants in water, such as heavy metal ions, organic pollutants, etc. Therefore, nano The removal of water pollutants by zero-valent iron is a new pollution control technology developed in recent years. It is considered to be a major innovation in water and soil in-situ remediation technology, and has great application prospects. However, nano zero-valent iron also has the following disadvantages in preparation and application: [0003] (1) The large specific surface area and strong magnetism of nano-zero-valent iron make it easy to agg...

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Problems solved by technology

[0003] (1) The large specific surface area and strong magnetism of nano-zero-valent iron make it easy to agglomerate and form large particles in the process of preparation and application, resulting in a decrease in specific surface area and activity, which greatly affects its Value;

[0004] (2) The agglomeration of nano-zero-valent iron particles can also reduce its fluidity in water, making the detergent diffuse unevenly, making it difficult to completely contact with pollutants, reducing the possibility of its practical engineering application;

[0005] (3) The high activity of nano-zero-valent iron also makes it easy to be oxidized by non-target pollutants in the environment (such as water and oxygen), that is, the "spontaneous combustion" of nano-zero-valent iron. Reduced resistance, unable to degrade pollutants in the environment for a long time

[0008] (2) The source of raw materials for partial load is limited, and the cost of raw materials is high.

[0010] (4) The adsorption / flocculation performance of the loading material itself is limited, and most of them have no catalytic performance. How to better exert the reduction / adsorption / catalysis synergistic effect of the material and improve its removal rate of pollutants requires further research and development.

In water treatment, although there are also reports on the application of magnetic fields, they are all based on the mechanism of magnetic physical effects (such as magnetic flocculation, which does not involve chemical reactions), and the research on the use of magnetic fields to strengthen loaded nano-zero-valent iron to remove pollutants in water has not been reported yet.

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