Washing system for removing lead in polluted soil

A contaminated soil and leaching technology, which is applied in the field of soil pollution remediation, can solve problems such as limited research, and achieve the effects of easy preparation, low cost, and improved leaching efficiency

Inactive Publication Date: 2016-08-24
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on eutectic ionic liquids is still in the initial stage, and the research on the dissolution of metal compounds is still very limited, and the research on the extraction / leaching agent of heavy metals in soil is even less reported.

Method used

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  • Washing system for removing lead in polluted soil
  • Washing system for removing lead in polluted soil
  • Washing system for removing lead in polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Sequentially weigh 0.500g soil samples into a series of 15mL centrifuge tubes, add 0.2mol / L oxalic acid respectively, and then add 1%, 2%, 3%, 4%, 5% of the total liquid volume of choline chloride / urea ionic liquid. Shake at constant temperature for 4 hours, centrifuge at 4000r / min for 20 minutes, take 1ml of the supernatant in a 25ml colorimetric tube, and use 1.5% HNO 3 Prepare the test at constant volume, and each group has 3 parallels. The removal effects of different volumes of choline chloride / urea ionic liquid on lead in soil are shown in Table 1.

[0021] Table 1

[0022]

Embodiment 2

[0024] Sequentially weigh 0.500g soil samples into a series of 15mL centrifuge tubes, add 3% choline chloride / urea ionic liquid, and then add oxalic acid with a concentration of 0.2mol / L respectively, and fix the liquid-solid ratio at 5:1, 7.5: 1. 10:1, 12.5:1, 15:1, 20:1, shake at constant temperature for 4 hours, centrifuge at 3500r / min for 15 minutes, take 1ml of the supernatant in a 25ml colorimetric tube, and use 1.5% HNO 3 Prepare the test at a constant volume, and each group has 3 parallels. The removal effects of different liquid-solid ratios on the lead in the soil are shown in Table 2.

[0025] Table 2

[0026]

Embodiment 3

[0028] Sequentially weigh 0.500g soil samples into a series of 15mL centrifuge tubes, add 3% choline chloride / urea ionic liquid, and then add 9.7mL oxalic acid with a concentration of 0.2mol / L, and fix the liquid-solid ratio at 20:1 , shake at constant temperature for 1h, 2h, 3h, 3.5h, 4h, 4.5h, 6h, centrifuge at 4000r / min for 20min, take 1ml of the supernatant in a 25ml colorimetric tube, and use 1.5% HNO 3 Prepare the test at a constant volume, and each group has 3 parallel samples. The removal effects of different oscillation times on lead in the soil are shown in Table 3.

[0029] table 3

[0030]

[0031] control group

[0032] Weigh 0.500g of soil samples in sequence into a series of 15mL centrifuge tubes, and add 10mL of oxalic acid with concentrations of 0.01, 0.03, 0.05, 0.10, 0.15, 0.20, and 0.40mol / L, respectively. Shake at constant temperature for 4 hours, centrifuge at 4000r / min for 20 minutes, take 1ml of the supernatant in a 25ml colorimetric tube, and use ...

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Abstract

The invention discloses a washing system for removing lead in polluted soil. The washing system comprises ionic liquid containing choline chloride and urea and oxalic acid. A preparation method of the washing system comprises the following steps that the urea and the choline chloride are weighed correspondingly, subjected to vacuum drying, mixed evenly, and heated and stirred for 0.5 h in an oil bath at the temperature of 100 DEG C, and colorless and thick liquid, namely ionic liquid with the choline chloride and the urea, is obtained; and finally the oxalic acid and the ionic liquid with the choline chloride and the urea are fully and evenly mixed, so that the washing system is obtained. According to a use method of the washing system, the polluted soil is taken and added into the washing system for removing the lead in the polluted soil, mixing and vibration washing is carried out, and then remediation of the lead polluted soil is finished. The washing system for removing the lead in the polluted soil has the advantages of being low in cost, environmentally friendly, easy to prepare, efficient and the like, the washing efficiency is improved through the synergistic effect of the eutectic ionic liquid and the organic acid, and the washing system can be applied to treatment of soil in mining areas, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of soil pollution restoration, in particular to a leaching system for removing lead in polluted soil. Background technique [0002] Soil heavy metal pollution remediation technology is one of the hot issues at present. The principle of heavy metal contaminated soil remediation technology is mainly through solidification and activation, and correspondingly developed physical remediation, chemical remediation and phytoremediation technologies. Chemical remediation techniques include chemical fixation, chemical extraction, and soil washing techniques. Soil leaching technology is one of the most reported soil remediation technologies at present. It has the advantages of high remediation efficiency, quick effect, less investment and consumption, and can be used to treat high and medium levels of polluted soil. [0003] The key to soil leaching restoration technology is to find an economical and efficient leaching system w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08
Inventor 高云涛高金婷熊华斌李晓芬郑琰魏薇
Owner YUNNAN MINZU UNIV
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