Mixed eluant for synchronously removing polychlorinated biphenyl and heavy metals in soil and its preparation method and use

A technology of mixing eluents and polychlorinated biphenyls, which is applied in the field of soil pollution remediation, can solve the problems of few studies and achieve the effect of improving the elution effect

Active Publication Date: 2015-11-04
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there are not many studies on the simultaneous elution of heavy metals and PCBs in complex polluted soils, and it is necessary to further develop new and efficient eluents

Method used

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  • Mixed eluant for synchronously removing polychlorinated biphenyl and heavy metals in soil and its preparation method and use
  • Mixed eluant for synchronously removing polychlorinated biphenyl and heavy metals in soil and its preparation method and use
  • Mixed eluant for synchronously removing polychlorinated biphenyl and heavy metals in soil and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take saponin and different amounts of Tween 80 and add them to the water. After fully dissolving, the saponin concentration is 5g / L, and the concentration of Tween 80 is 5g / L, 8g / L, 10g / L, 15g / L and 20g / L mixed eluent for simultaneous removal of PCBs and heavy metals in soil.

[0040] The application of the mixed eluent of this embodiment in the repair of polychlorinated biphenyls and heavy metal contaminated soil, the specific process is as follows:

[0041] Weigh 1g of PCB and heavy metal contaminated soil (the concentration of PCB is 11.79mg / kg, the concentration of copper is 5021.63mg / kg, the concentration of lead is 2092.39mg / kg, and the concentration of cadmium is 52.86mg / kg. kg) into a 30mL glass centrifuge tube, respectively add 20mL of the above mixed eluent, adjust the pH to 5, cover tightly with a PTFE gasket, and place it in a constant temperature shaking at a temperature of 25°C (±2°C) After shaking at 150r / min for 24 hours in the incubator, centrifuge for 20mi...

Embodiment 2

[0045] Take saponin and different amounts of Tween 80 and add them to the water. After fully dissolving, the saponin concentration is 10g / L, and the concentration of Tween 80 is 5g / L, 8g / L, 10g / L, 15g / L and 20g / L mixed eluent for simultaneous removal of PCBs and heavy metals in soil.

[0046] The application of the mixed eluent of this embodiment in the restoration of polychlorinated biphenyls and heavy metals contaminated soil, the specific application process is the same as that of embodiment 1.

[0047] Determine the concentration of PCBs and heavy metals in the supernatant, calculate the elution rate, and compare it with the elution rate and the theoretical value of the saponin solution alone as the eluent. The results are as follows figure 2 As shown (the dotted line in the figure represents the theoretical value of the elution rate).

Embodiment 3

[0049] Take saponin and different amounts of Tween 80 and add them to the water. After fully dissolving, the saponin concentration is 12g / L, and the concentration of Tween 80 is 5g / L, 8g / L, 10g / L, 15g / L and 20g / L mixed eluent for simultaneous removal of PCBs and heavy metals in soil.

[0050] The application of the mixed eluent of this embodiment in the restoration of polychlorinated biphenyls and heavy metals contaminated soil, the specific application process is the same as that of embodiment 1.

[0051] Determine the concentration of PCBs and heavy metals in the supernatant, calculate the elution rate, and compare it with the elution rate and the theoretical value of the saponin solution alone as the eluent. The results are as follows image 3 As shown (the dotted line in the figure represents the theoretical value of the elution rate).

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Abstract

The invention belongs to the technical field of polluted soil restoration and discloses a mixed eluant for synchronously removing polychlorinated biphenyl and heavy metals in soil and its preparation method and use. The mixed eluant is prepared by dissolution of active ingredients of saponin and Tween 80 in water. The mixed eluant is used for restoration of soil polluted by polychlorinated biphenyl and heavy metals. In use, the soil polluted by polychlorinated biphenyl and heavy metals is taken, and the polluted soil is mixed with the eluant and is eluted so that restoration of soil polluted by polychlorinated biphenyl and heavy metals is realized. The mixed eluant has a wide raw material source, has a low price, is environmentally friendly, has good elution effects and high elution efficiency and has a multi-ingredient polluted soil elution rate of 80% or more.

Description

Technical field [0001] The invention belongs to the technical field of soil pollution remediation, and specifically relates to a mixed eluent for synchronously removing PCBs and heavy metals in soil, and its preparation and application. Background technique [0002] Today's world has entered an era of informatization and intelligence. Electronic products and equipment are renewed and updated, causing more and more old electronic products and equipment to be discarded and eliminated, thus forming a huge amount of electronic waste. E-waste contains various circuit boards, electronic originals, plastic casings, etc., and electronic devices contain a variety of precious metal components, so there are many types of pollutants in e-waste. In the process of dismantling and incineration of e-waste, heavy metals such as copper, lead, and cadmium and persistent organic matter such as polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in e-waste enter the environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/14C11D10/02C11D1/835B09C1/02B09C1/08
CPCC09K17/14
Inventor 卢桂宁廖侃孙国胜党志郭楚玲易筱筠王霁欣林青陈晨咏
Owner SOUTH CHINA UNIV OF TECH
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