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Method for continuously remediating soil cadmium contamination by using chelating agent EDDS and ramie

A technology for soil remediation and chelating agent, applied in the field of soil pollution control, can solve problems such as secondary pollution of surface water, and achieve the effects of developed root system, continuous soil remediation and fast growth

Inactive Publication Date: 2015-04-29
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are existing technologies for soil remediation using chelating agent EDTA and plants, the above-mentioned complexing agents represented by EDTA are non-degradable complexing agents, and a large amount of application is likely to cause secondary pollution to surface water. At present, EDTA, NTA The problem of environmental pollution has been concerned, and the use of EDTA in cleaning agents has been banned in Europe

Method used

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  • Method for continuously remediating soil cadmium contamination by using chelating agent EDDS and ramie
  • Method for continuously remediating soil cadmium contamination by using chelating agent EDDS and ramie
  • Method for continuously remediating soil cadmium contamination by using chelating agent EDDS and ramie

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Effect test

Embodiment 1

[0052] The method for chelating agent EDDS of the present invention and ramie to continuously restore soil cadmium pollution may further comprise the steps:

[0053] Implanting ramie into the soil to be repaired;

[0054] After the ramie survives, apply the biodegradable chelating agent EDDS to the soil at an application rate of 300kg / mu, and sprinkle it on the surface of the soil to be repaired at one time, and then immediately water it, dissolve it and wash it into the soil;

[0055] Every 30 days, irrigate once with the EDDS solution of 0.009mol / L with concentration, and carry out normal irrigation according to the needs of field ramie growth in the rest of the time;

[0056] The stalks and leaves of the aerial part of ramie can be harvested every 3 months, and the underground part can be left in the soil to continue to breed and grow;

[0057] Every time the ramie is planted into the soil, it can be harvested together with the underground part after 3 years. If it is nece...

Embodiment 2

[0059] The ramie seedling that the height that will cultivate is 40cm is implanted in the soil to be repaired;

[0060] After the ramie survives, apply the biodegradable chelating agent EDDS to the soil at an application rate of 150kg / acre, ditch it once and apply it to the surface of the soil to be repaired, and immediately irrigate it, dissolve it and wash it into the soil;

[0061] Every 30 days, the EDDS solution with a concentration of 0.015mol / L was irrigated once, and the rest of the time was normally irrigated according to the needs of field ramie growth. The pH value of the EDDS solution was adjusted to be the same as the pH value of the soil to be repaired with NaOH.

[0062] The stalks and leaves of the aerial part of ramie can be harvested every 2 months, and the underground part can be left in the soil to continue to breed and grow;

[0063] Every time the ramie is planted into the soil, it can be harvested together with the underground part after 2 years. If it i...

Embodiment 3

[0065] Apply base fertilizer to the soil to be repaired, and the base fertilizer is (NH 4 ) 2 SO 4 , KH 2 PO 4 , K 2 SO 4 , the application can be determined according to the reasonable needs of the growth of ramie;

[0066] It is the ramie seedling of 45cm that the height that will cultivate is good, selects the good similar ramie of growing way to transplant, and implants in the soil to be repaired;

[0067] After the ramie survives, apply the biodegradable chelating agent EDDS to the soil again, the application rate is 75kg / mu, dissolve the chelating agent EDDS in water, and apply it to the soil to be repaired with the irrigation water at one time during irrigation;

[0068] Every 30 days, the EDDS solution with a concentration of 0.005mol / L was irrigated once, and the rest of the time was normally irrigated according to the needs of field ramie growth. The pH value of the EDDS solution was adjusted to be the same as the pH value of the soil to be repaired with NaOH. ...

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Abstract

The invention belongs to the technical field of remediation of soil contamination, and particularly relates to a method for continuously remediating soil cadmium contamination by using a chelating agent EDDS and ramie. The method comprises the following steps: after ramie survives, applying the biodegradable chelating agent EDDS to the soil, wherein the application amount of the chelating agent is 75-300kg / mu; irrigating the ramie every 30 days by using an 0.005-0.015mol / L EDDS solution, and normally irrigating the ramie in the rest of time; and regularly harvesting aboveground stems and leaves of the ramie, and leaving the underground parts of the ramie to further grow. Compared with the prior art, the method disclosed by the invention is better in remediation effect and more environmentally-friendly; and the method is easy to operate, and has certain economic benefits, and therefore, the method has a board promotion prospect.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a method for continuously repairing soil heavy metal pollution with chelating agent EDDS and ramie. Background technique [0002] The destruction of soil ecological functions and agricultural products caused by heavy metal pollution in soil have attracted increasing public attention. Heavy metals not only directly poison soil organisms and plants, destroy soil structure, but can also migrate and transform through the food chain, endangering human health. In recent years, there have been many major heavy metal pollution incidents in my country, which have seriously threatened the lives and health of the people. Soil heavy metal pollution is closely related to the safety of agricultural products, and is related to the atmospheric environment and water environment through the soil atmosphere and soil-water interface. Therefore, how to repair heavy metal-co...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 殷宪强孙慧敏陈卫民韦革宏刘金彭绍远
Owner NORTHWEST A & F UNIV
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