Soil heavy metal remediation device with switchable array electrodes

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

Active Publication Date: 2020-11-24
UNIV OF SHANGHAI FOR SCI & TECH
View PDF15 Cites 0 Cited by
  • 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 electrodes is large. It is difficult to achieve the repair effect of a uniform electric field), and other problems, the present invention provides an in-situ, efficient, and more practical repair technology of combined electromotive force and osmotic reaction walls under multiple pairs of electrodes-transformable array soil heavy metal repair device

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
  • Soil heavy metal remediation device with switchable array electrodes
  • Soil heavy metal remediation device with switchable array electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

[0036] Estimate the soil weight of the filling height (10-15cm) according to the kaolin bulk density and the volume of the soil chamber. Taking the inner ring as an example, the kaolin bulk density is 1.24g / cm 3 , it is expected to fill about 15cm, and the kaolin required for calculation is about 7.5kg. The amount of Cd poisoning in the expected 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 in the process was 2.25L (to keep the moisture content of the soil at 30%), fully stirred and mixed evenly and retained a sample. Electrolyte solution: 0.1mol / LNaNO3; Citric acid-sodium citrate buffer solution (pH=5), also can use the citric acid of 0.1mol / L as electrolyte solution, voltage gradient is 1.5v / cm, PRB material is mass ratio zeolite ( 1-2mm): Fe 0 =1:1. Set 5 sampling points between the two electrodes, and take samples and record changes in cu...

Embodiment 3

[0040] 7.5kg of kaolin was used in the test, and the poisoning amount of Cd in the expected soil was 300mg / kg, and the poisoning amount of Cu was 500mg / kg, and the Cd(NO 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 moisture content of the soil at 30%), fully stir and mix and retain the sample. Electrolyte solution: 0.1mol / LNaNO3; Citric acid-sodium citrate buffer solution (pH=5), also can use the citric acid of 0.1mol / L as electrolyte solution, voltage gradient is 1.5v / cm, PRB material is mass ratio zeolite ( 1-2mm): Fe 0 =1:1, after 24 hours of balance, start timing from power on, take samples and record every 24 hours, and finally analyze and calculate the removal rate of each point.

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 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

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 Patents(China)
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
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