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Passivating agent used for arsenic polluted soil restoration, arsenic polluted soil restoration method, and application of passivating agent

A soil remediation and arsenic pollution technology, applied in the restoration of polluted soil, chemical instruments and methods, applications, etc., can solve the problems of secondary pollution and prominent environmental risks, low remediation efficiency of arsenic-contaminated soil, and expensive chemicals. The effect of reducing the cost of project implementation, wide application and reducing consumption

Inactive Publication Date: 2017-01-18
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems that the existing arsenic-contaminated soil solidification and stabilization agents are expensive and pollute the environment, resulting in low efficiency, high cost, secondary pollution and environmental risks of arsenic-contaminated soil solidification and stabilization restoration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a passivating agent for remediation of arsenic-contaminated soil, including calcium oxide, iron-containing reagent, calcium sulfate / calcium sulfate hydrate, and general-purpose Portland cement, the calcium oxide, iron-containing reagent , calcium sulfate / calcium sulfate hydrate, and general-purpose Portland cement are 0.5-5%, 0.5-5%, 0.5-5% and 1-10% of the mass of arsenic-contaminated soil to be remediated, respectively.

[0024] Wherein, 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, chlorine One or more of ferric chloride / ferric chloride hydrate, ferric oxide, polyferric chloride, and polyferrous sulfate. The general-purpose Portland cement is ordinary Portland cement, slag Portland cement, pozzolanic Portland cement, fly ash Portland cement or composite Portland cement.

[0025] Cal...

Embodiment 2

[0033] In this example, soil remediation was carried out on an arsenic-contaminated site left over from an industrial relocation in Guangzhou. The average arsenic content in the soil of the site was detected to be 600 mg / kg. The arsenic-contaminated soil remediation method of the present invention was adopted, and the specific process was as follows:

[0034] (1) Add calcium oxide powder to the arsenic-contaminated soil and mix evenly with a stirring device. The amount of calcium oxide added is 1% of the mass of the arsenic-contaminated soil.

[0035] (2) Add ferrous sulfate heptahydrate and calcium sulfate to the soil in the form of powder, and make it fully mixed by stirring equipment. Ferrous sulfate heptahydrate is 1% of the mass of arsenic-contaminated soil, and the amount of calcium sulfate added is the mass of arsenic-contaminated soil. 1%.

[0036] (3) Add the composite Portland cement into the soil in the form of powder, and make it fully mixed by mixing equipment. Th...

Embodiment 3

[0040]In this example, soil remediation was carried out on an arsenic-contaminated site left over from an industrial relocation in Hubei. The average arsenic content in the soil of the site was detected to be 2000 mg / kg. The arsenic-contaminated soil remediation method of the present invention was adopted, and the specific process was as follows:

[0041] (1) Add calcium oxide powder to the arsenic-contaminated soil and mix evenly with a stirring device. The amount of calcium oxide added is 5% of the mass of the arsenic-contaminated soil.

[0042] (2) Add ferric chloride hexahydrate and calcium sulfate to the soil in the form of powder, and make it fully mixed by stirring equipment. Ferric chloride hexahydrate is 5% of the mass of arsenic-contaminated soil, and the amount of calcium sulfate added is the mass of arsenic-contaminated soil. 3%.

[0043] (3) Add the composite Portland cement into the soil in the form of powder, and mix it thoroughly by mixing equipment. The compos...

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PUM

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Abstract

The invention provides a passivating agent used for arsenic polluted soil restoration. The passivating agent comprises calcium oxide, an iron-containing reagent and calcium sulfate / calcium sulfate hydrate which are separately stored, and also comprises general purpose portland cement, calcium oxide accounts for 0.5-5% of the mass of arsenic polluted soil to be restored, the iron-containing reagent accounts for 0.5-5% of the mass of the arsenic polluted soil to be restored, the calcium sulfate / calcium sulfate hydrate accounts for 0.5-5% of the mass of the arsenic polluted soil to be restored, and the general purpose portland cement accounts for 1-10% of the mass of the arsenic polluted soil to be restored. Reagent raw materials adopted by the passivating agent used for arsenic polluted soil restoration have wide sources and low cost, the calcium sulfate / calcium sulfate hydrate and the iron-containing reagent have synergism, and addition of the calcium sulfate / calcium sulfate hydrate substantially reduces the use amount of the iron-containing reagent and reduces the engineering enforcing cost. An arsenic polluted soil restoration method provided by the invention is simple, is easy to implement, is insensitive to the type of soil, can be used for most of arsenic polluted soils, and has the advantages of wide application range, high arsenic polluted soil restoration efficiency, obvious restoration effect and no secondary pollution.

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 arsenic-contaminated soil and a method for remediation of arsenic-contaminated soil. Background technique [0002] With the development of my country's industry and agriculture and the acceleration of urbanization, as well as the adjustment of my country's industrial structure and the acceleration of urbanization, large and medium-sized cities across the country have implemented the policy of "retreating from two to three" and "retreating from cities and entering parks". A large number of polluting enterprises involved in chemical industry, metallurgy, petroleum, transportation, light industry and other industries have been relocated or closed down successively. Arsenic is widely used in many industries, and a large amount of it remains in the soil through the processes of mining, proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/10B09C1/08
CPCC09K17/10B09C1/08
Inventor 王文坦邵雁康健李社锋郭华军陈堃刘子豪宋自新
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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