Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ferrate oxidation co-precipitation-based arsenic-contaminated soil remediation method

A remediation method and ferrate technology, applied in the field of remediation of arsenic-contaminated soil, can solve the problems of irritating gas, pollution, poor oxidation effect, etc., and achieve the effects of improving stability, reducing cost and excellent effect.

Inactive Publication Date: 2016-10-12
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
View PDF10 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has poor oxidation effect, which may produce irritating gas or bring new pollution risks

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

[0033] (1) In a certain soil, the total amount of arsenic is 145mg / Kg. According to the "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJT 299-2007), the arsenic concentration in the leach solution is 14.37mg / L, which is higher than the "Hazardous Waste Identification Standard for Leach Toxicity" The content of 5mg / L stipulated in "Identification"; this soil is then in accordance with "Solid Waste Leaching Toxicity Leaching Method Horizontal Oscillation Method" (HJ557-2010), the concentration of arsenic in the leach solution is 7.21mg / L;

[0034] Add A agent in this soil (by the NaOH of 99.97%wt and the NaOH of 0.03%wt 2 FeO 4 After mixing, prepare an aqueous solution according to the mass ratio of the mixture to water at 1:2), add according to the amount of 2.2%wt of the relative dry base soil weight, and the pH of the soil after adding is 10; then add agent B (ferrous sulfate 90wt%, zero Valence iron 10%wt) is added according to the amount...

Embodiment 2

[0036] In a certain soil, the total amount of arsenic is 39mg / Kg. According to the "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJT299-2007), the arsenic concentration in the leach solution is 2.48mg / L, which is higher than the limit stipulated in the "Hazardous Waste Identification Standard Leaching Toxicity Identification" The content of the soil is 5mg / L; the soil is then followed by the "Horizontal Oscillation Method for Leaching Toxicity of Solid Waste" (HJ 557-2010), and the concentration of arsenic in the leach solution is 1.22mg / L;

[0037] Add A agent (by the KOH of 99.95%wt and the K of 0.05%wt in this soil) 2 FeO 4After mixing, prepare an aqueous solution according to the mass ratio of the mixture to water at 1:2), add according to the amount of 1.2%wt of the relative dry base soil weight, and the pH of the soil after adding is 9; add B agent (ferrous sulfate 80wt%, chlorine Ferrous Fe 10%, zero-valent iron 10%wt), add according...

Embodiment 3

[0039] In a soil with high arsenic content, the total amount of arsenic is 2567mg / Kg. According to the "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJT 299-2007), the arsenic concentration in the leach solution is 323mg / L, which is judged as hazardous waste;

[0040] This soil adds agent A (by the KOH of 90%wt, the NaOH of 9%, the NaOH of 0.5%wt 2 FeO 4 and 0.5% wt of K 2 FeO 4 After mixing, prepare an aqueous solution according to the mass ratio of the mixture to water at 1:2), add according to the amount of 3%wt of the relative dry soil weight, and the pH of the soil after adding is 11; add B agent (ferrous sulfate 70wt%, chlorine Ferrous chloride 20%, ferrous chloride 10%), add according to the amount of relative dry base soil weight 3%,, after adding, soil pH is 5; Then add C agent (Al 2 o 3 5% wt, Na 2 SiO 3 3%wt, MgO 30%wt, fly ash 62%wt): add according to the amount of 8%wt of relative dry soil weight, after adding, the soil pH ...

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 ferrate oxidation co-precipitation-based arsenic-contaminated soil remediation method, which comprises the following steps: adding agent A, i.e. ferrate, into arsenic-containing soil to regulate the pH of the soil to be 8 to 12, and performing reaction; then adding agent B, i.e. one or more of bivalent and trivalent iron salts or zero-valent iron, to regulate the pH of the soil to be 3 to 5, and performing reaction; further adding agent C, i.e. a precipitant, to regulate the pH of the soil to be 6 to 9, and performing reaction. The method is efficient, environmentally-friendly and low in cost and energy consumption, and has good stabilization effects.

Description

technical field [0001] The invention belongs to the field of arsenic-contaminated soil treatment, and in particular relates to a method for repairing arsenic-contaminated soil based on ferrate oxidation co-precipitation. Background technique [0002] With the rapid development of the national economy, all walks of life, especially the waste water discharge and waste residue stacking of mining and smelting industries, the sites left after the relocation of enterprises, and the large-scale fertilization and use of pesticides in agriculture have caused the site and some farmland The increase of arsenic content in the soil creates a potential risk of arsenic migrating to the ecological environment. Therefore, the treatment of arsenic-contaminated soil has received more and more attention. [0003] Arsenic can form many inorganic and organic forms in soil. Studies have shown that arsenic hydrogen is the most toxic, inorganic arsenic is more toxic than organic arsenic, trivalent ...

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
CPCB09C1/08
Inventor 罗文连蒋燚贺治国史卫华
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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