Method for removing persistent organic pollutants in soil

A technology of organic pollutants and persistence, applied in the field of soil pollution remediation, can solve the problems of difficult disposal of leaching waste liquid, long time required, and large consumption of eluent, so as to reduce the cost of soil remediation and the number of repeated uses Multiple, good economic benefits

Active Publication Date: 2020-02-04
河南省环境保护科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although microwave extraction and supercritical extraction have high treatment efficiency, they are costly and unsatisfactory, resulting in limited application range; advanced oxidation method has low cost and wide application range, but it has a great impact on the physical and chemical properties of soil, and the treatment efficiency still needs to be improved. Further improve
The biological method is low in cost and environmentally friendly, but the biodegradation treatment of most persistent organic pollutants has the disadvantages of long cycle time and low overall efficiency
[0003] Although the cost of the currently used leaching method is low, there are problems such as low miscibility between most organic substances and eluents, large consumption of eluent, disposal of leaching waste liquid, long time-consuming waste liquid treatment, leaching Secondary pollution of soil by chemicals
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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  • Method for removing persistent organic pollutants in soil
  • Method for removing persistent organic pollutants in soil

Examples

Experimental program
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Effect test

Embodiment 1

[0034] According to the method for removing persistent organic pollutants in soil provided by the invention, polycyclic aromatic hydrocarbon pyrene-contaminated soil is repaired. Specific steps are as follows:

[0035] Step 1. Soil pretreatment: remove the impurities in the pyrene-contaminated soil, air-dry them naturally, crush and sieve them, and take 6 mixed samples from multiple points for soil monitoring and analysis. The organic matter content of the pyrene-contaminated soil is 0.19%, while the mineral composition is 100%. Kaolin, the average value of various monitoring indicators: pH 6.1, total salt content 0.43%, pyrene 406.74mg / kg, other organic pollutants and heavy metal content did not exceed the standard, and the mass ratio of 200:1 with the soil dispersant was mixed evenly. The soil dispersant is formed by mixing arsenic sandstone, opal light shale and carbon nanotubes in a mass ratio of 10:5:1;

[0036] Step 2, soil continuous leaching: pre-prepared biological-a...

Embodiment 2

[0044] According to the method for removing persistent organic pollutants in soil provided by the invention, the compound polluted soil of nitrophenol and chromium is repaired. Specific steps are as follows:

[0045] Step 1, soil pretreatment: remove the sundries in the nitrophenol and chromium compound polluted soil, air-dry naturally, pulverize and sieve, and carry out soil monitoring and analysis in 6 parts of multi-point mixed sampling. The organic matter content of the pesticide polluted soil is 0.22%, while The mineral composition is 91% kaolin, 9% others, the average value of various monitoring indicators: pH 6.3, total salt content 0.21%, nitrophenol 248.93mg / kg, chromium 35.68mg / kg, and the mass ratio of 200% with soil dispersant : 3 mix evenly, and described soil dispersant is mixed by arsenic sandstone, opal light shale and carbon nanotube by mass proportioning as 10:5:1;

[0046] Step 2, soil continuous leaching: pre-prepared 15% mass fraction of hydroxypropyl-β-c...

Embodiment 3

[0054] According to the method for removing persistent organic pollutants in soil provided by the invention, the soil polluted by dioctyl phthalate and various heavy metals is repaired. Specific steps are as follows:

[0055] Step 1. Soil pretreatment: Remove the impurities in the dioctyl phthalate-contaminated soil, air-dry naturally, crush and sieve, and take 6 samples of multi-point mixed samples for soil monitoring and analysis. The organic matter content of the pesticide-contaminated soil is 0.24%. The mineral composition is 90% montmorillonite, 10% kaolin, the average value of various monitoring indicators: pH 6.7, total salt content 0.34%, dioctyl phthalate 603.5mg / kg, Hg 4.6mg / kg, Cu 53.8 mg / kg, Pb 71.4mg / kg, Cd 0.29mg / kg, Cr4.32mg / kg, As 39.3mg / kg, mixed evenly with the soil dispersant in a mass ratio of 200:2, and the soil dispersant is made of arsenic sandstone , opal light shale and carbon nanotubes are mixed at a mass ratio of 10:5:1;

[0056] Step 2, soil conti...

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Abstract

The invention provides a method for removing persistent organic pollutants in soil. The method includes the following steps that step one, soil pretreatment is performed; step two, continuous soil leaching is performed; step three, degradation of the persistent organic pollutants and heavy metal recovery are performed; and step four, pyrolysis and high-voltage pulse discharge oxidation are performed. A soil loosening agent is mixed with the soil first to avoid the aggregation of the soil due to the effects of ultrasound, leaching pressure and leaching agent components in the leaching process,and can further solubilize in synergy with the cavitation effect of ultrasound, and most of the persistent organic pollutants are removed by leaching; and then in the pyrolysis-high-voltage pulse discharge oxidation process, heating and temperature rising are performed first, the desorption and decomposition of the persistent organic pollutants can be promoted, and the high-temperature environmentimproves the use ratio of high-voltage pulse energy. The method is simple in process and mature in equipment, saves manpower and material resources, is high in removal rate of the persistent organicpollutants and heavy metal in soil and thorough in removal, and has no secondary pollution.

Description

technical field [0001] The invention relates to the technical field of soil pollution remediation, in particular to a method for removing persistent organic pollutants in soil. Background technique [0002] The removal methods of persistent organic pollutants in soil mainly include physical, chemical and biological methods. The most common physical method is ventilation and decontamination, which mainly takes away the organic pollutants in the soil through artificial airflow, so as to reduce soil pollution. This method can only transfer pollutants, but cannot fundamentally solve the problem. Pollution problems caused by persistent organic pollutants. Chemical methods include chemical washing, microwave extraction, advanced oxidation and supercritical extraction and other repair methods. Although microwave extraction and supercritical extraction have high treatment efficiency, they are costly and unsatisfactory, resulting in limited application range; advanced oxidation met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/06B09C1/08B01D39/16
CPCB01D39/16B01D2239/0631B09C1/02B09C1/065B09C1/085
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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