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Method for in-situ solidification-removal of heavy metals in soil

An in-situ solidification and heavy metal technology, applied in the field of soil remediation, can solve the problems of high purification efficiency, low cost, and long idle time of soil, and achieve the effect of broad market prospects

Inactive Publication Date: 2014-08-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method proposed by the present invention has the following advantages: (1) low cost; the raw material of the straw rope heavy metal adsorption material has a wide source, and the processing and application do not depend on large-scale machinery and equipment, which is convenient for promotion and application; (2) green and environmental protection; the straw rope is renewable , Degradable biomass materials, less interference to the soil environment in soil remediation projects; (3) Good remediation effect: overcoming the traditional in-situ immobilization-passivation technology that only reduces the bioavailability of heavy metals, but heavy metals still remain in the Soil, the shortcomings of heavy metal pollution risks; (4) High purification efficiency; overcome the shortcomings of phytoremediation that takes years and the soil is idle for a long time

Method used

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  • Method for in-situ solidification-removal of heavy metals in soil

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Put the rice straw rope with a diameter of 5mm in the modified solution (the solute is chitin, the solvent is acetic acid aqueous solution with a volume concentration of 2%, and the mass concentration of chitin is 0.1%). The solid-liquid ratio of the straw rope to the modified solution is 1Kg / 10L, take it out after 1 hour of modification reaction, put it in an oven, and bake it at 80°C for 5 minutes to obtain the modified straw rope. Apply the modified straw ropes in a parallel arrangement to the soil where the heavy metal Cu exceeds the standard. The depth of the straw ropes buried in the soil surface is 10cm, the distance between the straw ropes is 10cm, and the application amount of the modified straw ropes is 300Kg / mu to control the soil quality. The water content is 20%~40%, and the soil pH value is 6~7. After 15 days, the modified straw rope is taken out from the soil to complete the in-situ solidification and removal of heavy metals in the soil. The heavy metal ad...

Embodiment 2

[0018] Put the wheat straw rope with a diameter of 25mm in the modified solution (the solute is urea, the solvent is water, the mass concentration of urea is 5%), the solid-liquid ratio of the straw rope to the modified solution is 1Kg / 10L, and the modification reaction is 2 Take it out after one hour, place it in an oven, and bake it at 100°C for 10 minutes to obtain a modified straw rope. Apply the modified straw ropes in a parallel arrangement to the soil with heavy metal Zn exceeding the standard. The depth of the straw ropes buried in the soil surface is 20cm, the distance between the straw ropes is 20cm, and the application amount of the modified straw ropes is 400Kg / mu to control the soil quality. The water content is 20%~40%, and the soil pH value is 6~7. After 45 days, the modified straw rope is taken out from the soil, and the in-situ solidification and removal of heavy metals in the soil are completed. The heavy metal adsorption capacity of the modified straw rope is...

Embodiment 3

[0020] Put a wheat straw rope with a diameter of 15mm in the modified solution (the solute is ammonia water, the solvent is water, and the ammonia mass concentration is 3%). The solid-liquid ratio of the straw rope to the modified solution is 1Kg / 10L, and the modification reaction is 1.5 Take it out after one hour, place it in an oven, and bake it at 100° C. for 5 minutes to obtain a modified straw rope. Apply the modified straw ropes in a parallel arrangement to the soil with heavy metal Pb exceeding the standard. The depth of the straw ropes buried in the soil surface is 10cm, the distance between the straw ropes is 20cm, and the application amount of the modified straw ropes is 300Kg / mu to control the soil quality. The water content is 20%~40%, and the soil pH value is 6~7. After 30 days, the modified straw rope is taken out from the soil to complete the in-situ solidification and removal of heavy metals in the soil. The heavy metal adsorption capacity of the modified straw ...

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Abstract

The invention belongs to the field of soil remediation, and relates to a method for in-situ solidification-removal of heavy metals in soil. The method comprises the following steps: modifying a straw rope, applying to soil with excessive heavy metals, and furthermore taking out the straw rope onto which the heavy metals are adhered from the soil, thereby accomplishing in-situ solidification-removal of the heavy metals in the soil. The method provided by the invention has the advantages that firstly, the cost is low, and the machining and the application do not depend on large-size machines or equipment, so that the method is convenient to popularize and use; secondly, the method is environmental friendly as the straw rope is made of a recyclable biologic material which is small in interference to the soil environment; thirdly, the remediation effect is good as the defects that a conventional in-situ fixation-passivation technique is used for only degrading the biologic effectiveness of the heavy metal but the heavy metal is still retained in the soil and the heavy metal pollution risk still exists are solved; fourthly, the purification efficiency is high, and the defects that a plant remediation method takes years and the soil idle time is long are solved. The method provided by the invention can be also applied to purification on soil with excessive heavy metals, and is wide in market prospect.

Description

technical field [0001] The invention belongs to the field of soil restoration, and relates to a method for solidifying in situ and removing soil heavy metals. Background technique [0002] Soil heavy metal pollution has the characteristics of concealment, hysteresis, accumulation and irreversibility, so its treatment is relatively difficult. At present, the in-situ treatment technologies for heavy metal-excessive soil are mainly fixed passivation technology and phytoremediation technology. [0003] Fixed passivation technology refers to adding a fixative to the soil to adjust and change the physical and chemical properties of heavy metals in the soil to cause a series of reactions such as precipitation, adsorption, ion exchange, humification and oxidation-reduction, and reduce its Bioavailability and mobility in the soil environment, thereby reducing the toxicity of these heavy metal elements to animals and plants. Because of its low cost, convenient operation and quick e...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 吕银祥
Owner FUDAN UNIV
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