Attapulgite-based technique for in-situ remediation of heavy-metal contaminated soil

A technology of polluted soil and in-situ remediation, applied in the field of resources and environment, to achieve the effect of low cost, easy implementation and reduction of pollution degree

Inactive Publication Date: 2012-05-02
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

Each method has its advantages and disadvantages: using engineering measures to control heavy metal-contaminated soil has the advantages of thorough and stable effects, but the amount of engineering is large, the cost of treatment is high, and it is easy to cause soil fertility to weaken
[0007]Although the resource reserves of attapulgite in my country are large, due to the late discovery, its development and utilization level is low, and the national non-metallic mineral processing industry base is relatively Weak, the attapulgite products that can be produced are quite small compared with other countries, so that the application of this economically significant mineral deposit is limited to general fillers, and even exported cheaply in the form of raw soil, resulting in resources waste of

Method used

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  • Attapulgite-based technique for in-situ remediation of heavy-metal contaminated soil
  • Attapulgite-based technique for in-situ remediation of heavy-metal contaminated soil
  • Attapulgite-based technique for in-situ remediation of heavy-metal contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0022] In this example, an indoor culture experiment was used, and attapulgite was added to the heavy metal-contaminated soil under constant temperature and humidity.

[0023] The culture vessel used in the test is a 250ml polyethylene plastic bottle. The heavy metal-contaminated soil used was: 600 g heavy metal-contaminated soil (air-dried soil) in Guixi, Jiangxi Province, which passed through a 2mm sieve.

[0024] The heavy metal soil used in the experiment was evenly divided into three equal parts for bottling, and different contents of attapulgite were added to each bottle, and the addition amount did not exceed 8% wt. 70% wt, placed in an incubator, incubated at a constant temperature of 25°C for 1 month, leached with 0.1M HCl, and calculated the content of available heavy metals in the treated soil. The content of available heavy metals in the soil applied to attapulgite was significantly reduced, of which the 8%wt treatment had the best effect, and the content of avail...

Embodiment 2

[0026] In this example, a pot experiment was used. Under greenhouse conditions, attapulgite was added to the soil contaminated with heavy metals, and ryegrass was planted.

[0027] Different contents of attapulgite were added per kilogram of soil, and the proportion of the addition amount did not exceed 8%wt. The contaminated soil was added to attapulgite and cultivated for two weeks, and then basal fertilizer was applied. The water content of the soil is kept at 60%wt-70%wt of the field capacity by watering by weighing method. Two crops of ryegrass were harvested, and the growth period of both crops was 50 days. Compared with the control without addition, when the addition amount was 8% wt, the above-ground biomass of the first crop increased by 184% wt, and the biomass of the second crop increased by 159% wt. Table 2 shows the reduction efficiency of attapulgite with the addition of 4% heavy metals in plants and soil.

[0028] Table 2

[0029] heavy metal % ...

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Abstract

The invention discloses an attapulgite-based technique for the remediation of heavy-metal contaminated soil. The technique comprises the following steps: adding attapulgite with the ratio thereof being lower than or equal to 8% and the particle size thereof being 100 meshes to the heavy-metal contaminated soil; and mixing. The technique can effectively fix various heavy metals, particularly Cu, Zn and Cd, in the soil, prevent the heavy metals from being migrated into plants from the soil and fundamentally prevent the heavy metals from entering the food chain; the technique of the invention has the advantages of simple operation and low soil management cost, avoids the secondary pollution and is capable of reducing the pollution level and reducing the absorption of heavy metals into plantswithin a short time. Therefore, the technique constitutes a safe and effective method for the remediation of heavy-metal contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to the in-situ restoration technology of heavy metal polluted soil. Background technique [0002] With the rapid growth of industry and agriculture, the problem of soil heavy metal pollution is becoming more and more serious. According to the report of the State Environmental Protection Administration, the area of ​​cultivated land polluted by heavy metals such as Cd, As, Cr, and Pb in my country is nearly 20 million hm 2 , accounting for about 1 / 5 of the total cultivated land area. Due to the characteristics of universality, concealment, and long-term nature of heavy metal pollution, the treatment of heavy metal-contaminated soil is still a major problem in the world today. On the one hand, soil heavy metal pollution will endanger the health of humans and animals by polluting the food chain or the atmosphere, causing cancer or chronic diseases; on t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 章钢娅孙波林云青
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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