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

Electric complex-strengthening repairing method and device of heavy metal-organic co-contaminated soil

A technology of compound pollution and remediation method, which is applied in the field of remediation of heavy metal-organic compound polluted soil, to achieve the effect of reducing subsequent treatment, increasing migration and improving removal efficiency

Inactive Publication Date: 2012-06-27
INST OF SOIL SCI CHINESE ACAD OF SCI
View PDF8 Cites 53 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: In order to overcome the shortcomings of the existing remediation technology, realize the efficient removal of heavy metals and organic pollutants, and at the same time reduce the subsequent treatment of the electrolyte, the invention provides a kind of electrokinetic composite strengthening of heavy metal-organic composite polluted soil The repair method and its device ensure the rapid and effective migration of heavy metals out of the soil. At the same time, proper addition of co-solvents and oxidants in the electrolyte increases the dissolution and migration of organic pollutants, and realizes the oxidative degradation of organic matter during migration, thereby reducing subsequent treatment.

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
  • Electric complex-strengthening repairing method and device of heavy metal-organic co-contaminated soil
  • Electric complex-strengthening repairing method and device of heavy metal-organic co-contaminated soil
  • Electric complex-strengthening repairing method and device of heavy metal-organic co-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The experimental red soil was collected from the Red Soil Ecological Experiment Station of the Chinese Academy of Sciences (Yingtan, Jiangxi). The recovered red soil was air-dried and ground to a particle size of 0.84 mm. In this example, copper and pyrene are used as simulated heavy metals and organic pollutants, and copper and pyrene are artificially added to the soil to cultivate copper-pyrene composite polluted soil. The specific method is: weigh a certain amount of soil, and take one tenth of it 1. Mix the soil in a glass container. Dissolve quantitative pyrene (Sigma company, purity>98%) in acetone, add it to the soil, and stir rapidly to make the acetone completely volatilize, equilibrate in a fume hood for 1d, and then add a certain amount of CuCl 2 2H 2 O was dissolved in an appropriate amount of deionized water (about 30 mL) and added to the soil, stirred evenly, and placed in a fume hood to balance for 1 day until dry. Mix the mixed soil with the remaining...

Embodiment 2

[0029] The test red soil uses the same red soil as in Example 1, and the cultivation method of the polluted soil is also the same as in Example 1. In this example, we selected hydrogen peroxide, sodium hypochlorite, potassium permanganate and sodium persulfate as oxidizing agents, respectively selected the best oxidizing agent concentration on the basis of previous experiments, and selected HPCD as a cosolvent to increase the water solubility of pyrene . The specific test treatment is shown in Table 2, and the test-1 in Table 1 is used as a contrast, and the soil sample treatment and measurement method after the test are the same as in Example 1.

[0030] Table 2 Experimental design of electrokinetic treatment of compound polluted soil

[0031]

[0032] Table 3 shows the concentration of pollutants in the polluted soil after electric restoration. It can be seen from the table that the pollutant content of each soil section has decreased significantly. For the removal of p...

Embodiment 3

[0036] The experimental red soil was collected from the Red Soil Ecological Experiment Station of the Chinese Academy of Sciences (Yingtan, Jiangxi). The recovered red soil was air-dried and ground to a particle size of 0.84 mm. Mix the soil with a certain concentration of copper solution, then put it in a porcelain container, add water to make it in a flooded state, and cultivate it at room temperature for one month. The cultivated red soil is air-dried and sieved to a particle size of 0.25mm. spare. The copper concentration in the cultivated red soil was measured by the aqua regia-perchloric acid digestion method to be about 440mg kg -1 .

[0037] figure 1 It is a schematic diagram of the electric restoration treatment device shown. Put the cultivated red soil 1 with a particle size of 0.25 mm into the electric repair column 2, and place a piece of sintered glass 9 between the soil column and the anode electrolytic cell 3 and the cathode electrolytic cell 4 to prevent 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

PropertyMeasurementUnit
lengthaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides an electric complex-strengthening repairing method and device of heavy metal-organic co-contaminated soil. The method provided by the invention comprises the following steps of: filling contaminated soil into an electric repairing device, and then adding an oxidant into a cathode electrolyte and an anode electrolyte or directly spraying the oxidant on the contaminated soil, wherein the oxidant comprises hydrogen peroxide, pypocholoride and persulfate; applying a direct-current electric field on a cathode and an anode, wherein the strength of the electric field is 0.5-2 V / cm; and controlling the pH values of the cathode electrolyte and the anode electrolyte to be 3-11. By selecting the suitable for oxidant and controlling the pH value of the electrolyte, the migration of the heavy metal can be effectively increased and the removing efficiency is improved; and meanwhile, the oxidant is used for effectively degrading organic pollutants when the pollutants are migrated, thereby relieving the post-treatment and simultaneously removing the heavy metal and the organic pollutants.

Description

technical field [0001] The invention relates to a remediation technology for composite polluted soil, in particular to a remediation method and device for heavy metal-organic composite polluted soil. Background technique [0002] The remediation of compound polluted soil has always been one of the hotspots and difficulties in soil remediation. Compound polluted soil generally includes heavy metal compound polluted soil, organic compound polluted soil and heavy metal-organic compound polluted soil. Because there are two types of pollutants with large differences in properties, heavy metals and organic pollutants, in heavy metal-organic compound polluted soil, heavy metals have better water solubility and are easy to move in the soil, while organic pollutants generally have poor water solubility. It is easy to combine with soil organic matter and difficult to migrate in the soil, so there has been no better method for this type of contaminated soil remediation. The remediati...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 仓龙樊广萍周东美
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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