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Method for enhancing persulfate remediation of phenanthrene contaminated soil by regulating different water-soil ratios

A technology of contaminated soil and persulfate, applied in the field of contaminated soil remediation, can solve the problems of harsh reaction conditions, limited application range, and many reaction raw materials, and achieve the effect of non-toxic products, low price, and enhanced remediation effect

Inactive Publication Date: 2020-05-05
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The prior art (CN106345800A) discloses a method of utilizing persulfate-calcium peroxide compound oxidation to remove polycyclic aromatic hydrocarbons in soil. After uniformity, add distilled water to make mud, add oxalate ion, ferrous ion and persulfate ion in turn to the mud, stir evenly to obtain mud reaction liquid, and put the mud reaction liquid in the dark to stand for reaction, after the reaction is finished Removal of polycyclic aromatic hydrocarbons in soil; however, calcium peroxide, oxalate ions and ferrous ions are required in this technology, and the reaction raw materials are too many and the cost is high; it needs to be left to stand in the dark for reaction, and the reaction conditions are harsh. The scope is limited; therefore, it is urgent to research and develop a method with low cost, simple operation, unlimited reaction conditions and significant removal effect on phenanthrene

Method used

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  • Method for enhancing persulfate remediation of phenanthrene contaminated soil by regulating different water-soil ratios
  • Method for enhancing persulfate remediation of phenanthrene contaminated soil by regulating different water-soil ratios
  • Method for enhancing persulfate remediation of phenanthrene contaminated soil by regulating different water-soil ratios

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Effect of different water-to-soil ratios on sodium persulfate remediation of phenanthrene-contaminated soil effect

[0039] 1. Experimental method

[0040] Weigh 25g of sodium persulfate and dissolve it in 1L of deionized water, put it in a stirrer and stir evenly, then add it to the phenanthrene-contaminated soil, and set the mass ratio (water-to-soil ratio) of deionized water and phenanthrene-contaminated soil to 0.5:1, 1: 1, 5:1, 10:1, 20:1 and 30:1, put them into a constant temperature oscillator for reaction (keep 150rpm, 60°C) and take them out after 1h, 4h, 8h, 12h, 16h; Centrifuge in a centrifuge and keep at 4000rpm for 10min; after solid-liquid separation, add acetone: n-hexane = 1:1 extract to the solid soil part for ultrasonic extraction, vortex for 2min, ultrasonic extraction for 10min, and finally through high-speed centrifugation centrifuge at 4000 rpm for 10 min, take the supernatant, and repeat three times. Calculate the effect of sodium pers...

Embodiment 2

[0045] Example 2 Effect of adjusting and controlling different water-soil ratios on the effect of sodium persulfate to remediate phenanthrene-contaminated soil under different reaction temperature conditions

[0046] 1. Experimental method

[0047] Weigh 25g of sodium persulfate and dissolve it in 1L of deionized water, put it in a stirrer and stir evenly, then add it to the phenanthrene-contaminated soil, and set the water-soil ratio to 0.5:1, 1:1, 5:1, 10:1 and 20:1 respectively , put it into a constant temperature oscillator (set the temperature at 40°C, 60°C, 80°C, and keep 150rpm) and take it out after reacting for 16h; the sample after taking out was centrifuged by a high-speed centrifuge and kept at 4000rpm for 10min; after solid-liquid separation, the soil Partially add acetone: n-hexane = 1:1 extract for ultrasonic extraction, vortex mix for 2 min, then ultrasonic extraction for 10 min, and finally centrifuge in a high-speed centrifuge, keep at 4000 rpm for 10 min, ta...

Embodiment 3

[0051] Example 3 Effect of different water-soil ratios on sodium persulfate remediation of phenanthrene-contaminated soil under different sodium persulfate concentrations

[0052] 1. Experimental method

[0053] Weigh 5g, 25g, and 50g of sodium persulfate and dissolve them in 1L of deionized water, put them in a stirrer and stir evenly, then add them to the phenanthrene-contaminated soil, and set the water-to-soil ratios to 0.5:1, 1:1, 5:1, and 10: 1 and 20:1, put it into a constant temperature oscillator (maintain 150rpm, set the temperature to 60°C) and take it out after reacting for 16h; the sample after taking out is centrifuged by a high-speed centrifuge, keeping at 4000rpm for 10min; after solid-liquid separation, the soil part Add acetone: n-hexane = 1:1 extract for ultrasonic extraction, vortex mix for 2 minutes, ultrasonic extraction for 10 minutes, and finally centrifuge in a high-speed centrifuge at 4000 rpm for 10 minutes, take the supernatant, and repeat three tim...

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Abstract

The invention discloses a method for enhancing persulfate remediation of phenanthrene contaminated soil by regulating different water-soil ratios. The method comprises the following step: adding persulfate and water into phenanthrene contaminated soil for reaction, wherein the mass ratio of the water to the phenanthrene contaminated soil is (20-30): 1. By regulating the mass ratio of water to phenanthrene contaminated soil, the mass of sodium persulfate participating in the reaction is also improved, water and soil are mixed more uniformly, and the oxidative degradation efficiency of phenanthrene in the soil is also improved; meanwhile, persulfate can stably generate sulfate radical free radicals with strong oxidizing property under a thermal activation condition, so that the remediation effect of persulfate on phenanthrene contaminated soil is further enhanced; in addition, the method is easy and convenient to operate, reaction conditions are not limited, and the method has wide application prospects in phenanthrene contaminated soil remediation.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation. More specifically, it relates to a method for enhancing persulfate remediation of phenanthrene-contaminated soil by regulating different water-to-soil ratios. Background technique [0002] Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons, PAHs) refer to a class of hydrocarbons containing two or more benzene rings, which are ubiquitous in the environment and have persistence; at the same time, they are easy to accumulate in organisms, cause cancer, and cause teratogenicity , mutagenic. PAHs in the environment mainly come from industrial production, especially polycyclic aromatic hydrocarbons from petrochemical, coking, coal chemical and other industrial enterprises, which are collected in the soil through seepage, atmospheric deposition, etc., causing serious soil ecological risks. [0003] There are many methods for removing organic pollutants in the exis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 侯思颖邓一荣李取生
Owner JINAN UNIVERSITY