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A kind of lead and cadmium polluted soil remediation agent and its remediation method

A technology for cadmium-contaminated soil and contaminated soil, which is applied in the field of lead-cadmium-contaminated soil remediation agent and its remediation, which can solve the problems of redissolution of heavy metals, achieve long-term stability of remediation effect, increase soil water holding rate, and large surface area.

Active Publication Date: 2022-05-10
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, this method is easily affected by external environmental conditions. Changes in environmental conditions such as soil pH and redox potential may cause heavy metals to dissolve again.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using reed straw as raw material, soaked in phosphoric acid, and pyrolyzed at 600 °C for 3 h with limited oxygen, the obtained biochar was passed through a 60-mesh sieve and added to 0.25 mol / L FeSO at a solid-liquid ratio of 1:20. 4 and 0.1mol / L MnCl 2 The mixed solution was mixed for 30min, added the same volume of 0.3mol / L potassium permanganate solution, mixed, and let stand for 1h. 1:8, manganese:char 1:15.

[0028] Lead and cadmium contaminated soil remediation agent, by mass, 10% activator, 70% stabilizer, 20% long-acting stabilizing adjuvant, of which the activator is phosphoric acid, the long-acting stabilizing adjuvant is 75% quicklime, peroxide Calcium 25% mixed well. That is, the lead-cadmium-contaminated soil remediation agent is obtained.

[0029] The above lead and cadmium contaminated soil remediation agent was applied to the soil remediation of a polluted site in a mining area. The content of Cd and Pb in the soil of the site exceeded the "Soil Envir...

Embodiment 2

[0035] Lead and cadmium contaminated soil remediation agent, by mass, 8% activator, 85% stabilizer, 7% long-acting stabilizing adjuvant, of which the activator is calcium dihydrogen phosphate, and the long-acting stabilizing adjuvant is 60% quicklime by mass content , calcium peroxide 40% mixed evenly. That is, the lead-cadmium-contaminated soil remediation agent is obtained. The preparation of stabilizer is the same as in Example 1.

[0036] The above-mentioned lead and cadmium contaminated soil remediation agent was applied to the remediation of soil in a paddy field. The soil pH value was 5.45 and the Cd content was up to 1.44mg / kg, which exceeded the "Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard (Trial)" (GB36600 -2018), the risk screening value is 3.8 times, which is close to the risk control value and belongs to acid high cadmium soil. The analysis of lead and cadmium species showed that the effective state of cadmium in the soil ac...

Embodiment 3

[0043] Corn cob was used as raw material, soaked in phosphoric acid, and then cracked at 650°C for 4 hours with limited oxygen. The obtained biochar was passed through a 60-mesh sieve and added to 0.30mol / L FeSO at a solid-liquid ratio of 1:20. 4 and 0.2mol / L MnCl 2 The mixed solution was mixed for 30min, added the same volume of 0.3mol / L potassium permanganate solution, mixed, and let stand for 1h. 1:6, manganese:carbon 1:9.

[0044]Lead and cadmium contaminated soil remediation agent, by mass, 15% activator, 75% stabilizer, 10% long-term stabilization auxiliary, wherein the activator is phosphoric acid and calcium dihydrogen phosphate mixed in a mass ratio of 1:10, long-term stability According to the mass content of the auxiliary agent, 65% of quicklime and 35% of calcium peroxide are mixed evenly. That is, the lead-cadmium-contaminated soil remediation agent is obtained.

[0045] The above-mentioned remediation agent was applied to the remediation of Pb-contaminated soi...

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PUM

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Abstract

The invention belongs to the technical field of soil pollution restoration, and relates to a lead-cadmium contaminated soil restoration agent and a restoration method thereof. The repairing agent is an activator, a stabilizer and a long-acting stabilizing auxiliary agent. According to mass percentage, the activator is 2-40%, the stabilizing agent is 30-85%, and the long-acting stabilizing auxiliary agent is 2-30%. The method of the present invention proposes a three-step restoration method of activation, stabilization and long-term maintenance of heavy metals in the soil, which can effectively reduce the content of heavy metals in the unstable bonded state in the soil, and make the heavy metals in the free state and unstable bonded state all interact with the stabilizer Response, and the use of long-term stabilizing auxiliary agents to ensure the stability of the soil environment, so that the repair effect is stable for a long time.

Description

technical field [0001] The invention belongs to the technical field of soil pollution restoration, and relates to a lead and cadmium contaminated soil restoration agent and a restoration method thereof. Background technique [0002] Mining, metal smelting, chemical production, application of chemical fertilizers and pesticides and other processes cause a large amount of cadmium and lead to enter the soil and spread to surrounding areas through precipitation and acidification, which seriously threatens human health and ecological security. [0003] At present, soil heavy metal remediation technologies include foreign soil method, physicochemical remediation method, phytoremediation method, chemical remediation method, etc. Among them, chemical stabilization remediation transforms heavy metals from an effective state to a relatively stable form through the use of chemical remediation agents, reducing their mobility and bioavailability. It can be applied not only to the remedi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 魏小娜杨思宇范志平王琼李敏侯欣园
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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