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Eluent for soil polluted by organochlorine pesticides and repair method by using same

A pesticide-contaminated soil and eluent technology, applied in the field of contaminated soil remediation, can solve the problems of technical difficulties in recycling, low elution efficiency, and expensive remediation costs, and achieve efficient and economical elution remediation, high elution efficiency, and wash low cost effect

Inactive Publication Date: 2011-04-06
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of the existing technology are mainly the relatively low elution efficiency, technical difficulties in recycling, expensive elution and repair costs, and unclear market application prospects
The main reasons for the defects are: although the surfactant can elute some organic pollutants in the polluted soil, the overall efficiency is not high; the soil particles have an adsorption effect on the surfactant molecules, resulting in a high input amount of the surfactant ; Surfactant market prices are relatively high, resulting in an expensive overall repair cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: for organochlorine pesticide total concentration greater than 10ppm and less than 100ppm polluted soil

[0012] The contaminated soil was collected from a closed pesticide production site in Jiangsu. The sampling point was about 1 meter away from the surface. The soil organic matter content was 0.66%, the pH value was 6.84, and the cation exchange capacity was 18cmolkg -1 , 25.5% of soil particles are smaller than 2μm, 66.9% are 2-50μm, and 7.6% are larger than 50μm. The target pollutants are organochlorine pesticides DDTs, and the total concentration of pollutants is 82.99±4.28mg kg -1 , the concentrations of the four homologues are p,p’-DDT 58.80±3.80 mg kg -1 , o,p’-DDT 6.92±0.63 mg kg -1 , p,p'-DDD 15.55±0.89 mg kg -1 , p,p'-DDE 1.69±0.09 mg kg -1 . Before elution, air-dry the polluted soil and sieve it to remove unbreakable substances such as large-sized stones and plant roots in the soil, then pour the soil particles with a particle size of less ...

Embodiment 2

[0014] Embodiment 2: for organochlorine pesticide total concentration greater than 100ppm and less than 1000ppm polluted soil

[0015] The contaminated soil was collected from a closed pesticide production site in Liyang, Jiangsu Province. The soil surface was collected at 0-50cm. The soil organic matter content was 4.12%, the pH value was 6.87, the cation exchange capacity was 16cmol / kg, and the soil particles were less than 2μm in size accounting for 20.24%. 2- The particle size of 50 μm accounts for 71.36%, and the particle size greater than 50 μm accounts for 8.40%. The target pollutants are organochlorine pesticides DDTs, and the total concentration of pollutants is 616.7±9.82mg kg -1 , the concentrations of its five homologues were p,p’-DDT 67.37±3.05 mg kg -1 , o,p’-DDT 316.58±15.81 mg kg -1 , p,p’-DDD 1.65±0.05 mg kg -1 , p,p'-DDE 134.30±3.50 mg kg -1 , o,p'-DDE 96.17±3.24 mg kg -1 . Before elution, air-dry the polluted soil and sieve it to remove unbreakable subs...

Embodiment 3

[0017] Embodiment 3: for organochlorine pesticide total concentration greater than 1000ppm and less than 10000ppm polluted soil

[0018] The contaminated soil was collected from a closed pesticide production site in Hebei Province. The soil surface was collected at 0-50cm. The soil organic matter content was 4.72%, the pH value was 6.47, the cation exchange capacity was 21cmol / kg, and the soil particles were smaller than 2μm. The particle size accounted for 18.24%, 2-50μm Particle size accounted for 51.51%, greater than 50μm accounted for 30.25%, the target pollutants were organochlorine pesticides DDTs, and the total concentration of pollutants was 1219.28±16.41mg kg -1 , the concentrations of its five homologues were p,p’-DDT 114.80±6.40 mg kg -1 , o,p’-DDT 688.43±9.14 mg kg -1 , p,p'-DDD 0.48±0.06 mg kg -1 , p,p'-DDE 184.45±8.21 mg kg -1 , o,p'-DDE 231.12±15.05 mg kg -1 . Before elution, air-dry the polluted soil and sieve it to remove unbreakable substances such as la...

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Abstract

The invention discloses an eluent for soil polluted by organochlorine pesticides and a repair method by using the same. The eluent comprises 5-10%v / v petroleum ether with the boiling range of 60-90 DEG C, 10%v / v of normal propyl alcohol, and the balance of water. The method for repairing the soil polluted by the organochlorine pesticides comprises the steps of: screening polluted soil; adding theeluent with the volume 2 times relative to the soil, heating and stirring; separating upper-layer liquid in a stirrer, carrying out soil-water separation on a lower-layer soil suspending liquid system through plate frame pressure filtration to complete elution repair. When the eluent is adopted to elute the polluted soil with the organochlorine pesticide concentration of 10-20,000ppm, the remove rate on target pollutants all can reach about 80%, and the elution cost is about 600-2,500RMB / ton of soil along with the different pollution degrees. The method has an application prospect on repairing the soil of an area polluted by closed and relocated organochlorine pesticide production enterprises.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted soil, in particular to an eluent used for the soil in a site highly polluted by organochlorine pesticides and a method for remediating polluted soil by using the eluent. Background technique [0002] At present, there are many remediation methods for the remediation of organochlorine soil pollutants, which are mainly divided into microbial remediation, animal and plant remediation, and physical and chemical remediation. Among them, the application number: 200910032690.8 provides a method for repairing DDT-contaminated soil by ultrasonic waves. This method mainly uses the cavitation effect and disturbance effect of ultrasonic waves to degrade or reduce organochlorine pesticide pollutants such as DDT in the soil. However, this method requires a large investment in equipment, which is not conducive to popularization. Application No.: 200610053042.7 provides a cationic surfactant-enha...

Claims

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Application Information

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IPC IPC(8): C09K17/14C09K17/40B09C1/02
Inventor 杨兴伦叶茂蒋新王芳卞永荣谷成刚魏海江
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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