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Soil flushing agent and application of soil flushing agent to aspect of polluted soil remediation

A soil leaching and polluted soil technology, applied in the field of soil remediation, can solve the problems of long residence time, unfavorable pollution soil treatment, micro-agglomeration structure damage, etc., achieve good removal effect, good repair effect, and short leaching time

Inactive Publication Date: 2017-09-22
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the artificial chelating agent eluent has a good effect on the removal of heavy metals, but it has a poor effect on the removal of organic pollutants, and its own structure is stable, it is difficult to biodegrade, and it stays in the soil for a long time, which is easy to cause secondary pollution.
Acid eluent also has a good removal effect on heavy metals, but the removal effect on organic pollutants is also not good, and has a strong destructive effect on the original micro-aggregate structure of the soil, which is not conducive to the treatment of polluted soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of soil washing agent provided by the invention preferably comprises the following steps:

[0026] Mixing water and polyaspartic acid to obtain a mixed solution;

[0027] The pH of the mixed liquid is adjusted to 3-5 by using nitric acid to obtain a soil washing agent.

[0028] The present invention has no special requirements on the mixing method of the water and polyaspartic acid, as long as the two can be mixed evenly and the polyaspartic acid is completely dissolved. The present invention has no special requirements on the concentration of the nitric acid, and any concentration can be used. In a specific embodiment of the invention, the concentration of the nitric acid is preferably 10wt%-40wt%, more preferably 15wt%-35wt%. In the present invention, the water content in the nitric acid is not included in the mass fraction of the soil washing agent water.

[0029] The soil washing agent provided by the invention uses polyaspartic acid as an a...

Embodiment 1

[0037] 16 parts by mass of polyaspartic acid and 84 parts of water were mixed, and 20 wt% nitric acid was used to adjust the pH value of the mixed solution to 4 to obtain a soil washing agent.

[0038] Application test:

[0039] Put 1 g of heavy metal organic matter contaminated soil and 9 ml of the above soil eluent into a centrifuge tube, place the centrifuge tube in an ultrasonic cleaner for the first ultrasonic wave, control the temperature at 20 °C, frequency 50 kHz, power 300 watts, and ultrasonic for 35 minutes ;

[0040] Take out the centrifuge tube, place it in a centrifuge, perform centrifugation at a rate of 7500 rpm for 15 minutes, pour off the supernatant, and obtain a solid centrifuge;

[0041] Add 9 ml of deionized water to the centrifuge tube, place it in an ultrasonic cleaner for the second ultrasonic wave at room temperature, frequency 50 kHz, power 300 watts, and ultrasonic for 35 minutes; The centrifugation was carried out for 15 minutes at a high speed, ...

Embodiment 2

[0046]18 parts by mass of polyaspartic acid and 82 parts of water were mixed, and 25 wt% nitric acid was used to adjust the pH value of the mixed solution to 3 to obtain a soil washing agent.

[0047] Application test:

[0048] Put 2g of soil contaminated by heavy metal organic matter and 10ml of the above soil eluent into a centrifuge tube, place the centrifuge tube in an ultrasonic cleaner for the first ultrasonic wave, control the temperature at 20°C, frequency 40kHz, power 350W, and ultrasonic for 30 minutes ;

[0049] Take out the centrifuge tube, place it in a centrifuge, perform centrifugation at a rate of 7000 rpm for 20 minutes, pour off the supernatant, and obtain a solid centrifuge;

[0050] Add 10 ml of deionized water to the centrifuge tube, place it in an ultrasonic cleaner for the second ultrasonic wave at room temperature, frequency 45kHz, power 350 watts, ultrasonic for 35 minutes; The centrifugation was carried out at a high speed for 12 minutes, and the su...

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Abstract

The invention discloses a soil flushing agent and the application of the soil flushing agent to the aspect of polluted soil remediation. The soil flushing agent comprises the following components in parts by mass: 80-88 parts of water and 12-20 parts of polyaspartic acid; the soil flushing agent further comprises nitric acid; and according to the adding amount of nitric acid, the pH value of the soil flushing agent can be adjusted to 3-5. The soil flushing agent disclosed by the invention can be applied to the aspect of polluted soil remediation; the components of the soil flushing agent are simple, the soil flushing agent is environmentally friendly and free from pollution, and the secondary pollution to soil is prevented; polluted soil is remedied by using the soil flushing agent through an ultrasonic flushing method; the soil flushing agent has the advantages that the flushing period is short and the remediation effect is good; and both heavy metals and organic pollutants in the soil can be removed simultaneously.

Description

technical field [0001] The invention relates to the technical field of soil repair, in particular to a soil washing agent and its application in repairing polluted soil. Background technique [0002] In recent years, the problem of soil pollution has become increasingly serious. Soil pollution mainly includes heavy metal pollution and organic pollution. The accumulation of pollutants such as heavy metals and organic matter leads to the disorder of normal soil function, the decline of soil quality, and affects the growth and development of crops, as well as the decline in yield and quality, and further affects the environment and human health. [0003] At present, the methods commonly used to remediate polluted soil can be divided into three categories: physical remediation, chemical remediation, and biological remediation. Among them, chemical restoration has many advantages such as short treatment period, remarkable treatment effect and low cost. Commonly used eluents in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08C09K17/40C09K109/00
CPCB09C1/02B09C1/08C09K17/40C09K2109/00
Inventor 胡晓钧姜伟杰汪波田富箱
Owner SHANGHAI INST OF TECH
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