Stabilized lead-polluted soil restoration method

A technology of lead-contaminated soil and a remediation method is applied in the field of heavy metal-contaminated soil remediation, which can solve the problems of small current action distance and high treatment cost, and achieve the effects of good adsorption and improvement of stabilization effect.

Active Publication Date: 2017-10-24
爱土工程环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a small current action distance and is suitable for small-area pollut

Method used

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  • Stabilized lead-polluted soil restoration method

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0053] Example 1 Preparation of modified sepiolite

[0054] Put the sepiolite in a heating furnace and raise the temperature to 130°C. During the heating process, the temperature will increase evenly, and it will be reduced to 1°C to 2°C per minute. Then keep it at this temperature for 15 hours to eliminate the moisture on the surface of the sepiolite and the pores. The sepiolite, which eliminates moisture, is quickly put into a solution containing pyridine 2,6-dicarboxylic acid, the pyridine 2,6-dicarboxylic acid is dissolved in water, the concentration of the solution is 30g / L, and the solution is soaked with stirring for 5 days to obtain Sepiolite modified with dipicolinic acid.

[0055] The modified sepiolite was detected by infrared spectroscopy. The infrared absorption spectra were measured by Magna560ESP Fourier Transform Infrared Spectrometer, KBr tablet, analysis range 400~4000cm -1 .

[0056] Such as figure 1 As shown, compared with sepiolite, the sepiolite modified by di...

Example Embodiment

[0059] Example 2

[0060] The soil targeted by this example is a lead-contaminated soil. The lead concentration in the soil is 7420 mg / kg. According to the "Solid Waste Leaching Toxicity Leaching Method: Sulfuric Acid Nitric Acid Method" (HJ / T 299-2007), the leaching concentration is 286 mg / L. The area is 5m×5m.

[0061] The main steps to repair the lead-contaminated soil are as follows:

[0062] (1) Preparation of composite stabilizer: the sodium tripolyphosphate and the modified sepiolite prepared in Example 1 are thoroughly mixed at a mass ratio of 3:7 to prepare a composite stabilizer;

[0063] (2) Dosing of compound stabilizer: apply 4% compound stabilizer of contaminated soil to lead-contaminated soil that has been crushed and screened, and mix the agent and soil evenly;

[0064] (3) Preparation of analytical reagent solution: MgCl 2 ·6H 2 O is dissolved in water and prepared into a 0.3% magnesium chloride solution;

[0065] (4) Dosing of analytical agent solution: spray the chlor...

Example Embodiment

[0068] Example 3

[0069] The soil targeted by this example is a lead-contaminated soil. The lead concentration in the soil is 3750mg / kg. According to the "Solid Waste Leaching Toxicity Leaching Method: Sulfuric Acid Nitric Acid Method" (HJ / T 299-2007), the leaching concentration is 134mg / L. The area is 5m×5m.

[0070] The main steps to repair the lead-contaminated soil are as follows:

[0071] (1) Preparation of composite stabilizer: the sodium tripolyphosphate and the modified sepiolite prepared in Example 1 are thoroughly mixed at a mass ratio of 1:9 to prepare a composite stabilizer;

[0072] (2) Dosing of compound stabilizer: 7% of the compound stabilizer of the contaminated soil is applied to the lead-contaminated soil after crushing and screening, and the agent and the soil are mixed evenly;

[0073] (3) Preparation of analytical reagent solution: CaCl 2 ·2H 2 O is dissolved in water and prepared into a 0.1% calcium chloride solution;

[0074] (4) Dosing of analytical agent solut...

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Abstract

The invention discloses a stabilized lead-polluted soil restoration method and belongs to the field of heavy metal polluted soil restoration. Soluble tripolyphosphate and pyridinedicarboxylic acid modified sepiolite are mixed to prepare a compound stabilizer, the compound stabilizer is added in lead-polluted soil, even mixing is performed, a chlorine salt analysis agent solution is sprayed onto the polluted soil, then anaerobic curing is performed, and the polluted soil can meet the risk control requirement after stabilization. The lead contained in the soil can be firmly fixed in the soil through analysis, activation, precipitation, adsorption and other principles, and the migration capability and bioavailability of the lead are reduced.

Description

technical field [0001] The invention relates to the field of remediation of heavy metal-contaminated soil, in particular to a method for stabilizing and remediating lead-contaminated soil. Background technique [0002] Lead pollution in the environment mainly comes from enterprises that smelt, manufacture and use lead products, followed by lead-containing tail gas emitted by automobiles. Lead is an environmental pollutant with a wide distribution of heavy metal soil pollution and strong accumulation. The main ways for lead to enter the soil environment are dry and wet deposition of atmospheric lead pollutants, lead-containing wastewater and sewage irrigation, direct pollution of lead-containing solid waste, and the use of pesticides and fertilizers. Lead is an accumulative toxic substance that can accumulate continuously in the human body. Lead in the soil can enter the human body through skin contact or oral route, thereby affecting human health and seriously damaging the ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 吴启模周愈尧段建宏肖伟方灿华李卫雄陈超
Owner 爱土工程环境科技有限公司
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