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Compound eluting agent and method for eluting heavy metals in soil by virtue of compound eluting agent

A compound eluent and eluent technology, applied in the restoration of contaminated soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of secondary pollution, eluent pollution, etc., and achieve short time and environmental protection Friendly, rinse-enhancing effect

Inactive Publication Date: 2019-01-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also environmental problems such as the pollution of the eluent itself. Some people use tea saponin and EDTA for combined elutriation, and the removal effect on heavy metals is better than that of a single eluent, but EDTA causes secondary pollution.

Method used

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  • Compound eluting agent and method for eluting heavy metals in soil by virtue of compound eluting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare eluent: dissolve oxalic acid and tea saponin in water, adjust the pH to 6 with sodium hydroxide, wherein the concentration of oxalic acid is 0.1 mol / L, and the mass concentration of tea saponin is 2%.

[0027] Rinse: Carry out experiments at room temperature, with the optimum water-to-soil ratio of 20:1, weigh 1g of 1# soil sample passed through a 100-mesh sieve into a 50ml centrifuge tube, add 20ml of the above-mentioned eluent into the centrifuge tube, at 25 Centrifuge at 150r / min for 2 hours at 150r / min, put the centrifuge tube into a centrifuge, centrifuge at 4000r / min for 15min, pass through a 0.45μm filter, put the filtrate into a 15ml centrifuge tube, and use inductive coupling The content of As and Cd was measured by plasma mass spectrometry (ICP-MS).

[0028] The results show that the removal rate of As in 1# soil sample by the eluent of this example is 90%, and the removal rate of Cd is 45%.

Embodiment 2

[0030] Prepare eluent: dissolve oxalic acid and tea saponin in water, adjust the pH to 6 with sodium hydroxide, wherein the concentration of oxalic acid is 0.1 mol / L, and the mass concentration of tea saponin is 2%.

[0031] Rinse: Carry out experiments at room temperature, with the optimum water-to-soil ratio of 20:1, weigh 1g of 1# soil sample passed through a 100-mesh sieve into a 50ml centrifuge tube, add 20ml of the above-mentioned eluent into the centrifuge tube, at 25 At ℃, shake at 150r / min for 0.5h. After shaking, put the centrifuge tube into the centrifuge, centrifuge at 4000r / min for 15min, pass through a 0.45μm filter membrane, and put the filtrate into a 15ml centrifuge tube. The content of As and Cd was measured by coupled plasma mass spectrometry (ICP-MS).

[0032] The results show that the removal rate of As in 1# soil sample by the eluent of this example is 75%, and the removal rate of Cd is 31%.

Embodiment 3

[0034] Prepare eluent: dissolve oxalic acid and tea saponin in water, adjust the pH to 6 with sodium hydroxide, wherein the concentration of oxalic acid is 0.1 mol / L, and the mass concentration of tea saponin is 2%.

[0035] Rinse: Carry out experiments at room temperature, with the optimum water-to-soil ratio of 20:1, weigh 1g of 1# soil sample passed through a 100-mesh sieve into a 50ml centrifuge tube, add 20ml of the above-mentioned eluent into the centrifuge tube, at 25 Centrifuge at 150r / min for 1 hour at 150r / min, put the centrifuge tube into a centrifuge, centrifuge at 4000r / min for 15min, pass through a 0.45μm filter, put the filtrate into a 15ml centrifuge tube, and use inductive coupling The content of As and Cd was measured by plasma mass spectrometry (ICP-MS).

[0036] The results show that the removal rate of As in the 1# soil sample by the eluent of this example is 79%, and the removal rate of Cd is 37%.

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Abstract

The invention provides a compound eluting agent and a method for eluting heavy metals in soil by virtue of the compound eluting agent. The compound eluting agent has a good eluting effect, is environment-friendly and has no secondary pollution. The compound eluting agent is prepared by dissolving oxalic acid and tea saponin into water, wherein the molar concentration of oxalic acid is 0.05mol / L-0.2mol / , and the mass concentration of tea saponin is 2%-5%. The method comprises the steps of mixing a soil sample with the compound eluting agent, vibrating at a vibration speed of 80r / min-180r / min for 0.5-24 hours, carrying out centrifugation, and filtering, so as to obtain the eluted soil.

Description

technical field [0001] The invention belongs to the field of ecological environment restoration, and relates to a composite leaching agent and a method for leaching soil heavy metals. Background technique [0002] Soil pollution is cumulative, and pollutants are not easy to migrate, diffuse and dilute in the soil, so they are easy to accumulate in the soil and exceed the standard. At the same time, soil pollution is very stable. Leaching remediation is to transfer the heavy metals in the soil from the solid phase to the liquid phase, which can completely remove As and Cd in the polluted soil. Because of its short cycle and high remediation efficiency, it has received extensive attention and research. Soil washing remediation has incomparable advantages over other remediation methods due to factors such as short time, quick effect, and no limitation of pollution degree. However, there are also environmental problems such as the pollution of the eluent itself. Some people use...

Claims

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Application Information

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IPC IPC(8): C09K17/14B09C1/02
CPCB09C1/02C09K17/14
Inventor 郭军康李艳萍徐慧荟任心豪花莉贾红磊魏婷范春辉
Owner SHAANXI UNIV OF SCI & TECH
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