CN115959808A - Remediation method for removing heavy metal pollution of river and lake bottom mud - Google Patents
Remediation method for removing heavy metal pollution of river and lake bottom mud Download PDFInfo
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- CN115959808A CN115959808A CN202211716499.7A CN202211716499A CN115959808A CN 115959808 A CN115959808 A CN 115959808A CN 202211716499 A CN202211716499 A CN 202211716499A CN 115959808 A CN115959808 A CN 115959808A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A20/402—River restoration
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Abstract
The invention discloses a remediation method for removing heavy metal pollution of river and lake bottom mud, which relates to the technical field of treatment of heavy metal in river and lake bottom mud, and comprises the following steps: putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent; the preparation method of the magnetic adsorbent comprises the following steps of; uniformly mixing magnetic particles, biomass and a binder solution, then granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle. The magnetic adsorbent is adopted, so that the sediment is adsorbed on one hand, and can be conveniently recovered on the other hand, and the magnetic adsorbent adopted by the invention has abundant pore structures and multiple pore structures after being sintered, so that the effect on heavy metal is very excellent.
Description
Technical Field
The invention relates to the technical field of heavy metal treatment of river and lake bottom mud, in particular to a restoration method for removing heavy metal pollution of river and lake bottom mud.
Background
With the acceleration of the urbanization process and the rapid development of economy, a large amount of industrial wastewater and domestic sewage are discharged into a water body without being treated or not reaching the standard, and meanwhile, some pollutants enter an earth surface water body through the processes of atmospheric sedimentation, rainwater leaching, flood scouring, farmland water discharge and the like. Because the heavy metal is not easy to biodegrade and rapidly migrates into suspended matters and bottom mud and is continuously enriched, the problem of heavy metal pollution of the bottom mud of water bodies such as rivers, lakes and the like is obvious. The polluted bottom mud can directly or indirectly produce toxic and harmful effects on benthos or overlying water organisms, influence the health of terrestrial organisms and human beings through processes of biological enrichment, food chain amplification and the like, harm an ecological system and form secondary pollution.
Thus, the river bottom mud needs to be repaired.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides a method for repairing heavy metal pollution of bottom mud of rivers and lakes.
The technical solution of the invention is as follows:
a restoration method for removing heavy metal pollution of river and lake bottom mud comprises the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
uniformly mixing magnetic particles, biomass and a binder solution, then granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle.
As a preferable embodiment of the present invention, the magnetic particles are iron powder and/or ferroferric oxide.
In a preferred embodiment of the present invention, the biomass is crop waste or tree waste.
In a preferred embodiment of the present invention, the binder solution is 10 to 30wt% of sodium carboxymethyl cellulose.
In a preferred embodiment of the present invention, the particle size of the vermiculite powder is 10-40 microns.
As a preferable scheme of the invention, the sintering temperature is 600-900 ℃.
In a preferred embodiment of the present invention, the magnetic adsorbent is impregnated in an active agent solution after sintering.
In a preferred embodiment of the present invention, the active agent solution is citric acid.
As a preferable scheme of the invention, the dipping is ultrasonic dipping for 10-30min.
The beneficial effects of the invention are:
according to the method for restoring heavy metal pollution removal of the river and lake sediment, the magnetic adsorbent is adopted, on one hand, the sediment is adsorbed, on the other hand, the sediment can be conveniently recovered, the magnetic adsorbent adopted by the method is formed by mixing biomass and magnetic particles, then wrapping a layer of vermiculite powder, sintering the mixture to form carbon particles from the biomass, the carbon particles have rich pore structures, the outer shell structure is formed by heating vermiculite and also has rich pore structures, and the multiple pore structures enable the heavy metal effect to be excellent, in addition, the activated sludge is soaked in an activating agent solution after being sintered again, the activating agent can enable heavy metals in the sediment to be dissolved out more easily, and then the heavy metals are adsorbed by pore channels more easily after being dissolved out, and the heavy metal adsorption capacity is greatly improved.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example 1
A remediation method for removing heavy metal pollution of river and lake bottom mud comprises the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
and (2) mixing the following components in a mass ratio of 4:1:1, uniformly mixing the magnetic particles, the biomass and the binder solution, then granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle.
The magnetic particles are ferroferric oxide.
The biomass is crop waste (straw).
The binder solution was 10wt% sodium carboxymethylcellulose.
The particle size of the vermiculite powder is 10 microns.
The sintering temperature was 700 ℃.
After sintering, the magnetic adsorbent is ultrasonically immersed in the activator solution for 10min.
The active agent solution is citric acid.
Example 2
A restoration method for removing heavy metal pollution of river and lake bottom mud comprises the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
mixing the following components in a mass ratio of 5:1:1, uniformly mixing the magnetic particles, the biomass and the binder solution, then granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle.
The magnetic particles are iron powder.
The biomass is crop waste (straw).
The binder solution was 20wt% sodium carboxymethylcellulose.
The particle size of the vermiculite powder is 20 microns.
The sintering temperature is 900 ℃.
After sintering, the magnetic adsorbent is ultrasonically immersed in the activator solution for 20min.
The active agent solution is citric acid.
Example 3
A restoration method for removing heavy metal pollution of river and lake bottom mud comprises the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
mixing the following components in percentage by mass 6:1:1, uniformly mixing the magnetic particles, the biomass and the binder solution, then granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle.
The magnetic particles are iron powder.
The biomass is crop waste (straw).
The binder solution was 30wt% sodium carboxymethylcellulose.
The particle size of the vermiculite powder is 35 microns.
The sintering temperature was 850 ℃.
After sintering, the magnetic adsorbent was ultrasonically immersed in the activator solution for 25min.
The active agent solution is citric acid.
Example 4
A remediation method for removing heavy metal pollution of river and lake bottom mud comprises the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
mixing the following components in a mass ratio of 3:1:1, uniformly mixing the magnetic particles, the biomass and the binder solution, then granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle.
The magnetic particles are ferroferric oxide.
The biomass is crop waste (straw).
The binder solution is 10-30wt% sodium carboxymethylcellulose.
The particle size of the vermiculite powder is 10-40 microns.
The sintering temperature is 600-900 ℃.
After sintering, the magnetic adsorbent is ultrasonically immersed in the activator solution for 30min.
The active agent solution is citric acid.
Example 5
A restoration method for removing heavy metal pollution of river and lake bottom mud comprises the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
and (2) mixing the following components in a mass ratio of 4:1:1, uniformly mixing the magnetic particles, the biomass and the binder solution, then granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle.
The magnetic particles are iron powder.
The biomass is crop waste (straw).
The binder solution was 25wt% sodium carboxymethylcellulose.
The particle size of the vermiculite powder is 35 microns.
The sintering temperature is 750 ℃.
After sintering, the magnetic adsorbent is ultrasonically immersed in the activator solution for 30min.
The active agent solution is citric acid.
Comparative example 1 (No Biomass)
A remediation method for removing heavy metal pollution of river and lake bottom mud comprises the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
mixing the following components in a mass ratio of 4:1, uniformly mixing the magnetic particles and the binder solution, granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle.
The magnetic particles are iron powder.
The binder solution was 25wt% sodium carboxymethylcellulose.
The particle size of the vermiculite powder is 35 microns.
The sintering temperature is 750 ℃.
After sintering, the magnetic adsorbent is immersed in the activator solution by ultrasonic wave for 30min.
The active agent solution is citric acid.
COMPARATIVE EXAMPLE 2 (without vermiculite)
A restoration method for removing heavy metal pollution of river and lake bottom mud comprises the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
mixing the following components in a mass ratio of 4:1:1, uniformly mixing the magnetic particles, the biomass and the binder solution, then granulating, and then sintering to obtain the magnetic particle-biomass composite material.
The magnetic particles are iron powder.
The biomass is crop waste (straw).
The binder solution was 25wt% sodium carboxymethylcellulose.
The sintering temperature is 750 ℃.
After sintering, the magnetic adsorbent is ultrasonically immersed in the activator solution for 30min.
The active agent solution is citric acid.
Comparative example 3 (no active agent)
A restoration method for removing heavy metal pollution of river and lake bottom mud comprises the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
and (2) mixing the following components in a mass ratio of 4:1:1, uniformly mixing the magnetic particles, the biomass and the binder solution, then granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle.
The magnetic particles are iron powder.
The biomass is crop waste (straw).
The binder solution was 25wt% sodium carboxymethylcellulose.
The particle size of the vermiculite powder is 35 microns.
The sintering temperature is 750 ℃.
The above examples and comparative examples were subjected to performance tests, and the test results are shown in the following table.
The above examples and comparative examples were carried out in river and lake areas to be treated (specifically in the case of treatment in dry water, before treatment, a sediment test (water temperature 30 ℃, initial pH 5.0, heavy metal Cd content M0, heavy metal Cd content M1 tested after treatment with the adsorbent according to the above examples, removal rate = (M0-M1)/M0 was calculated.
The embodiment has higher heavy metal removal rate than the comparative example mainly because the embodiment adopts the magnetic adsorbent to mix the biomass and the magnetic particles, and then wraps a layer of vermiculite powder, the biomass is formed into carbon particles after sintering, the carbon particles have rich pore structures, the external shell structure is that vermiculite also has rich pore structures after being heated, and the heavy metal effect is excellent due to the multiple pore structures, and in addition, the heavy metal is soaked in an activator solution after being sintered, the activator can enable heavy metals in bottom mud to be dissolved out more easily, and then the heavy metal is adsorbed by pore channels more easily after being dissolved out, so that the heavy metal adsorption capacity is greatly improved.
The above additional technical features can be freely combined and used in superposition by those skilled in the art without conflict.
The above description is only a preferred embodiment of the present invention, and the technical solutions that achieve the objects of the present invention by substantially the same means are within the protection scope of the present invention.
Claims (9)
1. A restoration method for removing heavy metal pollution of river and lake bottom mud is characterized by comprising the following steps:
putting a magnetic adsorbent into a river and lake area to be treated, allowing the magnetic adsorbent to settle to the bottom for adsorption, and applying an external magnetic field after adsorption is finished to recover the magnetic adsorbent;
the preparation method of the magnetic adsorbent comprises the following steps of;
uniformly mixing magnetic particles, biomass and a binder solution, then granulating, spraying the binder solution on the surfaces of the granulated particles, coating a layer of vermiculite powder on the surfaces of the granulated particles, and sintering to obtain the magnetic particle.
2. The method for remediating the heavy metal pollution of the river and lake bottom sludge according to claim 1, wherein the magnetic particles are iron powder and/or ferroferric oxide.
3. The remediation method for heavy metal pollution removal from river and lake bottom mud according to claim 1, wherein the biomass is crop waste or tree waste.
4. The method for remediating the heavy metal pollution of the river and lake bottom sludge as claimed in claim 1, wherein the binder solution is 10-30wt% of sodium carboxymethyl cellulose.
5. The method for remediating heavy metal pollution of river and lake bottom mud according to claim 1, wherein the particle size of the vermiculite powder is 10-40 microns.
6. The method for remediating the heavy metal pollution of the river and lake bottom sludge according to claim 1, wherein the sintering temperature is 600-900 ℃.
7. The method for remediating heavy metal pollution of river and lake bottom mud according to claim 1, wherein after sintering, the magnetic adsorbent is immersed in an active agent solution.
8. The method for remediating the heavy metal pollution of the river and lake bottom sludge as claimed in claim 7, wherein the active agent solution is citric acid.
9. The remediation method for heavy metal pollution removal from river and lake bottom mud according to claim 7, wherein the soaking is ultrasonic soaking for 10-30min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117548477A (en) * | 2024-01-12 | 2024-02-13 | 自然资源部第二海洋研究所 | Sediment heavy metal pollution restoration method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117548477A (en) * | 2024-01-12 | 2024-02-13 | 自然资源部第二海洋研究所 | Sediment heavy metal pollution restoration method |
| CN117548477B (en) * | 2024-01-12 | 2024-04-09 | 自然资源部第二海洋研究所 | Sediment heavy metal pollution restoration method |
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