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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 pollution, but the actual pollution is large-area, and the treatment cost is relatively high

Method used

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  • Stabilized lead-polluted soil restoration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation of embodiment 1 modified sepiolite

[0054] Put the sepiolite in the heating furnace and raise the temperature to 130°C. During the heating process, the temperature rises evenly, increasing 1°C to 2°C per minute, and then keeps at this temperature for 15 hours to eliminate the moisture on the surface of the sepiolite and in the pores. The sepiolite that eliminates moisture is put into the solution that pyridine 2,6-dicarboxylic acid is housed rapidly, and described pyridine 2,6-dicarboxylic acid is dissolved in water, and the concentration of solution is 30g / L, stirs and soaks for 5 days, obtains Picolinic acid-modified sepiolite.

[0055] The modified sepiolite is detected by infrared spectroscopy, and the infrared absorption spectrum is measured by a Magna560ESP Fourier transform infrared spectrometer, KBr is pressed into tablets, and the analysis range is 400-4000cm -1 .

[0056] Such as figure 1 As shown, compared with sepiolite, picolinic acid mo...

Embodiment 2

[0060] The soil that this embodiment is aimed at is a certain lead-contaminated soil, and the lead concentration in the soil is 7420mg / kg, and according to " solid waste leaching toxicity leaching method sulfuric acid nitric acid method " (HJ / T 299-2007) leaching concentration is 286mg / L, test The area is 5m×5m.

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

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

[0063] (2) Dosing of composite stabilizer: apply 4% of the composite stabilizer to the polluted soil into the lead-contaminated soil through crushing and screening, and mix the medicament and soil evenly;

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

[0065] (4) Dosing of desorbent solution: Spra...

Embodiment 3

[0069] The soil that this embodiment is aimed at is a certain lead-contaminated soil, and the lead concentration in the soil is 3750mg / kg, and according to " solid waste leaching toxicity leaching method sulfuric acid nitric acid method " (HJ / T 299-2007) leaching concentration is 134mg / L, test The area is 5m×5m.

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

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

[0072] (2) Dosing of composite stabilizer: Apply 7% of the composite stabilizer to the polluted soil into the lead-contaminated soil through crushing and screening, and mix the medicament and soil evenly;

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

[0074] (4) Dosing of desorbent solution: Spray t...

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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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