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A remediation method for stabilization/solidification of lead-contaminated soil

A technology for lead-contaminated soil and a remediation method is applied in the field of remediation of stabilization/solidification of lead-contaminated soil, which can solve problems such as secondary pollution, and achieve the effects of reducing leaching rate, cheap remediation agents, and lasting stability.

Active Publication Date: 2022-04-19
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the secondary pollution problems that the existing technology may cause secondary pollution caused by the redissolution of heavy metal lead-contaminated soil after remediation and the influence of traditional medicaments on soil salinization, etc., the present invention provides a method for converting combined heavy metal lead in soil into effective It is a low-cost and remedial method for the stabilization / solidification of lead-contaminated soil that can be transformed into a residue state, and has a regulatory effect on the soil, so as to realize the long-lasting and complete mineralization and stabilization of the heavy metal lead in the soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In a heavy metal lead polluted site in Shanghai, the average concentration of heavy metal lead pollution in the soil was 10500mg / kg. According to the speciation analysis, the effective content of heavy metal lead in the polluted soil accounted for 37.4%, and the residual content accounted for 32.8%. The contaminated soil adopts the stabilization / solidification repair process, and sprays 40% mass concentration of FeSO into the contaminated soil through the fog gun machine 4Solution, add 2% ferrous sulfate to the polluted soil, stir and throw it through an excavator, keep the water content in the soil at 40%, and then add 0.5% biochar and sodium dihydrogen phosphate to the polluted soil The mass ratio of solid powder, biochar and sodium dihydrogen phosphate is 1:4, which is turned and thrown through the ALLU sieving crusher three times, stirred once every 24 hours, and cured for 7 days. The Tessier five-step analysis method was used to measure the effective content of hea...

Embodiment 2

[0051] In a heavy metal-polluted site of a lead-zinc mine in Yunnan, the average concentration of heavy metal lead pollution in the soil is 21750mg / kg, and the content of lead in the effective state of heavy metal form analysis accounts for 47.6%, and the content of lead in the residual state accounts for 21.9%. Repair integrated equipment to add 50% mass concentration of FeSO 4 Solution, the concentration of ferrous sulfate in the soil is 3%, add 1% biochar and sodium dihydrogen phosphate solid powder, the mass ratio of biochar and sodium dihydrogen phosphate is 1:2, and maintain for 7 days. The Tessier five-step analysis method was used to measure the effective content of heavy metal lead in the soil, which accounted for 14.8%, and the residual content accounted for 72.4%. Through Toxic Leaching (TCLP) "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ T 299-2007) The experiment detected the leaching concentration of heavy metal lead in the soi...

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Abstract

The invention discloses a restoration method for stabilization / solidification of lead-contaminated soil. 2+ The oxidation reaction produces H + , reduce the pH value of the soil, and promote the transformation of the unstable form of lead in the soil to the effective state; add biochar and phosphate to the heavy metal lead-contaminated soil again, through the adsorption, complexation, cation between biochar and phosphate and lead ions Through exchange, precipitation, etc., the effective lead can further form a stable residue lead compound; thereby reducing the bioavailability of heavy metals, reducing the content of effective heavy metals in the soil, and realizing the adsorption and stabilization of lead. The remediation method of the present invention can make the leaching concentration of the leaching solution in the lead-contaminated soil all lower than the Class III water quality standard (0.01 mg / L) in the Groundwater Quality Standard (GBT14848‑2017).

Description

technical field [0001] The invention relates to the technical field of soil restoration, in particular to a restoration method for stabilization / solidification of lead-contaminated soil. Background technique [0002] With the development of my country's economy and rapid industrial development, cities continue to expand the scale of development for economic development, electroplating, chemical and mechanical processing enterprises are gradually increasing, and processing waste is increasing, containing a large amount of heavy metal lead. In the case of treatment, it is discharged into the soil, which greatly increases the content of heavy metal lead in the soil. In addition, during the development of my country's agriculture, the use of a large amount of pesticides has also increased the degree of soil pollution to a certain extent. The heavy metal lead continues to accumulate in the soil, causing great harm to the healthy growth of crops and threatening people's health. . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 徐剑锋任贝李淑彩吕正勇闵玉涛朱湖地苗竹魏丽
Owner BEIJING GEOENVIRON ENG & TECH
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