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

Method for microorganism-chemical method combined remediation of heavy metal contaminated soil

A combined restoration and polluted soil technology, applied in the field of contaminated soil treatment, can solve the problems of short repair period and achieve the effect of reducing treatment cost, low technical requirements and low investment

Inactive Publication Date: 2018-01-23
湖南新九方科技有限公司 +1
View PDF9 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, there is still a lack of a method with a short remediation period that can treat soil contaminated by arsenic and other heavy metals at the same time.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for microorganism-chemical method combined remediation of heavy metal contaminated soil
  • Method for microorganism-chemical method combined remediation of heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for combined microbial-chemical method restoration of arsenic-containing heavy metal compound polluted soil, comprising the following steps:

[0043] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the soil with a thickness of 11 cm on the surface layer of arsenic-containing heavy metal-contaminated soil, and the addition ratio of magnetotactic bacteria is 8.0×10 per square meter of heavy metal-contaminated soil. 9 A magnetotactic bacterium was cultivated for 58 days;

[0044] 2) Carry out mulch film sticking to the ground covering the arsenic-containing heavy metal compound polluted soil in step 1), keep the heavy metal polluted soil in anoxic state, and place a magnet on the heavy metal polluted soil to form a magnetic field, the direction of the magnetic field is away from the ground and upward, and the magnetic field strength is 300 Gauss, keep for 35 days;

[0045] 3) Collect step 2) soil with a thickness of 8 cm on the surface layer of ...

Embodiment 2

[0052] A method for combined microbial-chemical method restoration of arsenic-containing heavy metal compound polluted soil, comprising the following steps:

[0053] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the soil with a thickness of 11 cm on the surface layer of arsenic-containing heavy metal-contaminated soil, and the addition ratio of magnetotactic bacteria is 2.0×10 per square meter of heavy metal-contaminated soil. 10 A magnetotactic bacterium was cultivated for 56 days;

[0054] 2) Carry out mulch film sticking to the ground covering the arsenic-containing heavy metal compound polluted soil in step 1), keep the heavy metal polluted soil in anoxic state, and place a magnet on the heavy metal polluted soil to form a magnetic field, the direction of the magnetic field is away from the ground and upward, and the magnetic field strength is 400 gauss, keep for 36 days;

[0055] 3) Collect step 2) soil with a thickness of 9 cm on the surface layer of...

Embodiment 3

[0062] A method for combined microbial-chemical method restoration of arsenic-containing heavy metal compound polluted soil, comprising the following steps:

[0063] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the soil with a thickness of 12 cm on the surface layer of arsenic-containing heavy metal-contaminated soil, and the addition ratio of magnetotactic bacteria is 3.5×10 per square meter of heavy metal-contaminated soil. 10 A magnetotactic bacterium was cultivated for 58 days;

[0064] 2) Carry out mulch film sticking to the ground covering the arsenic-containing heavy metal compound polluted soil in step 1), keep the heavy metal polluted soil in anoxic state, and place a magnet on the heavy metal polluted soil to form a magnetic field, the direction of the magnetic field is away from the ground and upward, and the magnetic field strength is 420 gauss, keep for 37 days;

[0065] 3) Collect step 2) soil with a thickness of 7 cm on the surface layer of...

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

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for microorganism-chemical method combined remediation of heavy metal contaminated soil. The method comprises the following steps: magnetotactic bacteria is inoculatedinto heavy metal contaminated surface soil for culture for 55-60 days; the soil, treated in the previous step, is covered by using a plastic film, and a magnetic field is kept for 35-40 days; shallow-layer soil, treated in the previous step, is collected and leached by using water, and an original place is filled with the soil after leaching; the steps are circularly repeated until the contents ofheavy metals besides As reach the national environmental requirement standards; and dissoluble iron salt is added in the soil remediated in the previous step, then, calcium salt is added, wherein thedissoluble iron salt comprises at least one of ferrous sulfate, iron chloride and ferrous chloride, and the adding quantity is 0.5-15 wt% of the weight of the soil. Compared with a traditional arsenic-contained heavy metal contaminated soil treatment method, the method is low in investment and technical requirement, prevents activation of other heavy metal in arsenic stabilization, and is excellent in soil remediation effect and high in practicability.

Description

technical field [0001] The invention belongs to the field of contaminated soil treatment, and in particular relates to a method for combined microbial-chemical method restoration of heavy metal-contaminated soil. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. Heavy metals refer to metals with a specific gravity equal to or greater than 5.0, mainly including elements with significant biological toxicity such as mercury, cadmium, lead, chromium, and metalloid arsenic, as well as elements with certain toxicity such as zinc, copper, and nickel. As a metalloid element, arsenic has similar properties to heavy metals. After entering the soil, arsenic also reacts with various components in the soil through different modes of action such as dissolution, co...

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
IPC IPC(8): B09C1/08B09C1/10B09C1/00
Inventor 杨添奇纪智慧成一知
Owner 湖南新九方科技有限公司
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