Method for remediating heavy metal contaminated soil in situ

A technology of polluted soil and in-situ remediation, applied in the field of land engineering, to achieve the effect of simple and easy process, remarkable stabilization effect and low cost

Active Publication Date: 2015-02-11
ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
View PDF5 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for in-situ remediation of heavy metal-contaminated soil in view of the deficiencies in existin

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 remediating heavy metal contaminated soil in situ
  • Method for remediating heavy metal contaminated soil in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Method for in situ remediation of heavy metal polluted soil

[0026] In December 2013, a test was carried out on farmland polluted by heavy metals from the lead-zinc mine in Xiasi Village, Xinpo Town, Longhua District, Haikou City, Hainan Province. The soil pollution status of the restored farmland in this test is shown in Table 1. Comparing with the soil environmental quality standard GB15618-1995, the test soil A area in this test is the second-class soil; B area and C area are the third-class soil.

[0027] Table 1 Types of soils for testing

[0028] Test plot number

Test soil pollution type and degree

Cd

Pb

pH value

Area A

Natural farmland soil (no pollution)

0.45

38.76

5.8

Area B

Low concentration (Cd, Pb polluted farmland)

2.59

206.42

6.1

Area C

High concentration (Cd, Pb polluted farmland)

19.61

804.69

6.0

[0029] The method provided in this embodiment...

Embodiment 2

[0036] Example 2 Method for in-situ remediation of heavy metal-contaminated soil

[0037] In this experiment, the heavy metal low-concentration soil B was applied, and the amount of stabilizer used was 1.5%. Setting A was natural pollution-free farmland soil treatment, B0 was low-concentration polluted soil (without adding stabilizer), and B1 was low-concentration polluted soil (applied 1.5% stabilizer, rotary tillage 2 times) treatment, B2 low-concentration contaminated soil (1.5% stabilizer, 3 times rotary tillage) treatment and so on set up 4 plots in total, see Table 2 for details. At the same time, the experiment was arranged, and the water spinach was planted at the same time, and the water spinach samples were collected at the same time for vegetable sample collection, and the heavy metal detection and analysis of the fresh vegetable samples (edible parts of the water spinach) were carried out in the same batch.

[0038] Table 2 Influence of the times of rotary tillage ...

Embodiment 3

[0042] Example 3 Effect of in-situ remediation of heavy metal-contaminated soil

[0043] In this experiment, the heavy metal low-concentration soil C area was applied, and the amount of stabilizer used was 2.5%. Setting A was natural pollution-free farmland soil treatment, C0 was high-concentration polluted soil (no stabilizer) treatment, C1 low-concentration polluted soil (applied Stabilizer 2.5%, rotary tillage 2 times) treatment, C 2 low concentration contaminated soil (stabilizer 2.5%, rotary tillage 3 times) treatment etc. set up 4 plots in total, see Table 3 for details. At the same time, arrange the test, plant water spinach at the same time, collect water spinach samples for vegetable sample collection, and carry out heavy metal detection and analysis of fresh vegetable samples (edible parts of water spinach) in the same batch.

[0044] Table 3 The effect of rotary tillage times on the stabilization effect of compound polluted soil with high concentration of Pb and Cd ...

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 provides a method for remediating heavy metal contaminated soil in situ. The method comprises the steps of applying and spreading a stabilizing agent on the surface of to-be-remediated soil, and carrying out rotary tillage and mixing in a dry-wet alternating mode for at least three times so as to remediate the heavy metal contaminated soil. The method is suitable for being applied to the governance of stabilized remediation of farmland heavy metal soil. The stabilizing agent applying and spreading technology is simple and feasible, low in cost, short in stabilizing time of soil heavy metal, and obvious in stabilizing effect of soil heavy metal; soil remediated by the technology can be directly used, and the heavy metal content of vegetable crops planted in the stabilized soil meets the national standard.

Description

technical field [0001] The invention belongs to the field of land engineering, and in particular relates to a method for in-situ restoration of heavy metal polluted soil. Background technique [0002] Soil is the fertile, loose layer of land on which plants can grow. Soil not only provides mechanical support for plant growth, but also provides fertility elements such as water, fertilizer, air, and heat for plant growth and development. Its formation is an extremely long natural ecological process, so the protection of soil resources is very important. Due to the rapid growth of population and the rapid development of industry, solid wastes are continuously stacked and dumped on the soil surface, and harmful waste water is continuously infiltrated into the soil, resulting in soil pollution. It not only hinders the normal function of the soil, reduces the yield and quality of crops, but also indirectly affects human health through food, vegetables, and fruits. [0003] Heavy...

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): B09C1/08
Inventor 刘永兵李翔程言君张建中梁爽赵从举
Owner ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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