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Soil smoldering remediation method for heavy metal co-contaminated soil

A remediation method and composite pollution technology, applied in the field of remediation of heavy metal polluted soil, can solve the problems of height, need to be as thin as two centimeters or less, inconvenient to operate, limited in effect, etc., and achieve soil fertility improvement and cation exchange. The effect of enhanced capacity and enhanced water retention capacity

Active Publication Date: 2014-05-28
SHAOGUAN TAOLIN GREEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method takes a long time and has limited effects. It can only deal with two heavy metals recorded in cadmium and copper, and the invention has high requirements for the crushing of straw, which needs to be as fine as two centimeters or less. Therefore, the technical operation of the invention is not very convenient

Method used

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  • Soil smoldering remediation method for heavy metal co-contaminated soil
  • Soil smoldering remediation method for heavy metal co-contaminated soil
  • Soil smoldering remediation method for heavy metal co-contaminated soil

Examples

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Effect test

Embodiment 1

[0030] Example 1 After treatment with the technology of the present invention, the DTPA effective state leaching effect of contaminated soil before and after fumigation (Table 1)

[0031] (1) Binding of rice straw and pretreatment of contaminated soil;

[0032] The rice straws with a moisture content of about 5% are bound into straw bundles with a uniform size and a length of about 30cm.

[0033] 20cm of soil on the surface of farmland polluted by complex heavy metals near a lead-zinc mine in Lechang, Guangdong, was sun-dried until the soil had a water content of 10%.

[0034] (2) The soil to be treated is covered with rice straw

[0035] Prepare the soil treated in (1) and the bound rice straws respectively. The mulching method in which the rice straw and the soil layer are overlapped and stacked in a circular shape. First put a certain amount of bound rice straws on the bottom, then cover a layer of larger clods on top of the rice straws, put a certain...

Embodiment 2

[0042] Before and after the soil was treated with the technology of the present invention, Tessier (Tessier et al., 1979) five-stage continuous extraction method was used to carry out multi-stage extraction experiments. Tessier five-stage extraction is sequentially from the effective state to the carbonate binding state to the iron and manganese oxidation state to the organic state to the residue state. The test results show that the chemical forms of heavy metals in the soil treated with the technology of the present invention have changed significantly compared with those before treatment, three relatively unstable metals: exchangeable state, carbonate binding state and iron and manganese oxidation state The percentage of the sum of the forms in all five-level forms is reduced, such as lead Pb ( figure 1 ), zinc Zn ( figure 2 ), copper Cu ( image 3 ), Cadmium Cd ( Figure 4 ) decreased from 59.75%, 64.13%, 16.50% and 64.16% before treatment to 48.67%, 56.42%, 2.25% and ...

Embodiment 3

[0043] Example 3 Field experiment in Lechang, Guangdong, measuring the biomass (Table 2) and heavy metal content (Table 3) of the aerial parts of vegetables harvested in the field

[0044] From May to August 2012, in the farmland near a lead-zinc mine in Lechang, Guangdong, a random block method was used to set up 6 blocks and 48 small sample squares of 2m × 2m, with a total area of ​​about 300 square meters. . In each block group, 24 small sample squares of fumigated soil were randomly determined by drawing lots. The 24 sample squares were treated with the technology of the present invention and compared with the other 24 small sample squares without fumigation, and then four small sample squares were planted. Plant local vegetables that can be grown all year round, namely southern sweet bamboo mustard, four-season cabbage, bantam cabbage and cabbage.

[0045] During the growth period of the four kinds of vegetables, NPK compound fertilizer was regularly applied twice, a...

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Abstract

The invention belongs to the technical field of remediation of heavy metal contaminated soil, and particularly relates to a soil smoldering technology for treatment and remediation of heavy metal co-contaminated soil. The soil smoldering remediation method mainly comprises the following steps: plant straws are covered with soil to form a covered body; the outer layer is a soil layer, and the straws or a mixture of straws and soil are arranged inside; the inside is kept in an anaerobic condition, and the soil smoldering treatment is then carried out. Through solidification, absorption, chelation, complexation and other various reactions, the heavy metal co-contaminated soil treated by applying the technology provided by the invention achieves a reduced proportion of chemical forms which can easily migrate and diffuse to the environment, and an increased proportion of chemical forms which are difficult to release to the environment. Therefore, environmental and ecological risks from heave metals are reduced. The technology provided by the invention can simultaneously fix multiple heave metals, reduce the heave metal absorption and accumulation by plants, effectively kill various pathogenic bacteria in soil and increase the biomass of crops, and is a simple, high-efficient, easy-to-operate and low-cost in-situ remediation technology for heavy metal co-contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal polluted soil, and more particularly relates to a method for fumigation and remediation of heavy metal composite polluted soil. Background technique [0002] Soil pollution affects human health directly or indirectly, resulting in unacceptable environmental risks, especially heavy metal contamination of soil. Heavy metals are extremely stable in the environment, not only not biodegradable, but also thermally degradable, so they can easily accumulate to toxic concentrations. Moreover, the long-term accumulation of heavy metals in the soil environment will seriously affect the food chain, plants and soil microbial processes. The problem of heavy metal pollution in the mining wasteland and the soil around the mining area is particularly serious. The mining wasteland is oxidized by metal sulfides and continuously releases new acidic substances over time. The solubility of heavy met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 束文圣牛莉芹周文华蒋华
Owner SHAOGUAN TAOLIN GREEN TECH
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