Eluting agent capable of synchronously removing polychlorinated biphenyl and heavy metal in soil, preparation method and application thereof

A technology for polychlorinated biphenyls and heavy metals, applied in the field of soil pollution remediation, can solve the problems of impact, adverse effects of pollutant elution ability, less research on leaching methods, etc., and achieve the effect of improving the elution effect

Inactive Publication Date: 2015-01-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the two leaching agents are used at the same time, the systems formed by them in the soil and the solution will affect each other, which may indirectly have an adverse effect on the elution ability of pollutants.
At present, there are few domestic studies on the leaching method for the simultaneous removal of heavy metals and PCBs.

Method used

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  • Eluting agent capable of synchronously removing polychlorinated biphenyl and heavy metal in soil, preparation method and application thereof
  • Eluting agent capable of synchronously removing polychlorinated biphenyl and heavy metal in soil, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Effect of citric acid and Tween-80 leaching sequence on remediation of PCB-heavy metal compound polluted soil

[0023] Test materials: polychlorinated biphenyls (Aroclor 1254), nonionic surfactant Tween-80 (TW-80), natural chelating agent citric acid.

[0024] The mass concentrations of Cu, Pb, Cd and PCBs in simulated contaminated soil were 5000mg / kg, 1967mg / kg, 51.0mg / kg and 11.2mg / kg respectively. The basic properties of the contaminated soil are shown in Table 1.

[0025] Table 1 Basic properties of contaminated soil

[0026]

[0027] The concentration of Aroclor1254 in the solution was determined by DSQ II single quadrupole gas chromatography-mass spectrometer, and the concentrations of Cu, Pb and Cd were determined by Z-2000 series atomic absorption spectrophotometer.

[0028] experiment method:

[0029] Experimental group (combined addition): Weigh 1g of polluted soil in a 30mL glass centrifuge tube with a polytetrafluoroethylene spacer cover, add ...

Embodiment 2

[0033] Example 2 The concentration ratio of the leaching agent of the present invention is to the elution effect of polychlorinated biphenyls in compound polluted soil

[0034] According to TW-80 concentration is 0g / L, 2g / L, 5g / L, 10g / L or 20g / L and citric acid concentration is 0g / L, 2g / L, 5g / L, 10g / L or 20g / L L, prepared into 25 kinds of rinse agents of the present invention with different concentrations.

[0035] Use prepared leaching agent of the present invention of 25 different concentrations to carry out leaching test to polychlorinated biphenyl-heavy metal compound polluted soil, the elution effect of polychlorinated biphenyl is as shown in table 2, and test result shows: when When the concentration of citric acid is 0g / L, the elution rate of PCBs is positively correlated with the concentration of TW-80. When the concentration of TW-80 is 10g / L, the elution rate of PCBs is 45.20%. The elution rate of PCBs after adding citric acid The rate increased further, and increased...

Embodiment 3

[0038] Example 3 The concentration ratio of the eluent of the present invention is to the effect of elution of heavy metals in compound polluted soil

[0039] Configure the same 25 kinds of eluents of the present invention with different concentrations as in Example 2.

[0040] Use prepared leaching agent of the present invention of 25 different concentrations to carry out leaching test to polychlorinated biphenyl-heavy metal compound polluted soil, observe the concentration of TW-80 from low to high to polychlorinated biphenyl-heavy metal compound pollution The change rule of the leaching effect of heavy metals in the soil, the elution effect of copper in the composite polluted soil is shown in Table 3, the elution effect of lead in the composite polluted soil is shown in Table 4, and the elution effect of cadmium in the composite polluted soil is shown in Table 4. As shown in Table 5, the test results show that:

[0041] When the concentration of TW-80 is 0g / L, the elution ...

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Abstract

The invention belongs to the soil pollution restoration field, and discloses an eluting agent capable of synchronously removing polychlorinated biphenyl and heavy metal in soil, a preparation method and an application thereof. The eluting agent capable of synchronously removing polychlorinated biphenyl and heavy metal in soil is prepared by mixing a citric acid solution and a tween 80 solution. The method for restoring polychlorinated biphenyl and heavy metal-polluted soil comprises the following steps: taking the polychlorinated biphenyl and heavy metal-polluted soil, adding the eluting agent capable of synchronously removing polychlorinated biphenyl and heavy metal in soil, mixing and oscillating, and leaching to complete the restoration for polychlorinated biphenyl and heavy metal-polluted soil. The eluting agent has the advantages of wide raw material source, low cost, the raw materials are biodegradable substances, and environment risk after leaching and restoring can be reduced. The soil restoration effect by employing the eluting agent capable of synchronously removing polychlorinated biphenyl and heavy metal in soil is good, and elution rate is high.

Description

technical field [0001] The invention belongs to the field of soil pollution remediation, and relates to a leaching agent for remediating soil pollution, in particular to a leaching agent for synchronously removing polychlorinated biphenyls and heavy metals in soil, its preparation method and application. Background technique [0002] With the development of the information age, more and more waste electronic and electrical equipment around the world are eliminated, forming a huge amount of electronic waste. Due to imperfect dismantling technology and equipment, heavy metals such as copper, lead, and cadmium contained in electronic waste and persistent organic pollutants such as polychlorinated biphenyls (PCBs) are easy to enter the surrounding environment, making the dismantling site and surrounding areas The region has formed the characteristics of coexistence of heavy metal and toxic organic pollution. [0003] E-waste pollution in my country has become an important envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02C09K17/14
Inventor 卢桂宁孙贝丽党志郭楚玲杨琛易筱筠
Owner SOUTH CHINA UNIV OF TECH
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