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Method for repairing polycyclic aromatic hydrocarbon contaminated soil by chemical oxidation

A technology for polluted soil and polycyclic aromatic hydrocarbons, applied in the field of soil remediation, can solve problems such as unsatisfactory oxidation effect, difficulty in achieving remediation goals, and large consumption of oxidants, and achieve low treatment costs, reduced remediation treatment costs, and improved physical properties Effect

Inactive Publication Date: 2019-04-05
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of large oxidant consumption, unsatisfactory oxidation effect and difficulty in achieving the restoration target in the existing chemical oxidation restoration process of polycyclic aromatic hydrocarbon contaminated soil

Method used

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  • Method for repairing polycyclic aromatic hydrocarbon contaminated soil by chemical oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Get 1000g of actual PAH-contaminated soil and put it into a small stainless steel bucket, wherein the main components of PAH pollutants in the PAH-contaminated soil of the present embodiment are benzo(a)pyrene, dibenzo[a,h ] anthracene, indene benzene (1,2,3-cd) pyrene, benzo [b] fluoranthene, which are high ring pollutants with ring number ≥ 5; add 60g soda lime solid (i.e. polluted 6% of the soil mass), stirred for 10 min; then, added 50 mL of dioctyl sodium sulfosuccinate solution with a mass percentage concentration of 2%, stirred for 10 min; then added 60 g of sodium persulfate solid, stirred for 10 min; finally added 100 mL Tap water, stirred for 10 minutes, the liquid-solid ratio was 1.5:10; placed at 50°C for 15 days. The concentration of PAHs before and after the treatment of the contaminated soil was measured, and the results are shown in Table 1.

[0034] Table 1:

[0035] Pollutants

[0036] Note: ND means not detected.

Embodiment 2

[0038] Get 1000g of actual PAH-contaminated soil and put it into a small stainless steel bucket, wherein the main components of PAH pollutants in the PAH-contaminated soil of the present embodiment are benzo(a)anthracene, naphthalene and benzo[k] Fluoranthene, which is a low-ring pollutant with a ring number≤5; add 20g quicklime solid (i.e. 2% of the polluted soil quality) to the polluted soil, stir for 15min; then, add 150mL mass percent concentration of 0.2% coconut Oleylamine polyoxyethylene ether solution, stirred for 15 minutes; then added 20 g of potassium persulfate solid, stirred for 15 minutes; finally added 150 mL of tap water, stirred for 10 minutes, the liquid-solid ratio was 3:10. Place at 5°C for 5 days. The concentration of PAHs before and after the treatment of the contaminated soil was measured, and the results are shown in Table 2.

[0039] Table 2:

[0040] Pollutants

[0041] Note: ND means not detected.

Embodiment 3

[0043] Get 1000g of actual PAH-contaminated soil and put it into a small stainless steel bucket, wherein the main components of PAH pollutants in the PAH-contaminated soil of the present embodiment are Benzo(a)pyrene and indenophenyl(1,2,3-cd)pyrene, which are a mixture of high-ring and low-ring pollutants; 40 g of quicklime solids (i.e. 4% of the mass of the contaminated soil) were added to this contaminated soil , stirred for 15 min; then, added 50 mL of a mixed solution of disodium stearyl sulfosuccinamic acid, polyethylene glycol and stearylamine polyoxyethylene ether with a concentration of 0.1% by mass, and stirred for 15 min; then added 40 g of ammonium persulfate solid, stir for 15min; finally add 50mL tap water, stir for 10min, the liquid-solid ratio is 1:10. Place at 25°C for 7 days. The concentration of PAHs before and after the treatment of the contaminated soil was measured, and the results are shown in Table 3.

[0044] table 3:

[0045]

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Abstract

The invention provides a method for repairing polycyclic aromatic hydrocarbon contaminated soil by chemical oxidation. The method includes the steps: primarily crushing the polycyclic aromatic hydrocarbon contaminated soil; adding alkaline pretreating agents into the soil and performing pretreatment; adding activating agents and uniformly stirring the soil and the activating agents; adding persulfate oxidizing agents and uniformly stirring the soil and the persulfate oxidizing agents; finally, naturally curing the soil. By the aid of an alkaline pretreating agent, activating agent and oxidizing agent treatment process, polycyclic aromatic hydrocarbon is oxidized by highly reactive hydroxyl radicals generated by persulfate in an alkaline environment, the activating agents are added, the water solubility of the polycyclic aromatic hydrocarbon is effectively improved, the use efficiency of the persulfate is improved, repair treatment cost is reduced, the method can be widely applied to repairing of a high-concentration compound polycyclic aromatic hydrocarbon contaminated site, environmental pollution caused by the polycyclic aromatic hydrocarbon is reduced, and environmental safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for chemical oxidation remediation of soil polluted by polycyclic aromatic hydrocarbons. Background technique [0002] Soil is an important part of the environment, the direct or indirect production base of human food, the core element of the earth's ecosystem, and the main repository of environmental geochemical cycles of various pollutants. With the explosive growth of population and the intensification of human activities, more and more pollutants enter the soil through various channels such as accident leakage, artificial discharge, industrial production, dry and wet deposition, agricultural production, etc., resulting in a decline in the quality of the soil environment and endangering the human body. health and ecological safety. According to the National Soil Pollution Survey Bulletin issued by the Ministry of Environmental Protection and the ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 郭沨宁智赵颖田靓刘更生
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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