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Rinsing agent for restoring heavy metal chromium polluted soil

A technology for chromium-contaminated soil and heavy metals, applied in the field of leaching and remediation of chromium-contaminated soil, can solve the problems of lack of research and achieve the effects of low environmental risk, strong biodegradability and strong operability

Inactive Publication Date: 2014-03-19
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, at present, PESA is only used in water treatment and other industries, and there is a lack of related research on soil leaching and remediation.

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 According to the solid-to-liquid ratio of 1:25, PESA solutions with concentrations of 1, 5, 10, 15, 20, 25, and 30% 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.

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

[0013] Eluent concentration (%) CK 1 5 10 15 20 25 30 Removal rate (%) 8 18 45 77 91 87 88 85

[0014] The results show that the removal rate of heavy metal Cr can reach up to 91% by using PESA to remediate the 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-to-liquid ratio of 1:25, PESA solutions with concentrations of 5, 10, 15, 20, 30, 40, and 50% 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 PESA on the removal rate of heavy metal chromium.

[0018] Eluent concentration (%) CK 5 10 15 20 30 40 50 Removal rate (%) 10 21 39 52 72 89 85 83

[0019] The results show that the maximum removal rate of heavy metal Cr can reach 89% by using PESA to remediate the artificial chromium-contaminated soil by means of oscillation leaching.

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 PESA solutions with concentrations of 10, 20, 30, 40, 50, 60, and 70% 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 The effect of PESA on the removal rate of heavy metal chromium.

[0023] Eluent concentration (%) CK 10 20 30 40 50 60 70 Removal rate (%) 9 21 35 43 55 69 87 80

[0024] The results show that the chromium-contaminated soil in the chromium slag storage area can be repaired by PESA by means of oscillating leaching, and the removal r...

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PUM

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Abstract

The invention relates to a rinsing agent for restoring heavy metal chromium polluted soil, which has the advantages of higher biodegradability and higher rinsing efficiency. The rinsing agent is prepared by the following steps: accurately weighing 1.00g of chromium polluted soil sample, adding a 10-70% PESA (polyepoxysuccinic acid) solution in a solid-to-liquid ratio of 1:25, oscillating at room temperature, standing, centrifugating and filtering to complete the rinsing process, wherein the oscillation time is 12 hours, the standing time is 12 hours, the centrifugating speed is 4000 r / min, and the centrifugating time is 20 minutes. The chromium concentration of the polluted soil is 600-2300 mg.kg<-1>. By using the PESA for reinforced restoration of the chromium polluted soil, the method has the characteristics of high restoration efficiency, high 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, and relates to a leaching agent for repairing heavy metal chromium-contaminated soil by using polyepoxysuccinic acid and a method for using the same. Background technique [0002] As one of the five toxic elements, Cr has obvious three-causing effects, and it is also one of the important indicators of industrial pollution. A large amount of untreated Cr-containing three wastes are directly discharged into the environment, seriously destroying the dynamic balance of the soil and leading to the deterioration of environmental quality. . Excessive Cr content in the environment can significantly inhibit the growth of animals and plants, and seriously affect the absorption of nutrients by crops. After Cr compounds invade the human body, they mainly accumulate in the viscera and endocrine system, further damaging human health. In recent years, human activ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 崔爽赵杉林李萍张启凯商丽艳
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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