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Remediation method of organic contaminant-heavy metal compound contaminated soil

A technology for organic pollutants and complex pollution, applied in the field of soil pollution remediation, can solve the problems of low efficiency of complex pollution remediation, difficult to meet the needs of remediation technology, and reduce remediation costs, so as to accelerate soil microbial metabolism, passivate heavy metals, reduce The effect of repair costs

Active Publication Date: 2017-05-10
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current repair technology is difficult to meet the demand under a single use condition
Therefore, the research and development of high-efficiency remediation technologies for compound polluted soils using the properties of soil pollutants can overcome the shortcomings of traditional remediation methods or the combination of two or more technologies that are inefficient in remediating compound pollution, and greatly reduce remediation costs. Efficient remediation of contaminated soil

Method used

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  • Remediation method of organic contaminant-heavy metal compound contaminated soil
  • Remediation method of organic contaminant-heavy metal compound contaminated soil
  • Remediation method of organic contaminant-heavy metal compound contaminated soil

Examples

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Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: Utilize the method for the remediation of Cu-DDT composite polluted soil of Cu activated persulfate

[0044] In this example, a laboratory is used to simulate composite polluted soil. The pollution-free soil was collected from a vegetable planting base in Baiyun District, Guangzhou City. It was the surface soil with a surface layer of 30 cm. The soil pH was 5.3. Cu ions and organochlorine pesticide DDT were artificially added at concentrations of 872 mg / kg and 5.6 mg / kg, respectively.

[0045] The repairing method of the present embodiment comprises the following steps:

[0046] (1) Spray and add the sodium persulfate solution that concentration is 10mM in compound polluted soil, manual stirring, while stirring, spray sodium persulfate solution, make sodium persulfate fully mix with soil, the sodium persulfate solution of applying is 50 kg / ton;

[0047] (2) After applying the sodium persulfate solution, the soil was stirred once a day for 5 minutes each ...

Embodiment 2

[0052] Embodiment 2: Utilize the method for the Cd-benzo (a) pyrene compound polluted soil remediation of Cd activated persulfate

[0053] In this example, a laboratory is used to simulate composite polluted soil. The pollution-free soil was collected from a vegetable planting base in Baiyun District, Guangzhou City. It was the surface soil with a surface layer of 30 cm. The pH of the soil was 5.3. Cd ions and benzo(a)pyrene were artificially added at concentrations of 15 mg / kg and 2.5 mg / kg, respectively.

[0054] The method for remediating the Cd-polycyclic aromatic hydrocarbon benzo (a) pyrene composite contaminated soil utilizing Cd to activate persulfate of the present embodiment may further comprise the steps:

[0055] (1) Spray and add the potassium persulfate solution that concentration is 1mM in compound polluted soil, manually stir, spray potassium persulfate solution while stirring, make potassium persulfate fully mix with soil, the potassium persulfate solution con...

Embodiment 3

[0063] Embodiment 3: Utilize the method for remediation of Pb-trichlorobiphenyl compound polluted soil of Pb activated persulfate

[0064] In this example, a laboratory is used to simulate composite polluted soil. The pollution-free soil was collected from a vegetable planting base in Baiyun District, Guangzhou City. It was the surface soil with a surface layer of 30 cm. The pH of the soil was 5.3.

[0065] The method for remediating the Pb-trichlorobiphenyl composite contaminated soil utilizing Pb activated persulfate of the present embodiment comprises the following steps:

[0066] (1) Spray and add the ammonium persulfate solution that concentration is 5mM in compound polluted soil, manually stir, spray ammonium persulfate solution while stirring, make ammonium persulfate fully mix with soil, the ammonium persulfate solution concentration of applying 75 kg / ton;

[0067] (2) After applying the ammonium persulfate solution, the soil was stirred once a day for 5 minutes each...

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Abstract

The invention discloses a remediation method of organic contaminant-heavy metal compound contaminated soil. The remediation method comprises the following steps: adding persulfate into organic matter-heavy metal compound contaminated soil, and on the basis of effective oxidative degradation of organic contaminant, further using iron-based biochar for passivating heavy metals after playing an activating effect so as to achieve effective remediation of the organic matter-heavy metal compound contaminated soil. Compared with the method for remedying contaminated soil with single contamination by using the biochar or the persulfate, the remediation method provided by the invention has the advantages as follows: two methods are combined for remedying organic matter-heavy metal compound contamination, the persulfate is used for oxidizing organic matters and can fully mineralize the organic matters; for heavy metal contaminated soil, the persulfate can oxidize the heavy metals, and reduces the pH of the soil to cause an increase in the concentration of effective-state metal; the biochar fixes the heavy metals to the surface through adsorption, so that the bioavailability of the heavy metals is reduced.

Description

technical field [0001] The invention belongs to the field of soil pollution remediation, and in particular relates to a method for remediating organic pollutant-heavy metal compound polluted soil. Background technique [0002] Organic matter and heavy metals are the two most important types of pollutants in soil, with different properties. For a long time, a lot of research has been done on the separate pollution of these two types of pollutants and the combined pollution of different heavy metals at home and abroad, and different remediation ideas and technologies have been proposed. However, the current soil pollution tends to be diversified and complicated, and the problem of organic matter-heavy metal compound pollution is particularly prominent. Due to the great difference in the chemical properties of organic matter and heavy metals, under the condition of compound pollution, the interaction between pollutants makes the pollution more complex and uncertain, and the ri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08B09C2101/00
Inventor 吴非刘承帅李芳柏陈曼佳童辉廖长忠
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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