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A chemical elution-phytocombined method for remediating PCB-contaminated soil

A polychlorinated biphenyl and contaminated soil technology, applied in the field of contaminated soil remediation, can solve the problems of limited phytoremediation efficiency, low bioavailability, long remediation period, etc., achieve a wide range of soil types, reduce the risk of secondary pollution, and ecological less toxic effect

Active Publication Date: 2018-02-23
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] According to my country's current national conditions for land demand, the use of phytoremediation technology to treat organically polluted soil has the characteristics of simple operation, low cost, and no secondary pollution, but the treatment effect of phytoremediation technology on organic pollutants is usually limited by its strong hydrophobicity. Effects lead to very low bioavailability which limits phytoremediation efficiency and relatively long remediation period

Method used

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  • A chemical elution-phytocombined method for remediating PCB-contaminated soil

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Effect test

Embodiment 1

[0034] After PCB pollution concentration is 2.5mg / kg polluted soil 1kg (dry soil) passes through 60 mesh sieves, regulates soil water content to be 40% of field water holding capacity, then the alfalfa seeds of vernalization, dew are evenly sown in In the soil, the alfalfa plants were grown for two weeks and then the seedlings were thinned out. Polysorbate-80 (Tween80) and ethyl lactate were used to prepare the eluent according to the mass ratio of 2.5:1, that is, the concentrations of Tween80 and ethyl lactate were 250mg / L and 100mg respectively / L. After the alfalfa plants grow for two weeks, apply 200ml of eluent to the soil every 5 days by spraying, strictly control the water content of the soil, and avoid the occurrence of infiltration. 80% relative humidity, daytime) / 18±1°C (no light, 80% relative humidity, night) conditions. The test of cultivating alfalfa continued for 90 days, and samples were taken at 30 days, 60 days and 90 days respectively, and the concentration ...

Embodiment 2

[0036]After 1 kg of contaminated soil (dry soil) with a concentration of PCB pollution of 10 mg / kg passes through a 60-mesh sieve, the soil water content is adjusted to 60% of the field water holding capacity, and then the germination and white alfalfa seeds are evenly sown on the soil In the method, the alfalfa plants were grown for two weeks and then the seedlings were thinned out. Tween80 and ethyl lactate were used to prepare the eluent at a mass ratio of 5:1, that is, the concentrations of Tween80 and ethyl lactate were 500 mg / L and 100 mg / L, respectively. After the alfalfa plants grow for two weeks, apply 200ml of eluent to the soil every 8 days by spraying, strictly control the soil water content, and avoid the occurrence of infiltration. 80% relative humidity, daytime) / 18±1°C (no light, 80% relative humidity, night) conditions. The test of cultivating alfalfa continued for 90 days, and samples were taken at 30 days, 60 days and 90 days respectively, and the concentrati...

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Abstract

The invention provides a method for chemical elution-plant combined repairing polychlorinated biphenyl contaminated soil, which belongs to the field of contaminated soil restoration, and comprises the following steps: taking the contaminated soil to be repaired, grinding and pulverizing, passing through a 60-mesh sieve, and adjusting the sieve The water content of the final soil should be adjusted to keep the soil water content at 40% to 60% of its field water capacity, and it will be used for later use; the alfalfa seeds that have been treated with germination will be evenly spread in the spare soil for cultivation, and the alfalfa plants will grow for two weeks. Thinning it afterward, the alfalfa plant cultivation period is 90 days; Begin to spray eluent in soil from thinning, spray once every 5 days to 8 days, thereby repair polychlorinated biphenyls in soil, and prior art Compared with the present invention, the operation is simple and the treatment effect is good, and in-situ restoration can be realized. The restoration process has little impact on the original environment, and a wide range of soil types are used. When used in actual environmental restoration, the risk of secondary pollution is greatly reduced, which is beneficial to subsequent soil restoration. Recycling.

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, in particular to a chemical elution-plant combined method for remediating polychlorinated biphenyl contaminated soil. Background technique [0002] Polychlorinated biphenyls (PCBs), is a kind of artificially synthesized environmental heterogeneous organic substances, which is a kind of chloride formed by replacing the hydrogen atoms on the biphenyl ring with 1 to 10 chlorines. 209 homologues. PCBs have good chemical stability, thermal stability, flame retardancy, thermal conductivity, insulation and high viscosity, and are widely used in industry. For a long time, a large number of polychlorinated biphenyls have been used as impregnating liquids for transformers and capacitors, pressure transmission media for hydraulic systems, heat transfer media for heat transfer systems, and are also used to make adhesives, flame retardants, printing inks, dyes, etc. Additives for plastics, resin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/02
Inventor 陈涛孙成勋姚志忠张轶珠
Owner STATE GRID CORP OF CHINA
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