Composite remediation agent for heavy metal contaminated soil and application method

A technology for composite remediation and contaminated soil, applied in the field of remediation of heavy metal-contaminated soil, can solve the problems of unsuitable resource reuse, high treatment cost, and difficulty in mud-water separation, so as to change the oxidation-reduction potential and heavy metal valence state, and promote oxidation reduction. Effect of precipitation and reduction of heavy metal toxicity

Active Publication Date: 2020-08-25
CHANGSHA SCI ENVIRONMENTAL TECH
View PDF14 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The soil improvement method consumes a lot of money, manpower and material resources. In the process of soil replacement, there are defects such as land occupation, leakage, and environmental pollution; the electric restoration technology is economical and reasonable, but it is easy to cause secondary soil pollution and has high permeability and poor conductivity. The effect of the sandy soil is poor; the separation of mud and water after the soil leaching method is difficult, the sewage treatment is more difficult, the soil structure will be destroyed, and it is not suitable for resource reuse; the bioremediation technology has a long repair period, and the growth rate of hyperaccumulator plants is generally high. Slow, the microbial biomass is small, and subsequent trea...

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
  • Composite remediation agent for heavy metal contaminated soil and application method
  • Composite remediation agent for heavy metal contaminated soil and application method
  • Composite remediation agent for heavy metal contaminated soil and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The composition of the soil composite restoration agent is as follows in parts by mass: 30 parts of ferrous sulfate; 5 parts of calcium sulfide; 40 parts of lime; 19 parts of dolomite, 3 parts of black humic acid and 3 parts of fulvic acid.

[0038] Dry the iron-based agents, sulfur-based agents and calcium-based agents separately, grind them through a 150-mesh sieve, activate them at 105°C for 1.5 hours, mix them, add organic matter, and mix them evenly to obtain a composite repair agent .

Embodiment 2

[0040] The composition of the soil composite restoration agent is as follows in parts by mass: 25 parts of polyferric sulfate; 4 parts of sodium polysulfide; 4 parts of sodium sulfide; 20 parts of calcium carbonate; 28 parts of Portland cement; acid 3 parts.

[0041] Dry the iron-based agents, sulfur-based agents and calcium-based agents separately, grind them through a 150-mesh sieve, activate them at 105°C for 1.5 hours, mix them, add organic matter, and mix them evenly to obtain a composite repair agent .

Embodiment 3

[0043] The composition of the soil composite restoration agent is calculated in parts by mass: 30 parts of ferric oxide; 8 parts of ferrous sulfide; 2 parts of calcium sulfide; 25 parts of calcium hydroxide; 30 parts of lime; 2.5 servings.

[0044]Dry the iron-based agents, sulfur-based agents, and calcium-based agents, grind them through a 100-mesh sieve, activate them at 150°C for 2 hours, mix them, add organic matter, and mix them evenly to obtain a composite restoration agent.

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 composite remediation agent for heavy metal contaminated soil and an application method, and belongs to the field of remediation of heavy metal contaminated soil. The composite remediation agent is prepared from, by mass, 25-40 parts of an iron-based agent, 5-15 parts of a sulfur-based agent, 40-60 parts of a calcium-based agent and 5-10 parts of organic matters, whereinthe organic matters are fulvic acid and at least one of ulmic acid and humic acid. The agent provided by the invention can adjust the dosage and component proportion of each agent according to the content of heavy metals in soil, and is widely applied to different types of polluted soil. The composite remediation agent has a good remediation effect on cadmium, lead, zinc, arsenic and other heavy metal composite contaminated soil, and has the advantages of long-term stability, short remediation time, flexible agent proportioning, low consumption and treatment cost saving.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated soil, and in particular relates to a compound remediation agent for heavy metal-contaminated soil and an application method. Background technique [0002] Soil pollution can be divided into heavy metal pollution, pesticide pollution and organic pollution and other types. According to relevant data, the most serious pollution in China is heavy metal pollution. The main pollutants are cadmium, arsenic, chromium, lead, etc. More than half of this kind of pollution is caused by the discharge of industrial "three wastes". [0003] At present, the commonly used remediation technologies for heavy metal-contaminated soil include soil improvement method, electrodynamic remediation technology, solidification / stabilization, soil leaching method, and bioremediation technology. The soil improvement method consumes a lot of money, manpower and material resources. In the process ...

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): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 蒋国民朱艳聪高伟荣文波雷国建李栎董芬王豪
Owner CHANGSHA SCI ENVIRONMENTAL TECH
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