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Novel method for repairing soil polluted by heavy metals such as cadmium, lead, mercury and chromium

A technology for chromium-contaminated soil and contaminated soil is applied in the field of heavy metal-contaminated soil remediation, which can solve the problems of difficulty in implementation, high cost, limited remediation capacity for moderately and severely polluted soil, etc., and achieves the effect of complete fixation

Pending Publication Date: 2022-02-11
INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0043] Among the above patented technologies, many technologies are relatively effective for the remediation of lightly polluted soil, but relatively limited for the remediation of moderately and heavily polluted soil; some patented technologies have obvious effects in the remediation of moderately and heavily polluted soil, but there are links Complex or costly problems, difficult to implement in practical applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The pH of a cadmium-mercury composite polluted soil is 5.7, and the available cadmium and available mercury contents are 1.40mg / kg and 0.67mg / kg respectively. Take 10kg of the soil, crush it, pass through a 5mm sieve, add 30g of sulfur-containing and phosphorus-containing composite materials, and mix thoroughly. Homogenize the soil, add 2.2L of deionized water, leave it for 2 months, measure the soil pH to 3.0, then add 50g of pH-enhancing composite material and 10g of passivation composite material, mix with the soil again, add 1.5L of deionized water, pass The measured soil pH was 5.8 in 2 weeks, the available cadmium content was 0.17mg / kg, and the available mercury content was 0.15mg / kg.

Embodiment 2

[0082] The pH of a cadmium-lead compound polluted soil is 6.1, the effective cadmium content is 0.87mg / kg, and the effective lead content is 220mg / kg. Take 10kg of the soil, crush it, pass through a 5mm sieve, add 35g of sulfur- and phosphorus-containing composite materials, and mix the soil thoroughly , add 2.2L of deionized water, leave it for 2 months, measure the soil pH to 3.2, then add 60g of pH-enhancing composite materials and 12g of passivation composite materials, mix with the soil again, add 1.5L of deionized water, and pass 2 weeks The measured soil pH is 5.5, the available cadmium content is 0.14mg / kg, and the available lead content is 62mg / kg.

Embodiment 3

[0084] The soil pH of a cadmium-lead compound polluted cultivated land is 5.3, the effective cadmium content is 1.23mg / kg, and the effective lead content is 280mg / kg. 2 Evenly spread 6.0t of sulfur-containing and phosphorus-containing materials, then carry out deep plowing and harrowing operations, and then irrigate, leave it for 2 months, measure the soil pH to 3.7, and then, every hm 2 Add 7.5t of pH-increasing composite materials and 2.5t of passivation composite materials, carry out deep plowing, raking, and irrigation operations again, and after 2 weeks, the measured soil pH is 6.0, the effective cadmium content is 0.22mg / kg, and the effective lead content is 55mg / kg .

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Abstract

The invention discloses a novel method for repairing soil polluted by heavy metals such as cadmium, lead, mercury and chromium. The repairing method comprises two steps for repairing the soil polluted by the heavy metals such as cadmium, lead, mercury and chromium: the first step is to add composite materials such as a sulfur-containing material and a phosphorus-containing material, and carry out soil acidification process to enhance release of positive ions of the heavy metals such as cadmium, lead and mercury, wherein through an oxidation-reduction reaction in the soil acidification process, hexavalent chromium is reduced into harmless trivalent chromium; and the second step is to add a composite combination material and a passivation material for improving the pH value of the soil, so that passivation and fixation of heavy metals such as cadmium, lead, mercury and chromium are realized in the process of improving the pH value of the soil. The method has the outstanding advantages of being rapid in acidification, accurate in acidification, thorough in repair, high in safety, simple in repair link and the like. By applying the combination material and the method disclosed by the invention, a complete repair of soil in single-element pollution or combined pollution of heavy metals such as cadmium, lead, mercury and chromium can be realized.

Description

technical field [0001] The invention relates to the technical field of remediation of soil polluted by heavy metals, in particular to a new method for remediating soil polluted by heavy metals cadmium, lead, mercury and chromium. Background technique [0002] Heavy metal pollution such as cadmium, lead, mercury, and chromium is the main pollution source of cultivated land soil in my country. Among them, cadmium, lead, and mercury pollution sources enter plants in the form of cations, and accumulate in agricultural products to form excessive pollution of cadmium, lead, and mercury elements; Harm plants and agricultural products with hexavalent chromium. Heavy metal pollution includes excessive pollution of a single heavy metal element, and composite pollution of two or more heavy metal elements exceeding the standard. Heavy metal pollution in cultivated land in China occupies a relatively large area. Song Wei et al. (2013) calculated the heavy metal pollution in cultivated la...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 唐拴虎逄玉万黄建凤黄旭黄巧义张木易琼付弘婷李苹吴永沛程根吴腾飞
Owner INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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