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Method for restoring chromium contaminated soil through EDTMPA (ethylenediamine tetra methylenephosphonic acid)

A technology of ethylenediaminetetramethylenephosphonic acid and chromium-contaminated soil, which is applied in the field of leaching and remediation of chromium-contaminated soil, can solve problems such as lack of research, and achieve the effects of low environmental risk, high remediation efficiency, and strong biodegradability

Inactive Publication Date: 2014-04-09
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, EDTMPA is only used in water treatment and other industries at present, and there is a lack of related research on soil leaching and restoration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Accurately weigh 1.00 g of artificial chromium-contaminated soil samples, and the concentration of heavy metal chromium in the soil is 600 mg kg -1 , add EDTMPA solutions with concentrations of 1, 2, 3, 4, 5, 6, 7 mol / L according to the solid-to-liquid ratio of 1:25. Shake at room temperature for 12 h, then stand still for 12 h, centrifuge at 4000 r / min for 20 min, filter, and measure the content of heavy metal chromium in the supernatant, and repeat the treatment 3 times.

[0012] Table 1 Effect of EDTMPA on removal rate of heavy metal chromium.

[0013] Eluent concentration (mol / L) CK 1 2 3 4 5 6 7 Removal rate (%) 11 23 39 52 67 83 91 86

[0014] The results show that the removal rate of heavy metal Cr can reach 91% by using EDTMPA to remediate artificial chromium-contaminated soil by oscillating leaching.

Embodiment 2

[0016] Accurately weigh 1.00 g of artificial chromium-contaminated soil samples, and the concentration of heavy metal chromium in the soil is 1200 mg kg -1 According to the solid-liquid ratio of 1:25, EDTMPA solutions with concentrations of 1, 2, 4, 6, 8, 10, and 12 mol / L were added. Shake at room temperature for 12 h, then stand still for 12 h, centrifuge at 4000 r / min for 20 min, filter, and measure the content of heavy metal chromium in the supernatant, and repeat the treatment 3 times.

[0017] Table 2 Effect of EDTMPA on removal rate of heavy metal chromium.

[0018] Eluent concentration (mol / L) CK 1 2 4 6 8 10 12 Removal rate (%) 8 19 33 42 61 73 87 81

[0019] The results show that the removal rate of heavy metal Cr can reach up to 87% by oscillating leaching method and using EDTMPA to remediate artificial chromium-contaminated soil.

Embodiment 3

[0021] The chromium-contaminated soil collected in the chromium slag storage area of ​​Xinchengzi District, Shenyang was used for vibration leaching experiments, and the chromium concentration was 2300 mg kg -1 . Accurately weigh 1.00 g of contaminated soil samples, and add EDTMPA solutions with concentrations of 1, 2, 6, 10, 14, 18, and 22 mol / L according to the solid-to-liquid ratio of 1:25. Shake at room temperature for 12 h, then stand still for 12 h, centrifuge at 4000 r / min for 20 min, filter, and measure the content of heavy metal chromium in the supernatant, and repeat the treatment 3 times.

[0022] Table 3 Effect of EDTMPA on the removal rate of heavy metal chromium.

[0023] Eluent concentration (mol / L) CK 1 2 6 10 14 18 22 Removal rate (%) 9 21 31 42 55 76 83 79

[0024] The results show that the chromium-contaminated soil in the chromium slag storage area in Xinchengzi District was repaired with EDTMPA by means of oscillati...

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PUM

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Abstract

The invention relates to a method for restoring chromium contaminated soil through EDTMPA (ethylenediamine tetra methylenephosphonic acid), and the method has strong biodegradability and high leaching efficiency. The method comprises the following steps: accurately weighing 1.00 g of chromium contaminated soil sample, adding EDTMPA solution with the concentration of 1-22% according to a solid-to-liquid ratio of 1:25, and oscillating, stewing, centrifuging and filtering at room temperature to finish the leaching process, wherein the oscillating time is 12 hours, and the stewing time is 12 hours; the centrifugal rotating speed is 4,000 r / min, and the centrifuging time is 20 minutes; the concentration of the chromium polluted soil is 600-2,300 mg.kg<-1>. The measure of forcefully restoring the chromium contaminated soil by EDTMPA is adopted in the invention, and the method has the advantages of high restoring efficiency, strong operability, low environmental risk, and the like.

Description

technical field [0001] The invention relates to the technical field of leaching and restoration of chromium-contaminated soil, in particular to a method for repairing chromium-contaminated soil by using ethylenediaminetetramethylenephosphonic acid. Background technique [0002] Cr is a kind of highly toxic inorganic pollutants with certain potential hazards. It can be enriched in soil crops and organisms, and has great harm to the growth, yield and quality of crops. In particular, it can also be enriched and absorbed by crops. , into the food chain, has the potential harm to human and animal health. A large amount of industrial chromium-containing wastes, industrial wastewater, cement, metallurgy and other industries, waste gas from petroleum and coal combustion, chromium slag produced in chemical production, etc., have caused a large amount of chromium to enter the soil system, which has seriously threatened the ecological environment and human beings. Health, soil chromiu...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 崔爽赵杉林李萍刘艺芸孙秀菊
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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