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Application of polyamino polyether methylene phosphonate in clearance of cadmium contamination in soil

A polyamino polyether-based, ether-based methylene phosphonic acid technology, which is applied in the field of leaching and remediation of cadmium-contaminated soil, can solve the problems of lack of research on soil leaching and remediation, and achieve strong biodegradability, low environmental risk, and operability strong effect

Inactive Publication Date: 2014-02-19
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, PAPEMP is only used in water treatment and other industries, and there is a lack of related research on soil leaching and restoration.

Method used

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  • Application of polyamino polyether methylene phosphonate in clearance of cadmium contamination in soil
  • Application of polyamino polyether methylene phosphonate in clearance of cadmium contamination in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Accurately weigh 1.00 g of artificial cadmium-contaminated soil samples, and the concentration of heavy metal cadmium in the soil is 5 mg kg -1 According to the solid-to-liquid ratio of 1:25, PAPEMP solutions with concentrations of 0.01, 0.02, 0.06, 0.10, 0.14, 0.18, and 0.22 mol / L were added. Shake at room temperature for 12 h, then stand still for 12 h, centrifuge at 4000 r / min for 20 min, filter, and determine the content of heavy metal cadmium in the supernatant, each treatment is repeated 3 times.

[0011] Table 1 The effect of PAPEMP on the removal rate of heavy metal cadmium.

[0012] Eluent concentration (mol / L) CK 0.01 0.02 0.06 0.10 0.14 0.18 0.22 Removal rate (%) 10 55 67 73 89 83 82 82

[0013] The results showed that the maximum removal rate of heavy metal Cd reached 89% by using PAPEMP to remediate artificial cadmium-contaminated soil by oscillating leaching.

Embodiment 2

[0015] Accurately weigh 1.00 g of artificial cadmium-contaminated soil samples, and the concentration of heavy metal cadmium in the soil is 10 mg kg -1 According to the solid-to-liquid ratio of 1:25, PAPEMP solutions with concentrations of 0.01, 0.02, 0.06, 0.10, 0.14, 0.18, and 0.22 mol / L were added. Shake at room temperature for 12 h, then stand still for 12 h, centrifuge at 4000 r / min for 20 min, filter, and determine the content of heavy metal cadmium in the supernatant, each treatment is repeated 3 times.

[0016] Table 2 The effect of PAPEMP on the removal rate of heavy metal cadmium.

[0017]

[0018] The results show that the removal rate of heavy metal Cd can reach up to 85% by using PAPEMP to remediate artificial cadmium-contaminated soil by oscillating leaching.

Embodiment 3

[0020] The cadmium-contaminated soil collected from the abandoned Zhangshi irrigation area in Shenyang was used for vibration leaching experiments, and the cadmium concentration was 12 mg kg -1 . Accurately weigh 1.00 g of contaminated soil samples, and add PAPEMP solutions with concentrations of 0.01, 0.02, 0.06, 0.10, 0.14, 0.18, and 0.22 mol / L according to the solid-to-liquid ratio of 1:25. Shake at room temperature for 12 h, then stand still for 12 h, centrifuge at 4000 r / min for 20 min, filter, and determine the content of heavy metal cadmium in the supernatant, each treatment is repeated 3 times.

[0021] Table 3 The effect of PAPEMP on the removal rate of heavy metal cadmium.

[0022]

[0023] The results showed that the cadmium-contaminated soil in Zhangshi irrigation area was repaired by using PAPEMP by means of vibration leaching, and the removal rate of heavy metal Cd was up to 81%.

[0024] From the above three examples, it can be seen that regardless of t...

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Abstract

The invention relates to application of polyamino polyether methylene phosphonate (PAPEMP) in clearance of cadmium contamination in soil. PAPEMP with a concentration of 0.01 to 0.22 mol / L is used as a leaching agent and added into cadmium-contaminated soil, then oscillation at room temperature and centrifugation are carried out, and an eluate is collected to finish leaching; a solid liquid ratio of the contaminated soil to the leaching agent is 1: 25. Experiments show that the leaching agent exerts a good clearance effect on cadmium in soil. Application of PAPEMP has the advantages of high restoration efficiency, strong operability, low environmental risks, etc.

Description

technical field [0001] The invention relates to the technical field of cadmium-contaminated soil leaching and repairing, in particular to the application of polyaminopolyether-based methylene phosphonic acid in removing cadmium pollution from soil. Background technique [0002] Cadmium (Cd) is one of the most toxic heavy metals. As human activities promote the biogeochemical cycle of Cd, the release of Cd is increasing, and most of it enters the soil. Cd accumulated in the soil not only harms the soil ecosystem, but also endangers human health through direct contact and enrichment in the food chain. A large amount of Cd polluted soil needs to be treated urgently. [0003] Leaching technology is an effective method to remediate contaminated soil. The leaching agents currently used for soil leaching mainly include inorganic leaching agents, artificial chelating agents, surfactants, and natural organic acids. EGTA has strong activation ability and good selectivity to Cd, but ...

Claims

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Application Information

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IPC IPC(8): B09C1/02
Inventor 崔爽刘艺芸李萍赵杉林孙秀菊李杨
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY