Method for repairing organic matter contaminated soil with reinforced persulfate

A technology for polluted soil and persulfate, applied in the field of polluted soil remediation, can solve the problems of poor stability of sulfate radicals, low removal rate of organic pollutants, low effective utilization rate of persulfate, etc., and achieve stable solubilization effect. , Improve the effect of continuous action, avoid the effect of rapid decomposition

Pending Publication Date: 2020-02-21
JINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, persulfate (S 2 o 8 2- ) is activated by heating to produce sulfate radicals (SO 4 -· ) decomposition efficiency is too fast, due to sulfate radicals (SO 4 -· ) is less stable, thus resulting in a large amount of sulfate radicals (SO 4 -· ) is consumed for no reason, so that the effective utilization rate of persulfate is low, so that the removal rate of organic pollutants is not high

Method used

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  • Method for repairing organic matter contaminated soil with reinforced persulfate
  • Method for repairing organic matter contaminated soil with reinforced persulfate
  • Method for repairing organic matter contaminated soil with reinforced persulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Take by weighing 50g sodium persulfate and take by weighing 5g surfactant (sodium dodecylsulfonate (SDS), sodium dodecylbenzenesulfonate (SDBS), sodium dodecylsulfate (SLS), lauryl sulfate respectively Sodium alkyl diphenyl ether disulfonate (C 12-MADS)) was dissolved in 1L of deionized water, placed in a stirrer and stirred evenly, 20mL was added to a sample bottle, placed in a constant temperature shaker, and the temperature was maintained at 25, 40, 60, and 80°C respectively. One set of samples was taken separately and frozen in an ice-water bath to stop the reaction. Use a pH meter to measure the pH value of the sample, and use an automatic potentiometric titrator to quantify the remaining sodium persulfate content.

[0036] The result is as Figure 1 ~ Figure 4 Shown, along with the raising of sodium persulfate heating temperature and the prolongation of heating time, sodium dodecyl diphenyl ether disulfonate (C 12 -MADS) group had the slowest decomposition rate...

Embodiment 2

[0038] Weigh 25g of sodium persulfate and dissolve it in 1L of deionized water, put it in a stirrer and stir evenly, take 20mL and add it to 1g of soil, put it in a constant temperature oscillator and react for 1, 4, 8, 12, 16h, then take it out, keep 150rpm, 60 ℃; the sample taken out was centrifuged by a high-speed centrifuge and kept at 4000rpm for 10 minutes; after solid-liquid separation, the soil part was added to the extraction solution of acetone: n-hexane = 1:1 for ultrasonic extraction, and vortexed for 2 minutes before ultrasonic extraction 10min, and finally centrifuged by a high-speed centrifuge at 4000rpm for 10min, the supernatant was taken, and repeated three times. The removal efficiency of phenanthrene in this example is 59.78% (1h), 64.82% (4h), 67.32% (8h), 69.44% (12h), 72.01% (16h).

Embodiment 3

[0040] Weigh 25g of sodium persulfate and 1g of sodium dodecyl diphenyl ether disulfonate, dissolve them in 1L of deionized water, put them in a stirrer and stir evenly, take 20mL and add them to 1g of soil, and put them in a constant temperature oscillator to react 1, 4 , Take it out after 8, 12, and 16 hours, keep it at 150rpm, 60°C; centrifuge the taken out sample through a high-speed centrifuge, keep it at 4000rpm, for 10 minutes; add acetone to the soil part after solid-liquid separation: n-hexane = 1:1 extract Ultrasonic extraction was performed, vortexed for 2 minutes, then ultrasonically extracted for 10 minutes, and finally centrifuged by a high-speed centrifuge at 4000 rpm for 10 minutes. The supernatant was taken and repeated three times. The removal efficiency of phenanthrene in this example is 68.14% (1h), 71.99% (4h), 76.22% (8h), 82.73% (12h), 84.40% (16h).

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Abstract

The invention discloses a method for repairing organic matter contaminated soil with a reinforced persulfate. According to the method, repairing is carried out through adding a specific kind of surfactant and a persulfate into the organic matter contaminated soil and reacting. Through combined application of the specific surfactant and the persulfate, the surfactant has a good stabilizing effect on thermal activation of the persulfate, rapid decomposition of the persulfate can be avoided, and the continuous action effect of the persulfate is improved; meanwhile, through the solubilizing effectof the surfactant, the solubility of organic pollutants in the soil is increased, so that the organic pollutants are eluted from the soil, and the degradation efficiency of the organic pollutants inthe soil is improved.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, and more specifically, relates to a method for strengthening the effect of sodium persulfate in remediating phenanthrene-contaminated soil. Background technique [0002] Persistent organic pollutants (Persistent Organic Pollutions, POPs) are a class of organic substances with the characteristics of toxicity, persistence, bioaccumulation and long-distance transportation. Polycyclic aromatic hydrocarbons (Polycyclic AromaticHydrocarbons, PAHs) as typical persistent organic pollutants are easy to accumulate in organisms, and have carcinogenic, teratogenic and mutagenic effects at the same time. [0003] Chemical oxidation remediation technology (Chemical Oxidation, ISCO) is a common method to deal with site pollutants. Persulfate (S 2 o 8 2- ) as a new repair agent in chemical oxidation technology, it has the characteristics of being more stable than hydrogen peroxide under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 侯思颖邓一荣李取生苏嘉韵杨子鹏
Owner JINAN UNIVERSITY
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