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A kind of remediation method of organic matter polluted soil

A technology of polluted soil and remediation method, which is applied in the direction of restoration of contaminated soil, separation methods, chemical instruments and methods, etc., can solve the problems of large consumption of eluent, secondary pollution of soil, and long time required to achieve Accelerate the rinsing rate, improve the rinsing efficiency, and promote the effect of uniform distribution

Active Publication Date: 2021-07-30
河南省环境保护科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 the leaching method to remove organic pollutants in the soil, the leaching solution is first mixed with the soil, and then stirred for a certain period of time to allow the two to fully react before standing still, and finally the leaching solution is separated. It takes a long time, because the separation of the eluent requires a large amount of eluent at one time, and a considerable part of the eluent components in the eluent waste liquid are not combined with the pollutants, resulting in waste of reagents, and the eluent waste liquid The follow-up treatment is also relatively difficult, and it needs to be sent to the relevant sewage treatment plant or further degrade or adsorb the organic pollutants in the leaching waste liquid, and then treat the heavy metals

Method used

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  • A kind of remediation method of organic matter polluted soil
  • A kind of remediation method of organic matter polluted soil
  • A kind of remediation method of organic matter polluted soil

Examples

Experimental program
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Effect test

Embodiment 1

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

[0033] Step 1. Soil pretreatment: remove the sundries in the oil-contaminated soil, naturally air-dry, pulverize and sieve, and mix and sample 6 parts at multiple points for soil monitoring and analysis. The organic matter content of the oil-contaminated soil is 0.30%, and the mineral composition is 100%. Montmorillonite, the average value of each monitoring index: pH 8.1, total salt content 0.52%, petroleum 1056.34mg / kg, Hg 0.051mg / kg, Cu 20.27mg / kg, Pb 18.78mg / kg, Cd 0.188mg / kg , As 8.43mg / kg, evenly mixed with soil dispersant in a mass ratio of 200:1, the soil dispersant is mixed by arsenic sandstone, opal light shale and carbon nanotubes in a mass ratio of 10:5:1 made;

[0034] Step 2, soil continuous leaching: pre-prepared non-anionic mixed sur...

Embodiment 2

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

[0044] Step 1. Soil pretreatment: remove the sundries in the pesticide-contaminated soil, naturally air-dry, pulverize and sieve, and mix and sample 6 parts at multiple points for soil monitoring and analysis. The organic matter content of the pesticide-contaminated soil is 0.27%, while the mineral composition is 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 chlorofluorocyanide polyester residue 30.57mg / kg, atrazine residue was 29.84mg / kg, acetochlor residue was 15.65mg / kg, and the heavy metal content did not exceed the standard. Opal light shale and carbon nanotubes are mixed...

Embodiment 3

[0054] According to the method for remediating organic-contaminated soil provided by the present invention, the polychlorinated biphenyl-contaminated soil of a waste capacitor sealing point in the Yangtze River Delta is remediated. Specific steps are as follows:

[0055] Step 1. Soil pretreatment: remove the sundries in the polychlorinated biphenyl-contaminated soil, naturally air-dry, pulverize and sieve, and sample 6 parts at multiple points for soil monitoring and analysis. The organic matter content of the pesticide-contaminated soil is 0.19%, and the mineral composition is 0.19%. It is 88% kaolin, 12% others, the average value of each monitoring index: pH 6.4, total salt content 0.44%, PCB 68.65mg / kg, Hg 4.23mg / kg, Cu 59.56mg / kg, Pb 82.47mg / kg, Cd 0.27mg / kg, As 48.18mg / kg, evenly mixed with a soil dispersant in a mass ratio of 200:3, the soil dispersant is composed of arsenic sandstone, opal light shale and carbon nanotubes in a mass ratio It is mixed in 10:5:1;

[005...

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Abstract

The invention provides a method for remediating soil contaminated by organic matter. The method comprises the following steps: Step 1, soil pretreatment; Step 2, soil continuous leaching; Step 3, degradation of organic pollutants and recovery of heavy metals; Step 4, soil Microecological Restoration. The present invention combines the rinsing method with the biological mud method. Firstly, by mixing the soil dispersant with the soil, soil aggregation and cementation during the leaching process are avoided, and the leaching rate is accelerated by adopting a continuous rinsing method. The compound combination improves the leaching effect. The setting of the electrospinning composite filter felt realizes the recycling of the eluent. The immobilized mixed degrading bacteria agent is used in the restoration of the soil micro-ecology. The organic pollutants not eluted by the eluent and the surfactants adsorbed in the soil can be degraded within a day. The repair time is short and the cost is low. The repaired soil does not need subsequent treatment and can be directly sown, with good economic benefits.

Description

technical field [0001] The invention relates to the technical field of soil pollution restoration, in particular to a restoration method for organic-contaminated soil. Background technique [0002] At present, the treatment method of organic matter-contaminated soil is to excavate the soil for subsequent treatment, including landfill, incineration, leaching, adsorption, ultrasonic wave, 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 there is secondary pollution of escaping harmful gases and residual ash; adsorption method, ultrasonic wave, microwave The purification effect is not ideal, the biological method has a long treatment period, and the treatment effect is not ideal; the elution method is easy to operate and has high treatment efficiency, but there are problems that most organic matter and eluent are l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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