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Method for restoring lead polluted soil by rinsing

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

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, PASP is only used in water treatment and other industries, 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

[0010] Take a PVC elution column with an inner diameter of 5 cm and a height of 15 cm. Drill 16 small holes evenly at the bottom of the washing column, and fix two layers of filter paper on the bottom. Accurately weigh 100.00 g of artificially polluted soil and put it into the column, the concentration of heavy metal lead in the soil is 1000 mg·kg -1 . PASP solutions with a soil-to-liquid ratio of 1:4 and concentrations of 1, 2, 4, 6, 8, 10, and 12 mol / L were added at one time to the upper end of the soil column. After the leaching was completed, the content of heavy metal lead in the eluent was determined, and each treatment was repeated 3 times.

[0011] Table 1 Effect of PASP concentration on the removal rate of heavy metal lead

[0012] Eluent concentration (mol / L) CK 1 2 4 6 8 10 12 Removal rate (%) 9 18 35 68 79 76 75 73

[0013] The results show that the removal rate of heavy metal Pb can reach up to 79% by using the soil column l...

Embodiment 2

[0015] Take a PVC elution column with an inner diameter of 5 cm and a height of 15 cm. Drill 16 small holes evenly at the bottom of the washing column, and fix two layers of filter paper on the bottom. Accurately weigh 100.00 g and the concentration is 2000 mg·kg -1 The artificially polluted soil was put into the column, and the PASP solution with a soil-liquid ratio of 1:1-1:5 and a concentration of 12 mol / L was added to the top of the column at one time. After the leaching was completed, the content of heavy metal lead in the eluent was determined, and each treatment was repeated 3 times.

[0016] Table 2 The effect of soil-liquid ratio on the removal rate of heavy metal lead

[0017] Soil to Liquid Ratio 1:1 1:2 1:3 1:4 1:5 Removal rate (%) 26 47 56 76 74

[0018] The results show that the removal rate of heavy metal Pb can reach up to 76% by using the soil column leaching method and using PASP to remediate the artificial lead-contaminated so...

Embodiment 3

[0020] Take a PVC elution column with an inner diameter of 5 cm and a height of 15 cm. Drill 16, 12, 8, 4, and 2 small holes evenly at the bottom of the elution column (that is, the elution time is 30, 60, 120, 180, and 210 min, respectively), and fix two layers of filter paper on the bottom. Accurately weigh 100.00 g and the concentration is 3000 mg·kg -1 The artificially polluted soil was put into the column, and the PASP solution with a soil-liquid ratio of 1:4 and a concentration of 18 mol / L was added to the top of the column at one time. After the leaching was completed, the content of heavy metal lead in the eluent was determined, and each treatment was repeated 3 times.

[0021] Table 3 Effect of leaching time on the removal rate of heavy metal lead

[0022] Rinse time (min) 30 60 120 180 210 Removal rate (%) 31 51 66 78 71

[0023] The results show that the removal rate of heavy metal Pb can reach up to 78% by using the soil column leach...

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PUM

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Abstract

The invention relates to a method for restoring lead polluted soil by rinsing, which has the advantages of higher biodegradability and higher rinsing efficiency. The method comprises the following steps: taking a PVC (polyvinyl chloride) rinsing column of which the internal diameter is 5cm and the height is 15cm, making pinholes in the bottom of the rinsing column, fixing filter paper to the bottom, accurately weighing 100.00g of lead polluted soil, filling the lead polluted soil into the column, and adding a 1-24 mol / L PASP (polyaspartic acid) solution to the upper end of the soil column at one time in a soil-to-liquid ratio of 1:1-1:5; and after finishing rinsing, determining the content of the heavy metal lead in the rinsing liquid.2-16 pinholes are uniformly made in the bottom of the rinsing column. The filter paper fixed to the bottom is composed of two layers. The lead concentration of the polluted soil is 1000-4020 mg.kg<-1>. By using the PASP for reinforced restoration of the lead 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 lead-contaminated soil, in particular to a method for leaching and restoration of lead-contaminated soil. Background technique [0002] In recent years, along with mining, urbanization, transportation, farmland sewage irrigation, sludge agricultural use, etc., it has caused increasingly serious global lead pollution. The toxic effects of lead on the human body are latent and long-term. Due to the continuous occurrence of lead poisoning incidents, the research on lead pollution and lead poisoning has been paid more and more attention by scholars at home and abroad. Studies have shown that there is a direct relationship between human blood lead levels and soil lead content. To finally solve the problem of lead pollution, on the one hand, the sources of pollution should be reduced, and on the other hand, the polluted soil should be treated and repaired. [0003] Leaching techno...

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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