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Petroleum-hydrocarbon-contaminated soil repairing medicament and use method

A technology for contaminated soil and remediation agents, applied in the field of organic contaminated soil remediation, can solve problems such as low activation efficiency, achieve good oxidation effect, strong operability, and improve removal efficiency.

Inactive Publication Date: 2017-08-04
NANJING AGRICULTURAL UNIVERSITY
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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 provide a new type of practical and efficient petroleum hydrocarbon contaminated soil remediation agent for the problem of low activation efficiency in the practice of persulfate oxidation remediation of high concentration petroleum hydrocarbon polluted soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take diesel oil-contaminated soil, the content of diesel oil is 12338mg / kg, add it to the conical flask, add pure water to the conical flask at room temperature, the volume-to-mass ratio of the added pure water to the contaminated soil is 5 / 1, mix well Then add sodium persulfate, zero-valent iron and calcium peroxide to the Erlenmeyer flask respectively. The dosage is 2mmol / g soil. After adding the oxidant, mix well, and then seal the Erlenmeyer flask with tinfoil. Then it was placed in a constant temperature shaker at 25° C. and 160 rpm, and the reaction was shaken for 36 hours. After the reaction is over, shake the slurry in the bottle and pour it into a 30mL glass centrifuge bottle, centrifuge at a speed of 3000r / min for 10min, pour off the supernatant after centrifugation, and take out the soil to air dry. After air-drying, the diesel content in the soil was determined by ultraviolet spectrophotometry. The results show that: the removal effect of sodium persulfate ...

Embodiment 2

[0023] Take diesel oil polluted soil, the content of diesel oil is 15737mg / kg, add it into the conical flask, add pure water into the conical flask at room temperature, the volume-to-mass ratio of the added pure water and polluted soil is 5 / 1, stir well Add sodium persulfate and zero-valent iron in the Erlenmeyer flask, the amount of sodium persulfate is 2mmol / g soil, the amount of zero-valent iron is according to Na 2 S 2 o 8 / Fe 0 (Molar ratio) 10 / 0, 10 / 1, 5 / 1, 5 / 2, 5 / 3, 5 / 4, 5 / 5 were added, after adding the oxidizing agent, stir well, and then seal the Erlenmeyer flask with tinfoil. Then it was placed in a constant temperature shaker at 25° C. and 160 rpm, and the reaction was shaken for 36 hours. After the reaction is over, shake the mud in the bottle and pour it into a 30mL glass centrifuge bottle, centrifuge at a speed of 3000r / min for 10min, pour off the supernatant after centrifugation, take out the soil and air-dry it, and then use ultraviolet spectrophotometry De...

Embodiment 3

[0025]Take diesel oil polluted soil, the content of diesel oil is 17603mg / kg, add it into the conical flask, add pure water into the conical flask at room temperature, the volume-to-mass ratio of the added pure water to polluted soil is 5 / 1, stir evenly Add sodium persulfate and calcium peroxide in the Erlenmeyer flask, the amount of sodium persulfate is 2mmol / g soil, the amount of calcium peroxide is according to Na 2 S 2 o 8 / CaO 2 (Molar ratio) 5 / 0, 5 / 1, 5 / 2, 5 / 5 were added, after adding the oxidant, stir well, and then seal the Erlenmeyer flask with tinfoil. Then it was placed in a constant temperature shaker at 25° C. and 160 rpm, and the reaction was shaken for 36 hours. After the reaction is over, shake the slurry in the bottle and pour it into a 30mL glass centrifuge bottle, centrifuge at a speed of 3000r / min for 10min, pour off the supernatant after centrifugation, take out the soil and air-dry it, and measure it by ultraviolet spectrophotometry Diesel content in ...

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PUM

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Abstract

The invention relates to a petroleum-hydrocarbon-contaminated soil repairing medicament and a use method and belongs to the technical field of soil environment repairing. The medicament is composed of sodium persulfate (Na2S2O8), zero-valent iron (Fe <0>) and calcium peroxide (CaO2), and the molar ratio of the Na2S2O8 to Fe <0> to CaO2 is 5: 2: 2. The Na2S2O8 is fed into a slurry system, the Fe <0> and the CaO2 are added for interphase activation, two types of free radicals with extremely high oxidability including a sulfate radical anion and a hydroxyl radical (.OH) can be obtained simultaneously for decomposing petroleum hydrocarbon in soil, wherein the formula of the sulfate radical anion can be found in the specification. According to use parameters of the repairing medicament, the feeding amounts of the sodium persulfate, the zero-valent iron and the calcium peroxide are 2 mmol / g, 0.8 mmol / g and 0.8mmol / g of soil correspondingly; the water soil ratio (milliliter: g) is 2.5: 1; a reaction is performed for 4-8 hours after the water and soil are uniformly mixed; and the water can be used repeatedly. Compared with a traditional chemical method, the range of acted organic pollutants is wider; the Fe <0> and the CaO2 are wide in resource, easy to obtain and low in cost; the two types of activating agents including the CaO2 and the Fe <0> are fed, the activating effect is better, and secondary pollution is avoided; and the reaction is mild, and safety is high.

Description

technical field [0001] The invention relates to a repairing agent for petroleum hydrocarbon contaminated soil and a method for using the same, mainly through the activation of sodium persulfate by an activator to generate sulfate radicals and hydroxyl radicals (·OH), two highly oxidizing free radicals, remove petroleum pollutants in soil, and belong to the technical field of organic polluted soil remediation. Background technique [0002] Petroleum is the most important energy source in today's society. With the rapid development of our country's society and economy, the demand for oil has also increased dramatically. Soil oil pollution caused by oil extraction, transportation, processing and use is also becoming more and more serious. According to the 2015 soil pollution survey report, at least 5 million hectares of soil in my country have been polluted by oil, accounting for about 20% to 30% of the total area of ​​oilfield mining areas. Due to my country's backward oil...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/06
CPCB09C1/08C09K17/06
Inventor 占新华李倩倩何跃
Owner NANJING AGRICULTURAL UNIVERSITY
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