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 so

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

Example Embodiment

[0052] Example 1

[0053] A method for repairing soil contaminated by heavy metals includes the following steps:

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

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

[0056] S3. Adjust the pH by adding ammonia water while stirring, so that the pH value of the mixed solution of soil and heavy metal eluent slowly rises to 11, and at the same time, adjust the pH value while salvaging the continuously generated suspended matter floating on the water surface to remove. When suspended solids no longer appear in the mixed solution of soil a...

Example Embodiment

[0061] Example 2

[0062] A method for repairing soil contaminated by heavy metals includes the following steps:

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

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

[0065] S3. Adjust the pH by adding ammonia water while stirring, so that the pH value of the mixed solution of soil and heavy metal eluent slowly rises to 11.5. At the same time, while adjusting the pH value, the suspended solids floating on the water surface that are continuously generated are salvaged to remove. When suspended solids no longer appear in the mixed solution...

Example Embodiment

[0070] Example 3

[0071] A method for repairing soil contaminated by heavy metals includes the following steps:

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

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

[0074] S3. Adjust the pH by adding ammonia water while stirring, so that the pH value of the mixed solution of the soil and heavy metal eluent slowly rises to 12. At the same time, while adjusting the pH value, the suspended solids floating on the water surface that are continuously generated are salvaged to remove. When suspended solids no longer appear in the mixed...

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 Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap