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

Method for repairing heavy metal contaminated soil

A technology for polluting soil and heavy metals, applied in the field of soil remediation, can solve problems such as secondary pollution of the environment, and achieve the effects of saving resources, increasing the content of nutrients, and being easy to operate.

Inactive Publication Date: 2019-10-01
粤风环保(广东)股份有限公司
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the remediation technology for heavy metal-contaminated soil mainly uses the metal chelating agent EDTA to wash the soil. However, the metal chelating agent is likely to cause secondary pollution to the environment, so there is still room for improvement.

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 repairing heavy metal contaminated soil
  • Method for repairing heavy metal contaminated soil
  • Method for repairing heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0054] S1. Break up a dry paddy field polluted by heavy metals, and control the particle size of the broken soil particles after the soil is broken to 3mm, and then excavate the broken soil.

[0055] S2. Add the excavated soil into the stirring tank, and add heavy metal eluent to the stirring tank until the heavy metal eluent completely soaks the soil, stir at a speed of 250r / min, and add ammonia water while stirring to adjust the pH to 5 At the same time, the suspended solids floating on the water surface are salvaged to be removed.

[0056] S3, add ammonia water while stirring to adjust the pH, so that the pH value of the mixed solution of the soil and the heavy metal eluent slowly rises to 11, and at the same time, while adjusting the pH value, the continuously produced suspended matter floating on the water surface is salvaged to be removed. When suspended solids no longer appear in th...

Embodiment 2

[0062] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0063] S1. Break up a dry paddy field polluted by heavy metals, and control the particle size of the broken soil particles after the soil is broken to 4mm, and then excavate the broken soil.

[0064] S2. Add the excavated soil into the stirring tank, and add heavy metal eluent to the stirring tank until the heavy metal eluent completely soaks the soil, stir at a speed of 250r / min, and add ammonia water while stirring to adjust the pH to 5.5 At the same time, the suspended solids floating on the water surface are salvaged to be removed.

[0065] S3, while stirring, add ammonia water to adjust the pH, so that the pH value of the mixed solution of the soil and the heavy metal eluent slowly rises to 11.5, and at the same time, while adjusting the pH value, the continuously produced suspended matter floating on the water surface is salvaged to be removed. When suspended solids no longer appear ...

Embodiment 3

[0071] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0072] S1. Break up a dry paddy field polluted by heavy metals, and control the particle size of the broken soil particles after the soil is broken to 5mm, and then excavate the broken soil.

[0073] S2. Add the excavated soil into the stirring tank, and add heavy metal eluent to the stirring tank until the heavy metal eluent completely soaks the soil, stir at a speed of 250r / min, and add ammonia water while stirring to adjust the pH to 6 At the same time, the suspended solids floating on the water surface are salvaged to be removed.

[0074] S3, add ammonia water while stirring to adjust the pH, so that the pH value of the mixed solution of the soil and the heavy metal eluent slowly rises to 12, and at the same time, while adjusting the pH value, the continuously produced suspended matter floating on the water surface is salvaged to be removed. When suspended solids no longer appear in th...

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 relates to the field of soil repairing, and provides a method for repairing heavy metal contaminated soil aiming at the problem that an existing repairing method of heavy metal contaminated soil easily causes secondary influence on the environment. According to the technical scheme, the method comprises the following steps of S1, crushing the soil; S2, adding a heavy metal eluent andammonium hydroxide for elution; S3, adjusting the pH and fishing suspended matter; S4, filtering out the metal eluent, sun-drying the soil, and then completing soil repairing, wherein the heavy metaleluent is prepared from, by mass, 50-55 parts of chitosan, 60-65 parts of water, 15-22 parts of sodium polyacrylate and 10-15 parts of aloe fiber powder. All the components of the heavy metal eluentare poisonless and harmless, the source is natural, and thus the environment is unlikely to get influenced; meanwhile, heavy metal precipitant is fished for centralized treatment, so that the situation does not easily occur that heavy metal eluted out of the soil is re-discharged to the environment and influences the environment accordingly.

Description

technical field [0001] The invention relates to the field of soil remediation, more specifically, it relates to a method for remediating soil polluted by heavy metals. Background technique [0002] Soil heavy metal pollution is soil pollution caused by excessive deposition of heavy metals in the soil. Heavy metals in polluted soil mainly include mercury, cadmium, lead, chromium and metalloid arsenic and other elements with significant biological toxicity, as well as elements with certain toxicity such as zinc, copper and nickel. Mainly from mining waste residues, pesticides, wastewater, sludge and atmospheric deposition, etc. For example, mercury mainly comes from mercury-containing wastewater, cadmium and lead pollution mainly comes from smelting emissions and vehicle exhaust deposition, and arsenic is widely used as insecticides, fungicides, Rodenticides and herbicides. Excessive heavy metals can cause plant physiological dysfunction and nutritional imbalance. Elements s...

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): B09C1/02C09K17/40
CPCB09C1/02C09K17/40
Inventor 雷隆鸿陆日明程旖旎何明生易晓媚白明超
Owner 粤风环保(广东)股份有限公司
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