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A microbial treatment method for lead and cadmium polluted soil foundation

A microbial treatment and soil foundation technology, applied in the restoration of polluted soil, etc., can solve the problems that the soil mechanical properties of the site do not play a role, and cannot take into account the requirements of environmental treatment and foundation reinforcement at the same time, so as to achieve short construction period and durable The effect of strong force and uniform distribution of bacteria

Active Publication Date: 2021-11-30
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical issues: At present, bioremediation technology only realizes the stabilization treatment of pollutants, and has not yet played a role in improving the mechanical properties of the site soil, and cannot take into account the requirements of environmental treatment and foundation reinforcement at the same time

Method used

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  • A microbial treatment method for lead and cadmium polluted soil foundation

Examples

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Effect test

Embodiment 1

[0021] In this example, a kind of microbial treatment method of lead, cadmium contaminated soil foundation is used for processing lead, cadmium ion polluted powder soil foundation, and this method comprises the following steps:

[0022] a. Extract soil samples from stratum 1 to be treated for TCLP toxicity leaching test. The leached amounts of lead and cadmium ions in stratum 1 to be treated are measured to be 10.2 mg / L and 8.8 mg / L respectively. Drill holes and lay out the grouting pipe 2. The grouting holes for placing the grouting pipe 2 are arranged in a plum blossom shape on the plane, and the hole distance is 1.5m;

[0023] b. prepare microbial growth-promoting liquid 3, use grouting pump 4 to inject microbial growth-promoting liquid 3 through grouting pipe 2 in the stratum 1 to be treated to improve the resistance of microorganisms to environmental toxicity, and then promote their mass reproduction, the microbial growth-promoting liquid 3 The pH is 7.0, the dissolved ox...

Embodiment 2

[0028] In this example, a microbial treatment method for lead and cadmium contaminated soil foundations is used to treat lead and cadmium ion-contaminated clay foundations. The method includes the following steps:

[0029] a. Extract soil samples from the stratum 1 to be treated for TCLP toxicity leaching test. The leached amounts of lead and cadmium ions in the untreated foundation are measured to be 8.6mg / L and 7.5mg / L respectively, and then drill holes on the stratum 1 to be treated And lay out the grouting pipe 2, the grouting holes where the grouting pipe 2 is placed are arranged in a triangle on the plane, and the hole distance is 1.5m;

[0030] b. prepare microbial growth-promoting liquid 3, use grouting pump 4 to inject microbial growth-promoting liquid 3 through grouting pipe 2 in the stratum 1 to be treated to improve the resistance of microorganisms to environmental toxicity, and then promote their mass reproduction, the microbial growth-promoting liquid 3 The pH is...

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Abstract

A microbial treatment method for lead- and cadmium-contaminated soil foundations, which can successively realize environmental restoration and reinforcement of lead- and cadmium-contaminated soil foundations within one construction period, and is characterized in that the steps of the method are as follows: a. The leaching amount of lead and cadmium ions in the soil, and then drill holes on the stratum 1 to be treated and arrange the grouting pipe 2; b. prepare the microbial growth-promoting liquid 3, and pour it into the stratum 1 to be treated through the grouting pump 4 every 5 days Inject the microbial growth-promoting liquid 3; c. detect the urease activity of the soil in the stratum 1 to be treated, and stop injecting the microbial growth-promoting liquid 3 into the stratum 1 to be treated when the urease activity is greater than 80 mg / g; d. prepare the cementing solution 5, Inject the cementing solution 5 into the stratum 1 to be treated through the grouting pump 4 every 2 days; e. After the site reaches the predetermined number of grouting times, check the strength of the foundation and the leaching amount of lead and cadmium ions in the soil, and pull out after meeting the requirements For all grouting pipes 2, if the requirements are not met, repeat step d until the requirements are met.

Description

technical field [0001] The invention relates to a microbial treatment method for soil foundation polluted by lead and cadmium, and belongs to the technical field of foundation treatment. Background technique [0002] In environmental pollution, heavy metal pollution in soil has attracted wide attention from the society due to its characteristics of great harm, long duration, and strong concealment. Soil heavy metal pollution will cause changes in the composition, structure and function of the soil, inhibit microbial activities, gradually accumulate harmful substances or decomposition products in the soil, and be indirectly absorbed by the human body through the food chain, endangering human health. When the human blood lead is greater than 1.5×10 -4 When g / L, can cause symptoms such as hepatitis, nephritis and neurosis, and excessive cadmium can cause great harm to kidney. In addition, after heavy metal elements invade the soil, it will cause the colloid between the partic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/10B09C2101/00
Inventor 黄容聘邵光辉刘鹏
Owner NANJING FORESTRY UNIV
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