Medicament for in-situ repair of high-concentration polycyclic aromatic hydrocarbon polluted soil and application thereof

A polycyclic aromatic hydrocarbon, in-situ remediation technology, applied in the field of soil pollution remediation, can solve the problems of difficult to popularize results and large differences in reactivity, and achieve the effects of high utilization rate, environmental disturbance, and technical environmental friendliness.

Inactive Publication Date: 2018-06-29
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reactivity of different types of oxidants and free radicals to different types of pollutants is quite different. Considering the large differences in polluted soil in actual sites, it is necessary to develop formulations for different types of pollutants and soil properties.
At present, there have been some basic research on the degradation of PAHs by chemical oxidation technology at home and abroad, but most of the research is concentrated in aqueous solution system or laboratory scale research, and the results are difficult to be extended to practical applications.
More importantly, there is no research on the use of highly active nanomaterials coupled with persulfate to achieve the remediation of PAHs in soil and on a pilot scale.

Method used

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  • Medicament for in-situ repair of high-concentration polycyclic aromatic hydrocarbon polluted soil and application thereof
  • Medicament for in-situ repair of high-concentration polycyclic aromatic hydrocarbon polluted soil and application thereof
  • Medicament for in-situ repair of high-concentration polycyclic aromatic hydrocarbon polluted soil and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Under laboratory test conditions, the effect of the amount of micro-nano iron flakes on the degradation efficiency of PAHs in soil catalyzed by persulfate degradation was investigated.

[0028]Taking the soil of the actual PAHs polluted site as the research object, in the heterogeneous reaction of sodium persulfate (PS) catalytic activation using micro-nano iron sheets, a 250mL brown serum bottle with a polytetrafluoroethylene stopper was used as the reactor, and 100g was weighed The soil and 100mL of reaction solution were added, the initial concentration of persulfate was 30g / kg (126mM), and the initial dosage of micro-nano iron flakes were 0.35 (6.3mM), 0.70 (12.6mM), 1.4 (25.2mM) , 3.5 (63mM) and 7.0g / kg (126mM), the molar ratios of micro-nanometer iron flakes and sodium persulfate were 1:20, 1:10, 1:5, 1:2 and 1:1, PAHs in polluted soil The concentration of the solution is 201.1 mg / kg, the water-soil ratio is 1:1, and the reaction bottle is placed in a vibrating be...

Embodiment 2

[0037] Taking the actual PAHs-contaminated site soil as the research object, the effect of sodium persulfate dosage on the removal efficiency of PAHs was studied.

[0038] In the heterogeneous reaction of sodium persulfate (PS) catalyzed by micro-nano iron sheets, a 250mL brown serum bottle with a polytetrafluoroethylene plug was used as the reactor, and 100g of soil was weighed and 100mL of the reaction solution was added. The initial dosage of iron sheet is 3.5g / kg (63mM), the initial concentration of sodium persulfate is 7.5 (31.5), 15 (63mM), 30 (126mM), 60g / kg (252mM), sodium persulfate and micro The molar ratios of the nano-iron flakes are 1:2, 1:1, 2:1 and 4:1 respectively, the concentration of PAHs in the polluted soil is 201.1mg / kg, and the ratio of water to soil is 1:1. The rotational speed is 150 rpm and the temperature is 25°C.

[0039] In the experiment of adding 3.5g / kg micro-nano iron flakes alone, there is no need to add sodium persulfate, and other conditions...

Embodiment 3

[0046] On the basis of the optimal dosage of sodium persulfate and micro-nanometer iron flakes screened in the laboratory test (embodiment 1 and embodiment 2) are respectively 30 and 3.5g / kg (molar ratio is 2:1), carried out Pilot demonstration project.

[0047] Select a PAHs-contaminated site, the concentration of total PAHs is 201.1mg / kg, the area of ​​the pilot test is 90 square meters, the depth of pollution is 4 meters deep, and the total earth volume is 360 cubic meters. The specific site steps are as follows: on the basis of the previous land leveling, first build the in-situ reaction pool through earthwork construction work, then backfill the polluted soil, first add sodium persulfate agent and stir evenly, then add micro-nano iron flake suspension and stir Evenly, the sodium persulfate consumption is 54kg / cubic soil (30 * 1.8=54; 1 cubic soil = 1.8 tons of soil), and the consumption of micronano iron sheet is 6.3kg / cubic soil (3.5 * 1.8=6.3), naturally react under ...

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Abstract

The invention discloses a medicament for in-situ repair of high-concentration polycyclic aromatic hydrocarbon polluted soil and application thereof; effective components are micro-nano iron sheets andsodium persulfate; and the high-activity micro-nano iron sheets are used for efficiently catalyzing sodium persulfate to generate high-oxidation free radicals so as to effectively degrade high-concentration PAHs (201.1 mg/kg) in soil. The medicament formula of the micro-nano iron sheets activating persulfate not only can efficiently degrade PAHs under laboratory underbrush conditions, but also can quickly and efficiently repair the high-concentration PAHs polluted soil in situ under the pilot scale test scale (360 cubes of soil); and the enzyme activity index of the repaired soil under environmental protection is not prominently changed. The repair medicament is suitable for in-situ field repair of the high-concentration PAHs polluted soil, is high in efficiency, convenient to operate andenvironment-friendly, and provides broad prospect for repair of the high-concentration PAHs polluted soil.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to a medicament for in-situ remediation of high-concentration polycyclic aromatic hydrocarbon-contaminated soil and an application thereof. Background technique [0002] With the intensification of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals, soil pollution has become a global environmental pollution issue that has attracted much attention. According to the US EPA statistics, the US currently has 294,000 polluted sites, and the restoration cost between 2004 and 2033 is expected to reach 200 billion US dollars. In our country, with the steady implementation of the policies of "retreating from the second to the third" and "retreating from the city and entering the park", almost all the polluting enterprises such as chemical industry, printing and dyeing in the main urban area have moved into the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/02
CPCB09C1/08B09C2101/00C09K17/02
Inventor 方国东宋岳朱长银周东美
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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