Novel method for repairing heavy metal cadmium, arsenic, mercury, lead and chromium combined polluted soil

A technology of combined pollution and heavy metals, applied in the field of soil remediation, can solve the problems of high cost, cumbersome technical operation links, and inadvisable practical operation, and achieve the effect of complete remediation.

Pending Publication Date: 2022-03-18
INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The trend is that in the early days, phytoremediation was the main body, and in recent years, it has gradually developed into technologies such as passivation and leaching. At the same time, many technologies seem to be effective, but they ...

Method used

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Examples

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Embodiment 1

[0119] This embodiment provides a method for repairing arsenic-containing heavy metal soil, comprising the following steps:

[0120] Soil to be repaired: a cadmium-arsenic complex polluted soil has a pH of 5.8, an effective cadmium content of 1.24mg / kg, and an effective arsenic content of 175mg / kg.

[0121] The composition of the restoration material used: by mass parts, the acidified material includes 80 parts of sulfur-containing components (sulfur) and 7 parts of phosphorus-containing components (ammonium dihydrogen phosphate); by mass parts of the same standard as the acidified material, The first passivation material includes 8 parts of a stabilizing component (citric acid) and 5 parts of a passivating component (iron oxide). The material to increase soil pH is slaked lime. The second passivation material is magnesium silicate.

[0122] Take 10kg of the soil, crush it, pass through a 5mm sieve, add 35g of sulfur-containing and phosphorus-containing composite materials, ...

Embodiment 2

[0124] This embodiment provides a method for repairing arsenic-containing heavy metal soil, comprising the following steps:

[0125] Soil to be repaired: The pH of a cadmium, arsenic and mercury compound polluted soil is 5.9, and the available cadmium, available arsenic, and available mercury contents are 1.56mg / kg, 260mg / kg, and 0.87mg / kg, respectively.

[0126] The composition of the restoration material used: in parts by mass, the acidification material includes 80 parts of sulfur-containing components (sulfur) and 7 parts of phosphorus-containing components (phytic acid); The passivation material includes 8 parts of stabilizing component (EDTA) and 5 parts of passivating component (iron oxide). The material to increase soil pH is slaked lime. The second passivation material is sodium silicate.

[0127] Take 10kg of the soil, crush it, pass through a 5mm sieve, add 30g of sulfur-containing and phosphorus-containing composite materials, 25g of the first passivation materia...

Embodiment 3

[0129] This embodiment provides a method for repairing arsenic-containing heavy metal soil, comprising the following steps:

[0130] Soil to be repaired: The soil pH of a cadmium-arsenic-lead compound polluted farmland is 5.5, the effective cadmium content is 1.23mg / kg, the effective arsenic content is 135mg / kg, and the effective lead content is 270mg / kg.

[0131] The composition of the restoration material used: in parts by mass, the acidified material includes 80 parts of sulfur-containing components (sulfamic acid) and 7 parts of phosphorus-containing components (ammonium dihydrogen phosphate); In total, the first passivation material includes 8 parts of a stabilizing component (citric acid) and 5 parts of a passivating component (a mixture of equal amounts of ferrous sulfate and iron oxide). The material to increase soil pH is slaked lime. The second passivation material is an equal mixture of magnesium silicate and iron powder.

[0132] per hm 2 Evenly spread 6.0t of s...

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Abstract

The invention discloses a novel method for repairing heavy metal cadmium, arsenic, mercury, lead and chromium combined polluted soil, and relates to the technical field of soil repairing. The inventor improves the remediation material and method for the heavy metal compound contaminated soil, soil acidification is accelerated through an acidification material and a first passivation material, arsenic passivation fixation and dichromate ion reduction are conducted through acidification and oxidation-reduction reaction in the acidification process, meanwhile, release of adsorbed chromium, cadmium, mercury and lead is accelerated, and the remediation effect of the heavy metal compound contaminated soil is improved. And then a soil pH increasing material and a second passivation material are added, so that cadmium, mercury, lead and chromium cations are rapidly and completely passivated, and the two-step operation can realize complete fixation of cadmium, arsenic, mercury, lead and chromium pollution elements in the polluted soil and thorough remediation.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a new method for remediating heavy metal cadmium, arsenic, mercury, lead and chromium composite polluted soil. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the rate of points exceeding the standard in cultivated land in my country is 19.4%, and the proportions of points with slight, light, moderate and severe pollution are respectively 13.7%, 2.8%, 1.8% and 1.1%, and the main pollutants are cadmium, nickel, copper, arsenic, mercury, lead, etc.; From the perspective of pollution distribution, the soil pollution in the south is heavier than that in the north; the Yangtze River Delta, the Pearl River Delta, the Northeast The problem of soil pollution in some areas such as old industrial bases is more serious, and the range of h...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 唐拴虎黄巧义易琼张木黄旭黄建凤逄玉万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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