Transformable array electrode type remediation device for heavy metal polluted soil

An array type, heavy metal technology, applied in the field of environmental technology soil pollution remediation, can solve the problems of large remediation range, long remediation gap, few variable factors, etc., achieve low cation exchange capacity, expand remediation range, and test repeatability. Effect

Active Publication Date: 2018-07-27
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The repair effect of ordinary plate-shaped and single-pair electrodes is not ideal, considering that there are few variable factors and the distance from actual engineering repair is far away (plate-shaped electrodes are inconvenient to install, the repair range in engineering is large, and the actual electrode spacing of plate-shaped elec

Method used

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  • Transformable array electrode type remediation device for heavy metal polluted soil
  • Transformable array electrode type remediation device for heavy metal polluted soil

Examples

Experimental program
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Effect test

Example Embodiment

[0032] Example 1

[0033] The test period is closely related to factors such as heavy metal pollution concentration, voltage gradient, moisture content, etc. First, do a general test to estimate the test period; the Cd pollution concentration is 300mg / kg, the control voltage gradient is 1.5v / cm, and the moisture content is 30% , PRB medium material adopts zeolite (particle size 1-2mm): zero valent iron = 1; 1, the test is repaired to the 5th day in the middle of the two electrodes, the Cd removal rate is calculated to be 88.2%, and the Cd removal rate is extended from the 5th day to the 8th day The removal rate increased to 92.4% in the first day, and the removal rate was extended to 94.1% on the 10th day. The removal rate has reached a high level on the 5th day, and the increase of the removal rate is not obvious with the extension of time, and the remaining Cd may be in a residue state that is not easy to remove. Considering the repair time and removal rate comprehensively,...

Example Embodiment

[0035] Example 2

[0036] The soil weight at the filling height (10-15cm) is estimated according to the bulk density of kaolin and the volume of the soil chamber. Take the inner ring as an example, the bulk density of kaolin is 1.24g / cm 3 , the expected filling is about 15cm, the kaolin required for calculation is about 7.5kg, the expected amount of Cd in the soil is 300mg / kg, and the Cd (NO 3 ).4H 2 O 6.1775g was dissolved in deionized water, and added to the soil to be tested after dissolving. The total amount of deionized water added during the process was 2.25L (to keep the soil moisture content at 30%), fully stirred and mixed evenly and retained the sample. Electrolyte solution: 0.1mol / LNaNO3; citric acid-sodium citrate buffer solution (pH=5), 0.1mol / L citric acid can also be used as the electrolyte solution, the voltage gradient is 1.5v / cm, and the PRB material is a mass ratio zeolite ( 1-2mm): Fe 0 =1:1. Five sampling points were set between the two electrodes, and...

Example Embodiment

[0039] Example 3

[0040] The kaolin clay used in the test is 7.5kg, the expected dose of Cd in the soil is 300mg / kg, and the dose of Cu is 500mg / kg. 3 ) 2 .4H 2 O 6.1775g, Cu(NO3) 2 .3H 2 O 14.1796g, the total amount of deionized water added in the process is 2.25L (to keep the soil moisture content at 30%), fully stir and mix evenly and reserve the sample. Electrolyte solution: 0.1mol / LNaNO3; citric acid-sodium citrate buffer solution (pH=5), 0.1mol / L citric acid can also be used as the electrolyte solution, the voltage gradient is 1.5v / cm, and the PRB material is a mass ratio zeolite ( 1-2mm): Fe 0 = 1:1, start timing after 24 hours of equilibration, sample and record every 24 hours, and finally measure and analyze to calculate the removal rate of each point.

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Abstract

The invention relates to a transformable array electrode type remediation device for heavy metal polluted soil. The device is characterized in that a soil chamber is arranged around a central electrode chamber, and the soil chamber and the central electrode chamber form concentric circles; a PRB (Permeable reactive barrier) is arranged in the concentric circles in the direction vertical to the electric field direction, and the central electrode chamber and the PRB form concentric circles; the space between the central electrode chamber and a PRB body is filled with a medium filler; six hollowvertical column type anode chambers are uniformly distributed on a circular arc of the soil chamber and are treated as surrounding electrode chambers; filtering nets are attached to the soil chamber,the anode chambers, the PRB, and the inner walls, adjacent to cathode chambers, of the PRB; electrodes are arranged in the anode chambers and the cathode chambers. According to the device, the array electrode arrangement mode is adopted, so that the remediation efficiency is improved; the remediation period is reduced; the size of the electrode chamber is adjustable; the electrodes can move, thusthe device can be switched among different remediation ranges, and as a result, the practicability is high; the electric remediation mode and the PRB are combined, so that the heavy metal in the soilcan be efficiently removed.

Description

technical field [0001] The invention relates to soil pollution restoration of environmental technology, in particular to an EK-PRB restoration device for soil heavy metal pollution. Background technique [0002] Contaminated soil remediation has been paid more and more attention at home and abroad. In foreign countries, some technologies have entered the stage of engineering demonstration and application. At present, the main methods for dealing with heavy metal-contaminated soils include guest soil method, leaching method, solidification / stabilization method, phytoremediation method and electrodynamic remediation method. The engineering quantity of guest-soil method is large, time-consuming and labor-intensive. The leaching method and the solidification / stabilization method did not completely remove the heavy metals in the soil, which easily caused secondary pollution of the soil, and were not suitable for large-scale site restoration. Phytoremediation is generally time-c...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/085B09C2101/00
Inventor 周海东吕叔锋陈晓萌许佳慧应桢西
Owner UNIV OF SHANGHAI FOR SCI & TECH
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