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A microplastic separation method based on air flotation method

A separation method and technology of microplastics, applied in solid separation, flotation, etc., can solve the problems of microplastics ingested into the body, damage; on the other hand, death, etc.

Active Publication Date: 2020-11-13
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, microplastics are easily ingested by organisms by mistake. On the one hand, they will cause physical damage to organisms; on the other hand, the pollutants enriched on their surface will be released in organisms, affecting the development of organisms. , and even lead to its death

Method used

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  • A microplastic separation method based on air flotation method
  • A microplastic separation method based on air flotation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A plurality of circular microplastic flakes with a diameter of 2 mm were weighed and fully dispersed in pure water to obtain a simulated dispersion liquid with microplastic pollution in stable suspension. The concentration of microplastic flakes in the simulated dispersion liquid was 1 g / L (176 / L), add the glycerol solution of triheptyl dodecyl ammonium iodide to the simulated dispersion liquid and stir well, the glycerol solution of triheptyl dodecyl ammonium iodide The mass concentration of alkyl ammonium iodide is 4%, and the mass volume ratio of the triheptyl dodecyl ammonium iodide glycerin solution and the simulated dispersion liquid is 30g: 1L,

[0029] Add hydrochloric acid aqueous solution with a solute mass fraction of 17% to the water obtained above and stir well. The mass volume ratio between the hydrochloric acid aqueous solution and the simulated dispersion liquid is 0.5g:1L, and then pass oxygen into the obtained water under stirring Produce aeration (ad...

Embodiment 2

[0041] Based on the device in the accompanying drawings of this plan, take the concentrated surface water body (before concentration, the microplastics in the surface water body are small flakes visible to the naked eye, and the average concentration is 1.3 / L; therefore, in the surface water body after concentration of 100 times The concentration of microplastics is 130 pieces / L. The 100-fold concentrated solution is sampled, filtered and weighed. The mass concentration of microplastics in the concentrated solution is 0.63g / L, which is convenient for calculating the amount of subsequent functional additives. Addition amount) Turn on the agitator 2 in the liquid storage tank 1 and stir fully, then open the valve 3, the water body will flow into the reaction tank 4 by itself, and feed FeCl at the same time 2 aqueous solution and H 2 o 2 Aqueous solution, control FeCl 2 and H 2 o 2 In the water body in the reaction tank 4, the amount concentration of the respective substances...

Embodiment 3

[0048] Take the soil sample polluted by microplastics, put the soil and pure water into the liquid storage tank 1 at a mass ratio of 1:10 for stirring and dispersion (the average concentration of microplastics in the water to be treated after dispersion in the liquid storage tank 1 is 14.4 / L), all the other cleaning operations are the same as in Example 2.

[0049] After sampling and testing, the average concentration of microplastics in the discharged purified water was 2.3 pieces / L.

[0050] For comparison:

[0051] On the basis of Example 3, without adding any triheptyl dodecyl ammonium iodide, by adding sodium chloride crystal powder to the reaction tank 4 for dissolution, the density of the water body in the air flotation tank 5 is the same as that of the subsequent agitation and aeration. Embodiment 3, all the other operations are the same as embodiment 3.

[0052] After sampling and testing, the average concentration of microplastics in the discharged purified water ...

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Abstract

The invention belongs to the technical field of a solid waste treatment method and particularly relates to a method for performing microplastic separation on the basis of a gas floatation method. Themethod comprises the following steps: adding ammonium triheptyl dodecyl iodide into water in which microplastic is dispersed, mixing completely, adding inorganic acid into the dispersing liquid, mixing completely, continuously introducing air or oxygen, enabling the introduced air or oxygen form bubbles in the dispersing liquid to ascend, driving the microplastic in the water to float while the bubbles ascend, and separating out a large amount of microplastic-containing liquid on the upper layer of the water to realize separation of the water and the microplastic.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment methods, in particular to a method for separating microplastics based on an air flotation method. Background technique [0002] Plastics and their products are widely used in industry, agriculture and daily life. The world uses no less than 240 million tons of plastics every year. Plastic residues in the environment can migrate long distances through external forces such as wind, rivers, and ocean currents, polluting every corner of the earth. Under the effects of photodegradation, chemical oxidation and biodegradation, plastics in natural waters are split into plastic fragments with a diameter of less than 5mm or even smaller, which are called microplastics. [0003] Microplastics have the characteristics of small particle size and large specific surface area in the environment, and are easy to adsorb other pollutants in the environment, including organic pollutants and heavy metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/018B03D1/22
Inventor 王琼杰汪金晓雪张勇王育来徐淑君孟冠华
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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