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Remediation method for heavy metal-contaminated soil

A technology of polluted soil and remediation method, which is applied in the restoration of polluted soil and other directions, can solve the problems of increasing environmental risks, difficult degradation of artificial strong chelating agents, and damage to soil physical and chemical properties, so as to reduce soil heavy metal content and improve soil physical and chemical properties. , Permanent and efficient removal effect

Active Publication Date: 2021-05-28
FUJIAN LONGKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Selecting an appropriate leaching agent is the key to the soil leaching method, while traditional inorganic leaching agents such as hydrochloric acid and nitric acid will damage the physical and chemical properties of the soil, and artificial strong chelating agents such as EDTA are difficult to degrade in nature, increasing environmental risks ; Some environmentally friendly leaching agents face the problem of high cost and difficulty in applying to large-scale soil leaching projects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Preparation of rinse agent:

[0051] Soak fresh orange peel in hot water at 90°C for 5 minutes, drain the water with gauze, put it in an electric blast drying oven at 55°C for 24 hours, crush it with a pulverizer and pass through a 40-mesh sieve to obtain orange peel powder The orange peel powder and the dilute nitric acid of pH=2 are mixed according to the ratio of material to liquid 1g:10mL, and then the addition of surfactant is carried out by the mass ratio of orange peel powder and tea saponin at 2:1, at 60°C, the ultrasonic power Under the condition of 250W, carry out the extraction for 30min, then put it into a constant temperature oscillator, shake it under the condition of 25°C and 200rpm for 2h, centrifuge to obtain the orange peel extract, and the remaining component is the solid residue of orange peel. Prepare 0.1mol / L FeCl 3 solution as a secondary rinse.

[0052] (2) Rinsing effect

[0053] The test soil was air-dried, ground, and passed through a 1...

Embodiment 2

[0058] (1) Preparation of rinse agent:

[0059] Soak fresh orange peel in hot water at 90°C for 5 minutes, drain the water with gauze, put it in an electric blast drying oven at 55°C for 24 hours, crush it with a pulverizer and pass through a 40-mesh sieve to obtain orange peel powder The dilute nitric acid of orange peel powder and pH=2 is mixed according to material-liquid ratio 1g:10mL, then carries out the dosing of surfactant by mass ratio 20:1 by orange peel powder and sodium lauryl sulfate, at 60 ℃ , under the condition of ultrasonic power of 250W, extract for 30min, then put it into a constant temperature oscillator, vibrate at 25°C and 200rpm for 2h, centrifuge to obtain orange peel extract, and the remaining component is orange peel solid residue. Prepare 0.1mol / LFeCl 3 solution as a secondary rinse.

[0060] (2) Rinsing effect

[0061] The test soil was air-dried, ground, and passed through a 100-mesh sieve to measure its basic physical and chemical properties. T...

Embodiment 3

[0066] (1) Preparation of rinse agent:

[0067] Soak fresh orange peel in hot water at 90°C for 5 minutes, drain the water with gauze, put it in an electric blast drying oven at 55°C for 24 hours, crush it with a pulverizer and pass through a 40-mesh sieve to obtain orange peel powder ;Orange peel powder and dilute nitric acid with pH=2 are mixed at a volume ratio of 1g:10mL, and then the surfactant is added according to the mass ratio of orange peel powder and tea saponin at 2:1. At 60°C, the ultrasonic power is 150w The extraction was carried out for 30 minutes under the condition of 30 minutes, and then put into a constant temperature oscillator, after shaking for 2 hours at 25 ° C and 200 rpm, it was centrifuged to obtain the orange peel extract, and the remaining component was the solid residue of orange peel. Prepare 0.1mol / L FeCl 3 solution as a secondary rinse.

[0068] (2) Rinsing effect

[0069] The test soil was air-dried, ground, and passed through a 100-mesh si...

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Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to a remediation method for heavy metal-contaminated soil. The remediation method comprises the following steps: a) sequentially subjecting the heavy metal-contaminated soil to leaching with an orange peel leaching solution, washing with water and leaching with an FeCl3 solution, or leaching the heavy metal-contaminated soil by using a compound solution of the orange peel leaching solution and the FeCl3 solution; and b) mixing the leached soil with orange peel biochar to obtain repaired soil, wherein the orange peel leaching solution is a liquid-phase product obtained by ultrasonic extraction of a mixture of orange peel powder, acid liquor and a surfactant, and the orange peel biochar is a product obtained by carbonizing solid residues generated by the ultrasonic extraction. According to the method provided by the invention, resource utilization of agricultural wastes is realized, the content of heavy metals in the soil and environmental risks are reduced, the cost of eluting agents is low, the preparation process of the eluting agents is green and environment-friendly, operability is high, efficient combination of an eluting method and a stabilizing method is realized, and the defects of a single remediation method are overcome.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating heavy metal polluted soil. Background technique [0002] Soil is an indispensable part of the earth's ecosystem and is of great significance to the survival and development of humans, animals and plants. However, heavy metal pollution in soil has become a global prominent problem. If this problem cannot be effectively solved , will have a bad impact on the ecological environment, and the urgent task is to realize the rapid and efficient removal of heavy metals in the soil. The leaching method is one of the common methods for repairing heavy metal-contaminated soil. It mainly transfers the heavy metals in the soil to the leaching agent through physical and chemical effects by adding a leaching agent from an external source, so as to realize the permanent removal of heavy metals in the soil and has a repair cycle. Short, high repair ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 张彤张桐胡杰华肖尧
Owner FUJIAN LONGKING
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