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Passivator for repairing mercury polluted soil, mercury polluted soil repairing method and application

A technology for soil remediation and mercury pollution, which is applied in the restoration of contaminated soil, chemical instruments and methods, and applications. The effect of reducing mercury content and no secondary pollution

Inactive Publication Date: 2017-01-04
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the supergene geochemical behavior of Hg element is far more complicated than that of other heavy metal elements, the repair effect of existing repair materials is still not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a passivating agent for mercury-contaminated soil remediation, including sulfur-containing reagents and iron-containing reagents stored separately, and the mass ratio of the sulfur-containing reagents and iron-containing reagents is 1:5 to 5:1; The sulfur-containing reagent is one or more of sulfur, sulfide, hydrosulfide, polysulfide and thiosulfate, and the iron-containing reagent is zero-valent iron, ferrous sulfate, ferrous sulfate hydrate, Ferrous ammonium sulfate, ferrous ammonium sulfate hydrate, ferric sulfate, ferrous chloride, ferrous chloride hydrate, ferric chloride, ferric chloride hydrate, polymeric ferric chloride, polymeric ferrous sulfate, trioxide One or more of iron and iron oxide.

[0025] Wherein, described sulfide is potassium sulfide, sodium sulfide, calcium sulfide, ammonium sulfide; Hydrosulfide is potassium hydrosulfide, sodium hydrosulfide, calcium hydrosulfide; Polysulfide is sodium polysulfide, potassium polysulfide, ...

Embodiment 2

[0034] This embodiment specifically carries out soil remediation on a heavy metal polluted site left over from an industrial relocation in Hubei. After testing, the average mercury content in the soil of the site reaches 300 mg / kg, the copper content reaches 2800 mg / kg, and the zinc content reaches 4600 mg / kg. Contaminated soil remediation method, the specific process is as follows:

[0035] 1) Add ferrous sulfate monohydrate powder to the heavy metal-contaminated soil and mix evenly with a stirring device. The mass ratio of ferrous sulfate monohydrate to contaminated soil (dry basis) is 1:100.

[0036] 2) Sodium sulfide is configured into an aqueous solution with a mass fraction of 10%, and the sodium sulfide solution is evenly sprayed in the soil after the first step treatment, and the mass ratio of sodium sulfide (dry basis) to the above-mentioned ferrous sulfate monohydrate added is 5 :1.

[0037] 3) The pH of the contaminated soil after the above treatment is tested to b...

Embodiment 3

[0041]In this example, soil remediation was performed on a mercury-contaminated site left over from an industrial relocation in Guangzhou. The average mercury content in the soil of the site was detected to be 110 mg / kg. The mercury-contaminated soil remediation method of the present invention was adopted, and the specific process was as follows:

[0042] 1) Add a mixture of ferrous sulfate heptahydrate powder and iron oxide powder to the mercury-contaminated soil, and mix evenly with a stirring device. The mass ratio of iron is 1:1.

[0043] 2) Add sodium polysulfide powder to the above treated soil and mix evenly with a stirring device. The mass ratio of sodium polysulfide to the above added ferrous sulfate heptahydrate is 1:2.

[0044] 3) The pH of the polluted soil after the above-mentioned treatment was tested to be 6.6, and quicklime was added to adjust the soil pH to 8.7.

[0045] 4) Spray tap water into the above-mentioned treated soil and stir evenly, keep the soil m...

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PUM

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Abstract

The invention provides a passivator for repairing mercury polluted soil. The passivator is prepared from a sulfur-containing reagent and an iron-containing reagent which are stored separately in a mass ratio of 1:5-5:1, wherein the sulfur-containing reagent is one or more of sulfur, sulfide, hydrosulfide, polysulfide and thiosulfate, and the iron-containing reagent is one or more of zero-valent iron, ferrous sulfate and hydrate thereof, ammonium ferrous sulfate and hydrate thereof, ferric sulfate, ferrous chloride and hydrate thereof, ferric chloride and hydrate thereof, polyferric chloride, poly ferrous sulfate, ferroferric oxide and ferric oxide. The sulfur-containing reagent and the iron-containing reagent in the passivator for repairing mercury polluted soil are stored separately, so that invalidation of effective ingredients of mercury in soil caused by reactions generated by mixing can be avoided. The passivator is wide in raw material source and low in cost. The repairing method is simple and feasible, is not sensitive to the soil type, has a remarkable repairing effect for various forms of mercury, does not have secondary pollution, and can be used for repairing cadmium, lead, zinc, copper or nickel heavy metal polluted soil.

Description

technical field [0001] The invention belongs to the technical field of remediation and treatment of heavy metal-contaminated soil, and in particular relates to a passivator for remediation of mercury-contaminated soil, a method for remediation of mercury-contaminated soil and its application. Background technique [0002] Mercury (Hg) is a heavy metal that is harmful to the human body. There are many ways for Hg to enter the soil, such as atmospheric deposition, discharge of industrial wastewater and domestic sewage, industrial solid waste and urban garbage, and application of pesticides and fertilizers. Hg will migrate and diffuse in soil over time, and undergo mutual conversion of chemical forms, especially the presence of methylmercury, which can pose a serious threat to the ecological environment, food safety and human health. Toxicology tests have proved that excessive intake of Hg can cause mercury poisoning, cause serious damage to the central nervous system, and end...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02C09K17/06B09C1/08
CPCC09K17/02B09C1/08C09K17/06
Inventor 王文坦康健邵雁李社锋郭华军陶玲朱文渊张谦
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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