Compound agent for repairing heavy metal contaminated soil and application thereof

A technology of polluted soil and heavy metals, applied in the direction of restoration of polluted soil, application, soil conditioning materials, etc., can solve the problem of low stability rate of heavy metals, achieve the effect of improving stability efficiency and alleviating the leaching of cadmium

Active Publication Date: 2018-10-12
YONKER ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is that the remediation agent in the prior art has a low stability rate to heavy metals in the soil, and it is difficult to make the soil pol

Method used

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  • Compound agent for repairing heavy metal contaminated soil and application thereof
  • Compound agent for repairing heavy metal contaminated soil and application thereof
  • Compound agent for repairing heavy metal contaminated soil and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1:

[0035] Test sample and restoration goal: Collect a portion of the lower clayey soil at a pesticide factory in Hunan, and pass it through a 2mm sieve after natural air drying. The total arsenic and cadmium content of the soil are 1729mg / kg and 11mg / kg, respectively. The arsenic and cadmium concentrations of the extract are respectively. It was 6.80 and 0.012mg / L, and the pH was 8.11 (Table 1). The soil leaching method is in accordance with the HJ / T 557-2009 standard of "Solid waste leaching toxicity leaching method horizontal oscillation method". After restoration, the soil leaching solution must meet the requirements of the "Surface Water Environmental Quality Standard" GB 3838-2002 IV standard (Cd <5μg / L; As <50μg / L). The compliance and stability efficiency requirements of arsenic and cadmium are 99.3% and 58% respectively.

[0036] Pharmaceutical preparation: Weigh 50g of iron sulfate, 20g of ferrous sulfate, 20g of calcium carbonate, 9g of sodium lignosulfon...

Example Embodiment

[0041] Example 2:

[0042] Test samples and restoration targets: Collect surface sandy soil in a project in Baiyin, Gansu, and pass through a 2mm sieve after natural air drying. The total arsenic and cadmium contents are 153.8 and 23.8 mg / kg, respectively, and the arsenic and Cd concentrations in the leachate are 77 and 45 μg / g, respectively. L, pH is 6.93 (Table 2). The soil leaching method is in accordance with the HJ / T 557-2009 standard of "Solid waste leaching toxicity leaching method horizontal oscillation method", and the soil leaching solution after restoration must meet the requirements of "Groundwater Environmental Quality Standard" (GB / T 14848-2017) III standard (Cd) <10μg / L; Arsenic <50μg / L). The compliance and stability efficiency requirements of arsenic and cadmium are 35% and 77.8% respectively.

[0043] Pharmaceutical preparation: Weigh 43g of iron sulfate, 28g of calcium hydroxide, 20g of heavy calcium carbonate, 6g of sodium lignosulfonate and 3g of dehydrated thi...

Example Embodiment

[0048] Example 3:

[0049] Test sample and restoration target: Collect surface miscellaneous fill in a chemical plant in Hunan, and pass it through a 2mm sieve after natural air drying. The total arsenic (As), cadmium (Cd), lead (Pb) and zinc (Zn) contents are 1359 respectively , 509, 13399 and 20100 mg / kg, the concentration of As, Cd, Pb and Zn in the extract were 277, 468, 279 and 1820 μg / L, respectively, and the pH was 7.14 (Table 6). The soil leaching method complies with the HJ / T 557-2009 standard of "Solid waste leaching toxicity leaching method horizontal oscillation method", and the soil leaching solution after restoration shall meet the requirements of the "Surface Water Environmental Quality Standard" GB 3838-2002 IV standard. As, Cd, Pb and Zn meet the standard and stable efficiency requirements of 81.9%, 98.9%, 82.1% and 45% respectively.

[0050] Pharmaceutical preparation: weigh 35g of iron sulfate, 10g of calcium hydroxide, 40g of heavy calcium carbonate, 5g of sodi...

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Abstract

The present invention discloses a compound agent for repairing heavy metal contaminated soil and an application thereof. The compound agent comprises the following components in parts by mass: 30-75 parts of soluble ferric salts and/or ferrous salts, 10-60 parts of calcium-based compounds, 5-20 parts of sodium lignosulfonate and 2-10 parts of an organic sulfur chelating agent. The soluble ferric salts and/or ferrous salts, calcium-based compounds, sodium lignosulfonate, and organic sulfur chelating agent of sodium dimethyl dithiocarbamate, etc. can effectively repair the compound contaminatedsoil by heavy metals of arsenic, cadmium, etc.

Description

technical field [0001] The invention relates to a compound agent for remediating heavy metal-contaminated soil and its application, in particular to the field of arsenic and cadmium compound heavy metal-contaminated soil remediation. Background technique [0002] In the soil environment, heavy metals such as arsenic (As) and cadmium (Cd) have great potential harm to human production and life due to their high toxicity and strong migration ability. In metallurgy, arsenic smelting, electroplating, tanning, paint, pigment chemical industry and other industries, there are varying degrees of heavy metal emissions such as arsenic and cadmium, making soil arsenic and cadmium pollution one of the main pollution types of industrial land in my country. In order to prevent heavy metals such as arsenic and cadmium from causing harm to the ecological environment and human health, my country has carried out explorations in multiple directions on the remediation technology of heavy metals ...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C09K109/00
CPCB09C1/08C09K17/40C09K2109/00
Inventor 周斌何宇宁魏来石燕刘仁和李静邵煜锟
Owner YONKER ENVIRONMENTAL PROTECTION
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