Restoration agent S-PbCd for restoring soil subjected to heavy metal Pb-Cd combined pollution, and preparation method and application method thereof

A technology of composite pollution and remediation agent, applied in the field of soil remediation, can solve the problems of reducing the effective Pb-Cd content and low Pb-Cd immobilization rate, so as to overcome the poor remediation effect, prevent the loss of soil nutrients, and reduce adsorption. effect of ability

Active Publication Date: 2015-09-09
INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problem of low fixation rate of Pb-Cd in the prior art, and reduce the effective Pb-Cd content in the soil

Method used

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  • Restoration agent S-PbCd for restoring soil subjected to heavy metal Pb-Cd combined pollution, and preparation method and application method thereof
  • Restoration agent S-PbCd for restoring soil subjected to heavy metal Pb-Cd combined pollution, and preparation method and application method thereof
  • Restoration agent S-PbCd for restoring soil subjected to heavy metal Pb-Cd combined pollution, and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: the preparation method of the remediation agent S-PbCd of remediation by heavy metal Pb-Cd compound polluted soil

[0049] The various components in the restoration agent S-PbCd and their respective mass-number ratios are: about 20 parts of modified carbon nanotubes: about 30 parts of modified clay minerals: about 50 parts of quicklime.

[0050] The preparation method of the modified carbon nanotube is as follows:

[0051] Carbon nanotubes are tubes of nano-sized carbon. Purchased from Beijing Deke Daojin Technology Co., Ltd., product model CNT100, specific surface area > 450 m2 / g.

[0052] (1) Mix carbon nanotubes, 65% concentrated nitric acid and 0.5 mol / L potassium permanganate at a ratio of 1:2:5 in parts by mass, let stand and cool;

[0053] (2) After oxidizing the material cooled in step (1) at 90°C for 2-4 h, centrifugally filter and cool;

[0054] (3) Wash and centrifuge the filtered cooling material in step (2) repeatedly with deionized water u...

Embodiment 2

[0062] Example 2: Restoration agent S-PbCd is used to repair Pb-Cd composite polluted inferior Class III soil

[0063] The remediation agent S-PbCd prepared in Example 1 was used to remediate Pb and Cd compound heavy metal-contaminated soil caused by sewage irrigation in Tianjin. The pH of the soil is 7.1, which is slightly alkaline. The average value of Pb content is 526 mg / kg, and the average value of Cd content is 1.2 mg / kg. The study area is inferior to the third category soil with Cd-Pb compound pollution. Application flow chart such as figure 2 shown.

[0064] The specific application method is as follows:

[0065] (1) Pretreatment: Excavate the contaminated soil with an excavator, dig out the contaminated soil in the 0-20 cm plow layer, remove large-scale branches, gravel and other debris in the soil, and crush large-volume soil clumps, Until the soil particle diameter is less than 1 cm;

[0066] (2) Restoration agent ingredients: according to soil bulk density, c...

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Abstract

The invention discloses a restoration agent S-PbCd for restoring soil subjected to heavy metal Pb-Cd combined pollution, and a preparation method and application method thereof. The restoration agent is mainly composed of the following components in parts by mass: 5-20 parts of modified carbon nanotube, 10-60 parts of modified clay mineral and 10-75 parts of quicklime. The modified clay mineral is a modified zeolite-modified vermiculite mixture. After ripening for 1 month, the restoration agent S-PbCd can lower the mobile Pb and Cd contents in soil by more than 80%, and lower the Pb and Cd contents in sensitive crops by 75-90%. The restoration agent has the advantages of low cost, simple preparation and restoration technique, no secondary pollution and quick effect taking, and can be widely used for restoring large-area Pb / Cd polluted soil, such as mine soil, agricultural land and the like.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a remediation agent for remediating soil contaminated by heavy metal Pb-Cd composites, a preparation method and a use method thereof. Background technique [0002] Both metals Pb and Cd are highly toxic environmental pollutants, and also have the characteristics of non-degradability and bioaccumulation, which are difficult to remove by conventional methods. Both metal Pb and Cd are harmful to human health, and metal Pb mainly harms the nervous system of the human body; while metal Cd mainly harms the endocrine system such as the skeletal system and kidneys of the human body. [0003] At present, the remediation methods of heavy metals Pb and Cd contaminated soil mainly include chemical methods (leaching method, application of remediation agent, etc.), physical methods (foreign soil method, electrical treatment, etc.) and biological methods (phytoremediation, etc.). Amon...

Claims

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Application Information

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IPC IPC(8): C09K17/08B09C1/00B09C1/08C09K101/00C09K109/00
CPCB09C1/00B09C1/08C09K17/08C09K2101/00C09K2109/00
Inventor 王蕊陈明张佳文李小赛王新宇
Owner INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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