Remediation method for organic matter contaminated soil

A technology of contaminated soil and remediation method, which is applied in the direction of restoration of contaminated soil, separation methods, chemical instruments and methods, etc. It can solve the problems of long biological treatment cycle, long time required, and large consumption of eluent, etc. Achieve the effect of reducing the cost of soil remediation, multiple times of repeated use, and good economic benefits

Active Publication Date: 2020-01-03
河南省环境保护科学研究院
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The landfill method is simple but expensive, and the pollutants still remain in the soil; the incineration method has complex equipment, high energy consumption, high cost, and secondary pollution of harmful gases and residual ash; adsorption, ultrasonic, microwave The purification effect is not ideal, the biological method has a long treatment cycle, and the treatment effect is not ideal; the leaching method is easy to operate and has high treatment efficiency, but there are problems of low miscibility between most organic substances and eluents, and the consumption of eluents is large , Disposal of leaching waste liquid, time-consuming waste liquid treatment, secondary pollution of soil by leaching agent, etc.
[0003] In existing soil remediation, when using th

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  • Remediation method for organic matter contaminated soil
  • Remediation method for organic matter contaminated soil
  • Remediation method for organic matter contaminated soil

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Example Embodiment

[0031] Example 1

[0032] According to the method for remediating soil contaminated by organic matter provided by the present invention, the petroleum contaminated soil in the oil field area of ​​Puyang City is remediated. Specific steps are as follows:

[0033] Step 1. Soil pretreatment: remove the impurities in the petroleum-contaminated soil, air dry, smash and screen, and mix and sample 6 samples for soil monitoring and analysis. The petroleum-contaminated soil has an organic matter content of 0.30% and a mineral composition of 100% Montmorillonite, the average value of various monitoring indicators: pH 8.1, total salt content 0.52%, petroleum products 1056.34mg / kg, Hg 0.051mg / kg, Cu 20.27mg / kg, Pb 18.78mg / kg, Cd 0.188mg / kg , As 8.43mg / kg, mixed evenly with soil dispersant at a mass ratio of 200:1. The soil dispersant is mixed with arsenic sandstone, opal light shale and carbon nanotubes at a mass ratio of 10:5:1 Become

[0034] Step two, continuous leaching of soil: pre-prepa...

Example Embodiment

[0042] Example 2

[0043] According to the method for remediating soil contaminated by organic matter provided by the present invention, the pesticide contaminated soil of abandoned vegetable plots in Zhongmou County, Zhengzhou City is remediated. Specific steps are as follows:

[0044] Step 1. Soil pretreatment: remove the impurities in the pesticide-contaminated soil, air dry, crush and screen, and mix and sample 6 samples for soil monitoring and analysis. The pesticide-contaminated soil has an organic content of 0.27% and a mineral composition of 89%. Montmorillonite, 11% kaolin, the average value of various monitoring indicators: pH 6.4, total salt content 0.44%, DDT residue 26.42mg / kg, omethoate residue 16.31mg / kg, high-efficiency chlorofluorocyanurate residue 30.57mg / kg, atrazine residue 29.84mg / kg, acetochlor residue 15.65mg / kg, heavy metal content does not exceed the standard, and the soil dispersant is mixed evenly according to the mass ratio of 200:2. The soil dispersan...

Example Embodiment

[0053] Example 3

[0054] According to the method for remediating soil contaminated by organic matter provided by the present invention, the polychlorinated biphenyl contaminated soil at a certain waste capacitor storage site in the Yangtze River Delta is reconditioned. Specific steps are as follows:

[0055] Step 1. Soil pretreatment: remove the impurities in the soil contaminated by PCBs, air dry, crush and screen, and sample 6 samples of multi-point mixing for soil monitoring and analysis. The organic matter content of the pesticide contaminated soil is 0.19%, and the mineral composition It is 88% kaolin, 12% others, the average value of various monitoring indicators: pH 6.4, total salt content 0.44%, PCB 68.65mg / kg, Hg4.23mg / kg, Cu 59.56mg / kg, Pb 82.47mg / kg, Cd 0.27mg / kg, As 48.18mg / kg, mixed with soil dispersant at a mass ratio of 200:3, the soil dispersant is made of arsenic sandstone, opal light shale and carbon nanotubes in mass ratio It is a mixture of 10:5:1;

[0056] S...

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Abstract

The invention provides a remediation method for organic matter contaminated soil. The remediation method comprises the following steps that 1, soil pretreatment; 2, continuous leaching of the soil; step 3, degradation of organic pollutants and recovery of heavy metals; and step 4, soil micro-ecological restoration. According to the invention, an elution method and a biological mud method are combined; firstly, a soil dispersing agent is mixed with the soil; soil aggregation and cementation in the leaching process are avoided; the leaching speed is increased by adopting a continuous leaching mode; meanwhile, the leaching effect is improved by compounding and combining the leaching agents; through the arrangement of tan electrostatic spinning composite filter felt, the cyclic utilization ofleacheate is realized; during soil micro-ecological restoration, an immobilized mixed degradation microbial inoculum is adopted, organic pollutants which are not eluted by leacheate and surfactants adsorbed in the soil can be degraded within 2-4 days by controlling the ventilation capacity and the stirring rate, the restoration time is short, the cost is low, the restored soil does not need to besubjected to subsequent treatment and can be directly sown, and the economic benefit is good.

Description

technical field [0001] The invention relates to the technical field of soil pollution remediation, in particular to a method for remediating organic-contaminated soil. Background technique [0002] The current treatment method for organic-contaminated soil is to excavate the soil and carry out follow-up treatment, including landfill, incineration, leaching, adsorption, ultrasonic, microwave, biological treatment, etc. The landfill method is simple but expensive, and the pollutants still remain in the soil; the incineration method has complex equipment, high energy consumption, high cost, and secondary pollution of harmful gases and residual ash; adsorption, ultrasonic, microwave The purification effect is not ideal, the biological method has a long treatment cycle, and the treatment effect is not ideal; the leaching method is easy to operate and has high treatment efficiency, but there are problems of low miscibility between most organic substances and eluents, and the consu...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/10B09C1/08B01D39/16
CPCB01D39/16B01D2239/0631B09C1/02B09C1/08B09C1/10
Inventor 路忻张清敏李祥华高贺文钟崇林杜学文李红亮
Owner 河南省环境保护科学研究院
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