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Electrokinetic synergistic remediation method for composite polluted soil based on partitioned electric field

A collaborative repair and composite pollution technology, applied in the field of contaminated soil remediation, can solve problems such as secondary pollution, high-concentration site pollution is not applicable, and phytoremediation is slow.

Active Publication Date: 2020-10-23
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Comparing the above three remediation methods comprehensively, phytoremediation is slow and inefficient, and is not suitable for high-concentration site pollution; chemical leaching is costly, easy to cause secondary pollution, and is not suitable for in-situ remediation and low-permeability soils

Method used

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  • Electrokinetic synergistic remediation method for composite polluted soil based on partitioned electric field
  • Electrokinetic synergistic remediation method for composite polluted soil based on partitioned electric field
  • Electrokinetic synergistic remediation method for composite polluted soil based on partitioned electric field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The polluted soil repaired in this example is self-combined Cd and pyrene composite polluted soil. The clean soil was collected from the 0-20cm topsoil in Shenbei New District, Liaoning Province, and the soil was loam. The soil from which stones and plant roots have been removed is naturally air-dried, passed through a 20-mesh sieve, and artificially prepared into composite polluted soil with Cd and pyrene concentrations of about 100 mg / kg. After the contaminated soil was air-dried, the soil pH was measured to be 6.1. The pyrene-degrading bacteria stored in the laboratory were activated and prepared into a suspension and mixed with the contaminated soil, and the soil humidity was adjusted to 30% with deionized water, and loaded into a soil chamber. The specific specifications of the soil chamber are: length 32cm, width 17cm, height 10cm. Add appropriate amount of deionized water to the soil during operation to balance water loss.

[0052] The repair device adopted in...

Embodiment 2

[0060] The difference from Example 1 is that the soil used in the experiment is compound polluted soil with Cd and n-hexadecane, the concentration of Cd is 200 mg / kg, and the concentration of n-hexadecane is 500 mg / kg. The total processing time is 60 days, the running time of mode 1 is 16 days; the running time of mode 2 is 14 days. After 60 days of treatment, 84.3% of Cd in the soil was enriched in R 2 area, the total removal rate of n-hexadecane in the soil reached 57.3%.

Embodiment 3

[0062] The difference from Examples 1 and 2 is that the pollutants in the soil are various heavy metals and organic matter. The soil used in the experiment is polluted soil around the smelter. The heavy metal pollutants in the soil are mainly Pb, Cd, Zn, Ni, Cu, etc., with concentrations of 98.73mg / kg, 8.64mg / kg, 105.52mg / kg, and 35.68mg / kg respectively. , 25.84mg / kg, organic pollutants are mainly polycyclic aromatic hydrocarbons, and the total concentration of 16 kinds of EPA priority control polycyclic aromatic hydrocarbons is 563mg / kg. The total processing time is 45 days.

[0063] According to the experiment, under the same pH condition, among the five heavy metals, the migration speed of Cu in the soil is the slowest, so the R 2 The enrichment amount of Cu in the area, and thus determine the running time of mode 1, that is, the mode 1 time T 1 = 25 days. According to R 3 The amount of Cu precipitation after the soil acid-base mutation surface stabilizes in the area is...

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Abstract

The invention relates to a polluted soil restoration technology, in particular to a composite polluted soil electric synergistic restoration method based on electric field subzones. The method comprises the following steps: according to an electric migration-enrichment effect for the heavy metals and the chemical oxidation effect for organic pollutants, electrifying an electrode group at differenttimes, controlling the polarity of an electrode, and establishing electric field subzones including a heavy metal migration zone / organic pollutant biodegradation-chemical oxidation alternating zone,a heavy metal enrichment zone / organic pollutant biodegradation zone, and a heavy metal deposition zone / organic pollutant biodegradation zone. The electric field subzones are alternatively operate in different times, so that the enrichment of the heavy metals and the strong degradation of the organic pollutants can be realized in the space, and the heavy metals and organic pollutants are synergistically and simultaneously removed in the time.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted soil, in particular to an electrokinetic synergistic remediation method of heavy metal-organic compound polluted soil based on a partitioned electric field. Background technique [0002] The current soil pollution has changed from single pollution to compound pollution. Pollutants can be divided into heavy metals and organic pollutants. The physical and chemical properties and removal mechanisms of the two are quite different. Heavy metals are mainly separated from the soil through desorption and other physical methods, while organic pollutants are mainly removed from the soil through biodegradation. [0003] At present, the remediation technologies of composite polluted soil mainly include phytoremediation, chemical leaching, and electric remediation. A comprehensive comparison of the above three remediation methods shows that phytoremediation is slow and inefficient, and is no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 郭书海孙子程吴波
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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