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Method for eluting and restoring 1,2,4-trichlorobenzene polluted soil by cyclodextrin solution

A technology of polluted soil and cyclodextrin, which is applied in the field of remediation of soil organic matter pollution, can solve the problems of no washing agent recycling, secondary pollution, waste of resources, etc., and achieve the effect of easy promotion, simple operation, and realization of recycling

Inactive Publication Date: 2010-03-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After searching the existing documents, it was found that Chinese Patent Publication No. CN 1570021A, published on January 26, 2005, with the patent name "Repair Method for Surfactant-Enhanced Adsorption and Fixation of Organic Pollution of Soil", mentioned in the patent that firstly use cationic Surfactants adsorb and fix organic pollutants and then use non-ionic surfactants to elute and restore them. However, because cationic surfactants can strongly adsorb on soil particles, it is easy to cause secondary pollution when applied to soil remediation.
Chinese Patent Publication No. CN 101181716A, published on May 21, 2008, the title of the patent is "A Method for Synergistically Remediating Soil Nitrobenzene Pollution with Anion-Nonionic Mixed Surfactants". The technical elements such as the optimal ratio of pollution, effective concentration, and usage amount, as well as the method of synergistically repairing soil nitrobenzene pollution with anion-nonionic mixed surfactants, but due to the toxicity of organic surfactants to plants and soil microorganisms, etc. , secondary pollution may occur after remediation of contaminated soil, and at the same time there is no recycling of the eluent, resulting in waste of resources
The Chinese patent number is CN 101170732A, the publication date was May 7, 2008, and the title of the patent is "Method for treating leaching waste water from soil polluted by benzene series compounds". The soil leaching wastewater of organic matter can be treated efficiently and harmlessly on site, but the report on the green composite leaching and remediation technology of high-concentration toxic organic pollution sites in the patent is ominous
There are few studies on the adsorption behavior of natural surfactants (such as cyclodextrin, etc.) on soil and sediments and their effects on the adsorption of coexisting organic matter. Trichlorobenzene pollution method has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve cyclodextrin in distilled water to prepare a solution with a concentration of 15g / L; pollute fresh (non-polluted) soil samples with 1,2,4-trichlorobenzene in acetone solution, and obtain a simulated soil sample with a pollution amount of 465.63mg / kg Contaminated soil samples were mixed, and placed in a dark place to allow the acetone to volatilize naturally to obtain 1,2,4-trichlorobenzene-contaminated soil samples. Weigh 100g of the above simulated contaminated soil sample and add it evenly into the plexiglass column, fill the lower part of the compacted column with 3-5cm of quartz sand and a little glass wool, add 1-1.5cm of quartz sand and a little glass wool on top of the soil sample after adding the soil sample cotton. Use a cyclodextrin solution with a concentration of 15g / L to rinse the plexiglass column after adding soil from top to bottom. In the experiment, a peristaltic pump is used to control the flow rate of the eluent to 20mL / h, wherein the weight...

Embodiment 2

[0024] Dissolve cyclodextrin in distilled water to prepare a solution with a concentration of 1.5g / L; pollute soil samples with 1,2,4-trichlorobenzene in acetone solution to prepare 1,2,4-trichlorobenzene-contaminated soil samples , to obtain a soil sample with a pollution level of 465.63 mg / kg. Weigh 100g of the above-mentioned simulated contaminated soil sample and add it evenly into the plexiglass column, compact it, fill the lower part of the column with 3cm of quartz sand extracted with n-hexane and a little glass wool, add 1-1.5cm on top of the soil sample after adding the soil sample Quartz sand and a little glass wool, the ratio of the weight (g) of the control polluted soil sample to the volume (mL) of the cyclodextrin solution is 1:20 (W / V), and the volume of the cyclodextrin solution used is 2000 mL. Cyclodextrin with a concentration of 1.5g / L was added to rinse the 1,2,4-trichlorobenzene-contaminated soil samples from top to bottom. In the experiment, a peristaltic...

Embodiment 3

[0029] Contaminate the soil sample with the acetone solution of 1,2,4-trichlorobenzene to prepare a 1,2,4-trichlorobenzene-contaminated soil sample, and obtain soil with a pollution amount of 465.63 mg / kg. Weigh 100g of the above-mentioned simulated contaminated soil sample and add it evenly into the plexiglass column, compact it, fill the lower part of the column with 3cm of quartz sand extracted with n-hexane and a little glass wool, add 1-1.5cm on top of the soil sample after adding the soil sample Quartz sand and a little glass wool, the ratio of the weight (g) of the control polluted soil sample to the volume (mL) of the cyclodextrin solution is 1:20 (W / V), and the volume of the cyclodextrin solution used is 2000 mL. Add cyclodextrin with a concentration of 20g / L, and rinse the 1,2,4-trichlorobenzene-contaminated soil sample from top to bottom. In the experiment, a peristaltic pump was used to control the flow rate of the eluent to 20mL / h. Collected once, a total of 20 fr...

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Abstract

The invention discloses a method for eluting and restoring 1,2,4-trichlorobenzene polluted soil by a cyclodextrin solution, which relates to a restoring method of soil organic pollution. The method comprises the following steps: (1) dissolving cyclodextrin in distilled water to prepare a cyclodextrin solution of 1.5-20g / L; (2) polluting a fresh soil sample by a 1,2,4-trichlorobenzene acetone solution to obtain a simulative polluted soil sample with a pollution load of 465.63mg / kg; (3) weighting and uniformly adding the simulative polluted soil sample into an organic glass column, adding quartzsand of 3-5 cm and a little glass wool on the lower part of the column, adding the polluted soil sample and then adding quartz sand of 1-1.5 cm and a little glass wool on the polluted soil sample; eluting the organic glass column with the soil from above down by the cyclodextrin solution; (4) adding active carbon in a container, then adding the cyclodextrin solution containing 1,2,4-trichlorobenzene after eluting, shaking the container for 24h by a shaking table, and then purifying the cyclodextrin solution through a filter with a glass fiber film for standby. The removal rate of the 1,2,4-trichlorobenzene in soil can reach 52-78 percent.

Description

technical field [0001] The invention relates to a method for remediating soil organic matter pollution, in particular to a method for remediating soil 1,2,4-trichlorobenzene pollution by using a natural surfactant as a leaching agent without secondary pollution. Background technique [0002] In view of the seriousness and harmfulness of soil pollution, developed countries have formulated contaminated soil remediation plans since the 1980s, and my country's soil pollution remediation has also received extensive attention in recent years. At present, there are many methods for the remediation of contaminated soil. Among them, the soil leaching method is widely used in the remediation of severely polluted soil. It is a remediation technology that removes organic and inorganic pollutants in the soil by injecting and pumping eluent. It is mainly used to treat chemical adsorption in the pores of soil particles and It is an efficient and permanent in-situ repair technology. The r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02G01N30/02
Inventor 谢吉民孙成初亚飞刘军吕晓萌郭会琴杨绍贵
Owner JIANGSU UNIV
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