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Chemical leaching restoration method for copper-contaminated soil

A technology of chemical leaching and remediation method, applied in the field of leaching and remediation of copper-contaminated soil, can solve problems such as lack of research, and achieve the effects of low environmental risk, strong operability, and high remediation efficiency

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, at present, BHMTPMPA 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] Air-dry the collected non-polluted soil samples, remove plant residues and soil clods, and store them in a dry place after passing through a 10-mesh sieve. Take the above soil sample through a 40-mesh sieve, and add a certain amount of CuSO 4 ·5H 2 O, fully mixed, so that the concentration of heavy metal copper in the artificially polluted soil reaches 800 mg·kg -1 .

[0011] 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 load it into the column. BHMTPMPA solutions with a soil-to-liquid ratio of 1:4 and concentrations of 1, 2, 6, 10, 14, 18, and 22 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 copper in the eluent was measured, and each treatment was repeated 3 times.

[0012] Ta...

Embodiment 2

[0016] 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 1000 mg·kg -1 The artificially polluted soil was put into the column, and the BHMTPMPA solution with a soil-liquid ratio of 1:1-1:5 and a concentration of 14 mol / L was added to the top of the column at one time. After the leaching was completed, the content of heavy metal copper in the eluent was measured, and each treatment was repeated 3 times.

[0017] Table 2 Effect of soil-liquid ratio on the removal rate of heavy metal copper

[0018] Soil to Liquid Ratio 1:1 1:2 1:3 1:4 1:5 Removal rate (%) 30 41 61 74 72

[0019] The results show that the removal rate of heavy metal Cu can reach 74% by using BHMTPMPA to remediate artificial copper-contaminated soil by soil column leaching.

Embodiment 3

[0021] 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 1500 mg·kg -1 The artificially polluted soil was put into the column, and the BHMTPMPA solution with a soil-liquid ratio of 1:4 and a concentration of 14 mol / L was added to the upper end of the column at one time. After the leaching was completed, the content of heavy metal copper in the eluent was measured, and each treatment was repeated 3 times.

[0022] Table 3 Effect of leaching time on the removal rate of heavy metal copper

[0023] Rinse time (min) 30 60 120 180 210 Removal rate (%) 35 42 55 76 71

[0024] The results showed that the soil column leaching method was used to remediate the artificial co...

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Abstract

The invention discloses a chemical leaching restoration method for copper-contaminated soil. The method is high in biodegradability and leaching efficiency. The method comprises the following steps of punching small holes in the bottom of a PVC (polyvinyl chloride) leaching column with an internal diameter of 5cm and a height of 15cm, fixing filter paper at the bottom of the leaching column, accurately weighing 100.00 grams of contaminated soil into the column, adding a 1 to 22mol / L BHMTPMPA [bis(hexamethylene triamine penta (methylene phosphonic acid))] solution to the upper end of the column in the ratio of the soil to the solution of 1:1 to 1:5 for one time, and determining the content of heavy metal copper in leachate after leaching, wherein 2 to 16 small holes are uniformly punched in the bottom of the leaching column; two layers of filter paper are fixed at the bottom of the column; the copper concentration of the contaminated soil is 800 to 2,975mg.kg<-1>. Due to the adoption of a measure for the enhanced restoration of the copper-contaminated soil with BHMTPMPA, the method has the characteristics of high restoration efficiency, high operability, low environmental risks and the like.

Description

technical field [0001] The invention relates to the technical field of leaching and restoration of copper-contaminated soil, and relates to a chemical leaching and restoration method for copper-contaminated soil. Background technique [0002] The heavy metal Cu is not only one of the essential micronutrient elements for plant growth, but also a polluting element. Cu pollution in the soil environment mainly comes from Cu-containing fertilizers, Cu-containing pesticides, livestock and poultry manure, fly ash, domestic garbage, sludge, and wastewater from copper smelters. The ecotoxicity caused by excessive accumulation of Cu in the soil environment will inhibit the photosynthesis of plants, lead to crop yield reduction, and also pose a threat to the safety of the ecosystem and human health. A large amount of copper-contaminated soil needs to be repaired urgently. [0003] In European and American countries, chemical leaching technology has been used to treat heavy metal-conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 崔爽孙秀菊赵杉林李萍刘艺芸
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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