Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Remediation method of stabilization/solidification of lead-polluted soil

A lead-contaminated soil and repair method technology, applied in the field of lead-contaminated soil stabilization/solidification repair, can solve secondary pollution and other problems, achieve the effect of reduced leaching rate, long-lasting stability, and cheap repair agents

Active Publication Date: 2020-03-10
BEIJING GEOENVIRON ENG & TECH
View PDF3 Cites 15 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a remediation method of stabilization / solidification of lead-polluted soil. According to the method, a FeSO4 solution is added to the heavy metal lead-polluted soil, so that H+is generated through oxidization of the Fe2+, thus reducing pH value of soil, and promoting the conversion of instable lead in the soil into an effective state; then biochar and phosphate are added to the heavy metal lead-polluted soil, so that through adsorption, complexness, kation exchange, precipitation and the like between the biochar and phosphate and lead ions, the lead of effective stateis further converted into a lead compound in a stable residue state, thereby reducing the bio-availability of the heavy metal, reducing the content of the heavy metal in effective state in soil, and achieving adsorption and stabilization treatment of lead. The remediation method can reduce the leaching concentration of a leachate from the lead-polluted soil to lower than type III water quality standard (0.01 mg / L) according to the Quality Standard for Ground Water GBT 14848-2017.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com