A method for remediation of organic pollutant-heavy metal compound polluted 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: 2020-04-21
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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  • A method for remediation of organic pollutant-heavy metal compound polluted soil
  • A method for remediation of organic pollutant-heavy metal compound polluted soil
  • A method for remediation of organic pollutant-heavy metal compound polluted soil

Examples

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Embodiment 1

[0043] Example 1: Cu-DDT composite contaminated soil remediation method using Cu activated persulfate

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

[0045] The repair method of this embodiment includes the following steps:

[0046] (1) Spray a solution of sodium persulfate with a concentration of 10 mM into the compound contaminated soil, stir manually, and spray the sodium persulfate solution while stirring, so that the sodium persulfate and the soil are fully mixed, and the sodium persulfate solution applied is 50 kg / ton;

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

[0048] (3) Repeat for 10 days, take soil samples every ot...

Embodiment 2

[0052] Example 2: Cd-benzo(a)pyrene composite contaminated soil remediation method using Cd to activate persulfate

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

[0054] The method for remediating Cd-polycyclic aromatic hydrocarbon benzo(a)pyrene composite contaminated soil using Cd-activated persulfate in this embodiment includes the following steps:

[0055] (1) Spray the potassium persulfate solution with a concentration of 1mM into the composite contaminated soil, stir manually, spray the potassium persulfate solution while stirring, so that the potassium persulfate is fully mixed with the soil, and the concentration of the potassium persulfate solution applied 100 kg / ton;

[0056] (2) After applying pota...

Embodiment 3

[0063] Example 3: Method for remediation of Pb-trichlorobiphenyl composite contaminated soil using Pb to activate persulfate

[0064] In this embodiment, a laboratory is used to simulate composite contaminated soil. The non-polluted soil was collected from a vegetable planting base in Baiyun District, Guangzhou. It was a 30cm surface soil with a soil pH of 5.3. Pb ions and trichlorobiphenyl were artificially added at concentrations of 1200mg / kg and 1.2mg / kg, respectively.

[0065] The method for remediating Pb-trichlorobiphenyl composite contaminated soil using Pb-activated persulfate in this embodiment includes the following steps:

[0066] (1) Spray the 5mM ammonium persulfate solution into the composite contaminated soil, stir manually, spray the ammonium persulfate solution while stirring, so that the ammonium persulfate is fully mixed with the soil, and the applied ammonium persulfate solution concentration 75 kg / ton;

[0067] (2) After applying ammonium persulfate solution, the...

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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 restoration, and specifically relates to a method for restoration of organic pollutant-heavy metal compound contaminated soil. Background technique [0002] Organic matter and heavy metals are the two most important types of pollutants in the soil, with different properties. For a long time, domestic and foreign researches have been done on the individual pollution of these two types of pollutants and the composite pollution of different heavy metals, 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 differences in the chemical properties of organic matter and heavy metals, under compound pollution conditions, the interaction between pollutants makes pollution more complicated and uncertain, and polluti...

Claims

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Application Information

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Patent Type & AuthorityPatents(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
OwnerGUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI