Passivation remediation agent for As contaminated soil and preparation method of passivation remediation agent

A technology of polluted soil and remediation agent, applied in the field of soil remediation, can solve the problems of complex composition and high production cost of passivation remediation agent, and achieve the effects of large-scale production, low production cost and long-term stable performance

Inactive Publication Date: 2019-08-20
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composition of the passivation repair agent is complex and the production cost is high

Method used

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  • Passivation remediation agent for As contaminated soil and preparation method of passivation remediation agent
  • Passivation remediation agent for As contaminated soil and preparation method of passivation remediation agent

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Embodiment 2

[0026] The passivation restoration agent of this embodiment includes the following components in parts by weight: 9 parts of fly ash, 3 parts of ammoniated humic acid, and 2 parts of ferrous sulfate. The preparation process of the passivation restoration agent of the present embodiment refers to the preparation process of the passivation restoration agent in the embodiment 1 of the passivation restoration agent of As polluted soil, the difference lies in the addition amount of ammonium bicarbonate in 100 parts of weathered coal in step 1) for 23 servings.

Embodiment 3

[0028] The passivation restoration agent of this embodiment includes the following components in parts by weight: 10 parts of fly ash, 4 parts of ammoniated humic acid, and 1 part of ferrous sulfate. The preparation process of the passivation restoration agent of the present embodiment is basically the same as the preparation process of the passivation restoration agent in the embodiment 1 of the passivation restoration agent of As polluted soil, the difference is that the ammonium bicarbonate in 100 parts of weathered coal in step 1) Addition amount is 25 parts.

[0029] The embodiment of the preparation method of As polluted soil passive remediation agent

[0030] The preparation method of the passivation restoration agent of the present embodiment comprises the following steps: 1) in parts by weight, add 20 parts of ammonium bicarbonate to 100 parts of weathered coal, mix well, and obtain ammoniated humic acid; 2) mix 8 parts Fly ash and 5 parts of ammoniated humic acid we...

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Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to a passivation remediation agent for As contaminated soil and a preparation method of the passivation remediation agent. The passivation remediation agent for the As contaminated soil comprises the following components, in parts by weight: 8-10 parts of fly ash, 3-5 parts of ammoniated humic acid, and 1-3parts of ferrous sulfate. According to the passivation remediation agent provided by the invention, the ammoniated humic acid and heavy metal arsenic can be subjected to chelation complexation, ion exchange, redox and adsorption, so that a storage form of the heavy metal arsenic in the soil is changed, the heavy metal arsenic is passivated, the mobility and bioavailability of the heavy metal arsenic in the soil are reduced, and the purpose of passivation stabilization is achieved.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a passivation remediation agent for As polluted soil and a preparation method thereof. Background technique [0002] At present, the remediation of arsenic-contaminated soil in my country is mainly based on the passivation and stabilization of heavy metals in soil (Solidification / Stabilization, referred to as S / S) in chemical remediation. This method is mainly to add curing agent materials such as lime, cement, steel slag and mud polymer to the soil, and fix arsenic in the soil through adsorption and precipitation, reducing its activity and bioavailability. However, a large amount of curing agent is required for repairing. Traditional curing agents cause serious damage to the soil structure and are not suitable for repairing large areas of arsenic-contaminated soil. [0003] Humic acid is an important part of soil organic matter, which can improve the water,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K109/00
CPCC09K17/40C09K2109/00
Inventor 黄占斌王平王璐陆中桂
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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