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Remediation method for chrome-polluted soil in coal mine collapse region

A technology of chromium-contaminated soil and remediation method is applied in the field of chromium-contaminated soil remediation in coal mine subsidence areas, which can solve the problems of soil sample collection and remediation without considering spatial differences, not fully considering the spatial differences of soil chromium content, etc. Even soil fertility, water retention capacity and nutrient supply capacity are excellent, and the effect of reducing mobility

Inactive Publication Date: 2017-05-03
PINGDINGSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When collecting soil samples, due to the large difference in soil chromium content, the traditional "S" or "diagonal" method is difficult to reflect the actual situation of soil chromium content. At present, when remediating chromium-contaminated soil, soil Spatial differences in chromium content have not been considered in the collection and restoration of soil samples, and there are certain deficiencies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for remediating chromium-contaminated soil in a coal mine subsidence area, comprising the following steps:

[0024] (1) Soil samples were collected using the grid multi-point sampling method, and the collection depth was 10cm;

[0025] (2) Measure the chromium content of the collected soil samples, and divide the soil into five grades according to the soil chromium content measurement results. The soil chromium content of the first grade soil is less than 365mg / kg, and the soil chromium content of the second grade soil Not less than 365 mg / kg and less than 449 mg / kg, the soil chromium content of the third-grade soil is not less than 449 mg / kg and lower than 578 mg / kg, and the soil chromium content of the fourth-grade soil is not less than 578 mg / kg And less than 712mg / kg, the soil chromium content of the fifth grade soil is not less than 712mg / kg;

[0026] (3) According to the weight ratio of 1:2:1, take coconut peat, diatomaceous earth and bentonite and mix t...

Embodiment 2

[0032] A method for remediating chromium-contaminated soil in a coal mine subsidence area, comprising the following steps:

[0033] (1) Soil samples were collected using the grid multi-point sampling method, and the collection depth was 14cm;

[0034] (2) Measure the chromium content of the collected soil samples, and divide the soil into five grades according to the soil chromium content measurement results. The soil chromium content of the first grade soil is less than 365mg / kg, and the soil chromium content of the second grade soil Not less than 365 mg / kg and less than 449 mg / kg, the soil chromium content of the third-grade soil is not less than 449 mg / kg and lower than 578 mg / kg, and the soil chromium content of the fourth-grade soil is not less than 578 mg / kg And less than 712mg / kg, the soil chromium content of the fifth grade soil is not less than 712mg / kg;

[0035] (3) According to the weight ratio of 1:2:1, take coconut peat, diatomaceous earth and bentonite and mix t...

Embodiment 3

[0041] A method for remediating chromium-contaminated soil in a coal mine subsidence area, comprising the following steps:

[0042] (1) Soil samples were collected using the grid multi-point sampling method, and the collection depth was 18cm;

[0043] (2) Measure the chromium content of the collected soil samples, and divide the soil into five grades according to the soil chromium content measurement results. The soil chromium content of the first grade soil is less than 365mg / kg, and the soil chromium content of the second grade soil Not less than 365 mg / kg and less than 449 mg / kg, the soil chromium content of the third-grade soil is not less than 449 mg / kg and lower than 578 mg / kg, and the soil chromium content of the fourth-grade soil is not less than 578 mg / kg And less than 712mg / kg, the soil chromium content of the fifth grade soil is not less than 712mg / kg;

[0044] (3) According to the weight ratio of 1:2:1, take coconut peat, diatomaceous earth and bentonite and mix t...

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Abstract

The invention provides a remediation method for chrome-polluted soil in a coal mine collapse region. Firstly, soil sample collecting is conducted through a grid multi-point method, then the chrome content of collected soil samples is measured, the soil is graded according to soil chrome content measuring results, then the 10-18 cm thick part of the surface layer of the chrome-polluted soil is turned over, a microbial agent and soil improvement particles of corresponding quantities are applied according to the determined soil grades, finally the chrome-polluted soil is irrigated, the irrigation depth is 20 cm or over, the relative humidity of soil reaches 85% or over and is maintained for 10-20 days, and the microbial agent is composed of adsorption carriers and effective viable bacteria adsorbed on the carriers. The method is high in remediation efficiency, low in cost and free of secondary pollution, measures are adjusted to local conditions, the chrome-polluted soil in the coal mine collapse region can be remedied more precisely and rapidly, chrome is effectively prevented from migrating in the soil, nutrient elements are provided for the soil for a long time in the soil remediation process, and the available value of the soil is increased.

Description

technical field [0001] The invention relates to the technical field of soil remediation in coal mine subsidence areas, in particular to a method for remediation of chromium-contaminated soil in coal mine subsidence areas. Background technique [0002] Chromium pollution in coal mine subsidence areas is serious. Chromium-contaminated soil in coal mine subsidence areas in my country is usually used for agricultural use after restoration. If the restoration is not complete, chromium enters the plants through the root system, resulting in poor plant growth, harm to plants, and even death of plants. Chromium can accumulate in plants, and when plants with chromium accumulation exceeding normal levels enter the food chain, it will affect the health of animals and even humans. [0003] At present, most of my country's chromium-contaminated land has not been treated, causing huge hidden dangers to the environment. Chromium pollution in soil is concealed, lagging and long-term, causi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/00
CPCB09C1/10B09C1/00B09C2101/00
Inventor 耿鹏旭王卓理李鹏王磊刘金锤
Owner PINGDINGSHAN UNIVERSITY
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