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Hydrothermal alkali solidification treatment method for heavy metal contaminated soil

A technology for contaminated soil and solidification treatment, applied in the field of soil remediation, can solve problems such as poor soil remediation ability and complex process, and achieve the effects of easy acquisition, shortening the process flow, and improving efficiency

Pending Publication Date: 2020-06-09
中冶成都勘察研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] In order to solve the problems of complex process and poor soil remediation ability in the remediation of heavy metal polluted soil, the present invention provides a hydrothermal alkali solidification treatment method for heavy metal polluted soil

Method used

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  • Hydrothermal alkali solidification treatment method for heavy metal contaminated soil

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Comparison scheme
Effect test

Embodiment 1

[0048] The repairing method of the present embodiment comprises the steps:

[0049] (1) Send the polluted soil to the screening equipment for screening to remove the construction waste with a particle size larger than 50mm, and send the polluted soil after removing the construction waste to the crushing equipment for crushing to obtain fine-grained polluted soil with a particle size of ≤25mm;

[0050] (2) Add an alkaline curing agent to the fine-grained contaminated soil, the weight percentage of the alkaline curing agent and fine-grained soil is 10; medicinal soil;

[0051] (3) Put the dosing soil in the hydrothermal reaction device, close the hydrothermal reaction device, raise the temperature of the sealed hydrothermal reaction device to 60 ° C, seal and keep it for 1 hour, and obtain the repaired soil that meets the standard.

[0052] In this embodiment, the alkaline curing agent is lime.

Embodiment 2

[0054] The repairing method of the present embodiment comprises the steps:

[0055] (1) Send the polluted soil to the screening equipment for screening to remove the construction waste with a particle size larger than 50mm, and send the polluted soil after removing the construction waste to the crushing equipment for crushing to obtain fine-grained polluted soil with a particle size of ≤25mm;

[0056] (2) Add an alkaline solidifying agent to the fine-grained contaminated soil, the weight percentage of the alkaline solidifying agent and the fine-grained soil is 30; then add an appropriate amount of water and stir evenly to obtain a compound with a moisture content of 25%. medicinal soil;

[0057] (3) Put the dosing soil in the hydrothermal reaction device, close the hydrothermal reaction device, raise the temperature of the sealed hydrothermal reaction device to 180 ° C, seal and keep it for 15 hours, and obtain the repaired soil that meets the standard.

[0058] In this embod...

Embodiment 3

[0060] The repairing method of the present embodiment comprises the steps:

[0061] (1) Send the polluted soil to the screening equipment for screening to remove the construction waste with a particle size larger than 50mm, and send the polluted soil after removing the construction waste to the crushing equipment for crushing to obtain fine-grained polluted soil with a particle size of ≤25mm;

[0062] (2) Add an alkaline curing agent to the fine-grained polluted soil, the weight percentage of the alkaline curing agent and the fine-grained soil is 25; medicinal soil;

[0063] (3) Put the dosing soil in the hydrothermal reaction device, close the hydrothermal reaction device, raise the temperature of the sealed hydrothermal reaction device to 100°C, seal and keep it for 8 hours, and obtain the repaired and qualified soil.

[0064] In this embodiment, the alkaline curing agent is sodium bicarbonate.

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Abstract

The invention belongs to the technical field of soil remediation, discloses a hydrothermal alkali solidification treatment method for heavy metal contaminated soil, and aims to solve the problems of complex process and poor soil remediation capacity in heavy metal contaminated soil remediation. According to the method, physical remediation and chemical remediation in the prior art are organicallycombined together, the technological process can be shortened, and meanwhile the soil remediation efficiency can be improved; and an alkaline curing agent is easy to obtain and has the characteristicof low cost.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a hydrothermal alkali solidification treatment method for heavy metal-contaminated soil, which is particularly suitable for the up-to-standard remediation of soil contaminated by organic solvents, petroleum hydrocarbons, polycyclic aromatic hydrocarbons, benzene series and pesticides. Background technique [0002] With the rapid economic development, a large number of land resources are polluted, and the treatment of polluted soil is also one of the important tasks at present. In polluted soil, heavy metal pollution is particularly serious. [0003] Heavy metal pollution comes from a wide range of sources, mainly from human production and living activities, including mining, smelting, metal processing, chemical industry, waste battery treatment, electronics, tanning and dyestuffs and other industrial wastes, as well as vehicle exhaust emissions, pesticides an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/06
CPCB09C1/06B09C1/08
Inventor 李钦韬杨建彭涛何剑奇
Owner 中冶成都勘察研究总院有限公司
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