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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 polluted by heavy metals, especially the soil polluted by arsenic and cadmium compound heavy metals (that is, contain arsenic and cadmium at the same time) pass through Reach the standard after governance

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

Embodiment 1

[0035] Test sample and restoration target: A portion of the lower layer of cohesive soil was collected in a pesticide factory in Hunan, and passed through a 2mm sieve after natural air-drying and grinding. are 6.80 and 0.012mg / L, and the pH value is 8.11 (Table 1). The soil leaching method implements the HJ / T 557-2009 standard of "Solid Waste Leaching Toxic Leaching Method Horizontal Oscillating Method". ; As<50μg / L). The standard and stable efficiency requirements for arsenic and cadmium are 99.3% and 58% respectively.

[0036] Pharmacy configuration: Weigh 50g of ferric sulfate, 20g of ferrous sulfate, 20g of calcium carbonate, 9g of sodium lignosulfonate and 3g of dehydrated formamic sodium into ziplock bags, and stir evenly.

[0037] Experimental procedure: Weigh 200g of NT1# soil sample, add 2.5%, 3% and 3.5% of the agent respectively, stir evenly, then add 20g of water, continue stirring to fully moisten the soil, and then transfer it to a ziplock bag for sealing and c...

Embodiment 2

[0042] Test sample and restoration target: The sandy soil on the surface was collected in a project in Baiyin, Gansu, and passed through a 2mm sieve after natural air drying. L, the pH value is 6.93 (Table 2). The soil leaching method implements the HJ / T 557-2009 standard of "Toxic Leaching Method for Solid Waste Leaching and Toxic Leaching Method" HJ / T 557-2009. <10μg / L; arsenic <50μg / L). The standard and stable efficiency requirements for arsenic and cadmium are 35% and 77.8%, respectively.

[0043] Drug configuration: Weigh 43g of ferric sulfate, 28g of calcium hydroxide, 20g of heavy calcium carbonate, 6g of sodium lignosulfonate and 3g of sodium thiocarbamate into ziplock bags, and stir evenly.

[0044] Experimental procedure: Weigh 200g of BY1# soil sample, add 0.5%, 0.75% and 1.25% of the agent respectively, stir evenly, then add 20g of water, continue to stir to make the soil fully wet, then transfer to a ziplock bag for sealing and curing for 2 days , according to ...

Embodiment 3

[0049] Test sample and repair target: The surface miscellaneous fill soil was collected in a chemical factory in Hunan, and passed through a 2mm sieve after natural air drying. The contents of total arsenic (As), cadmium (Cd), lead (Pb) and zinc (Zn) were respectively 1359 , 509, 13399 and 20100mg / kg, the concentrations of As, Cd, Pb and Zn in the leaching solution were 277, 468, 279 and 1820 μg / L, respectively, and the pH value was 7.14 (Table 6). The soil leaching method implements the HJ / T 557-2009 standard of "Solid Waste Leaching Toxic Leaching Method Horizontal Oscillation Method", and the remediation soil leachate must meet the "Surface Water Environmental Quality Standard" GB 3838-2002Ⅳ standard. The standard stable efficiency requirements of As, Cd, Pb and Zn are 81.9%, 98.9%, 82.1% and 45%, respectively.

[0050] Pharmacy configuration: Weigh 35g of ferric sulfate, 10g of calcium hydroxide, 40g of heavy calcium carbonate, 5g of sodium lignosulfonate and 10g of dehydr...

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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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