Method for treating organochlorine-pesticide-contaminated soil through activated persulfate oxidization

A technology for pesticide-contaminated soil and activated persulfate, which is applied in the field of organic-contaminated soil, can solve the problems of narrow soil pH range and low removal efficiency, and achieve the goals of reducing quenching effect, improving degradation efficiency and improving utilization rate Effect

Inactive Publication Date: 2017-05-17
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology solves the problems of narrow applicable pH range and low removal efficiency of organochlorine pesticide-contaminated soil treated with ferrous salt activated persulfate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example compares the four ways of using persulfate alone, hydrogen peroxide activation persulfate alone, ferrous iron ion activation persulfate alone, Fenton method, ferrous and hydrogen peroxide joint activation of persulfate in soil. α-666 (α-HCH) removal rate. The results show that the combination of ferrous iron and hydrogen peroxide activated persulfate oxidation system has significantly better oxidative degradation effect on α-HCH in soil than other reaction systems

[0018] Under normal temperature conditions, take 3g of α-HCH polluted soil EPA VOA sample bottle respectively, add 15mL of a certain concentration of mixed aqueous solution of persulfate and hydrogen peroxide, and react for 240min. The operating conditions are as follows:

[0019] (1) Separate persulfate system: Na 2 S 2 o 8 The dosage is 4mmol, and the pH is 3.

[0020] (2) Activated persulfate system with hydrogen peroxide alone: ​​Na 2 S 2 o 8 The dosage is 4mmol, the molar ratio of h...

Embodiment 2

[0027] This example examines the influence of the molar ratio of ferrous ion, hydrogen peroxide and persulfate on the removal effect of α-HCH in soil. It can be seen from the table below that the removal rate of α-HCH increases significantly when the dosage of persulfate and ferrous ion is increased. When the molar ratio of persulfate and ferrous ion remains unchanged, increasing the dosage of hydrogen peroxide will lead to faster removal of α-HCH. The operating conditions are as follows:

[0028] (1) The molar ratio of ferrous ion, hydrogen peroxide and persulfate is 1:5:5, the dosage of persulfate is 2mmol, and the pH is 3.

[0029] (2) The molar ratio of ferrous ion, hydrogen peroxide and persulfate is 1:5:10, the dosage of persulfate is 4mmol, and the pH is 3.

[0030] (3) The molar ratio of ferrous ion, hydrogen peroxide and persulfate is 1:10:5, the dosage of persulfate is 2mmol, and the pH is 3.

[0031] (4) The molar ratio of ferrous ion, hydrogen peroxide and persu...

Embodiment 3

[0035] This example compares the removal effect of ferrous and hydrogen peroxide combined activated persulfate on the removal of α-HCH in soil at different initial pH. It can be seen from the table below that the removal efficiency of the system for pollutants exceeds 80% no matter under acidic or alkaline conditions. However, as the pH continued to rise, the removal rate of α-HCH showed a downward trend.

[0036] Na 2 S 2 o 8 The dosage is 4mmol, the molar ratio of ferric ion to hydrogen peroxide is 1 / 5 / 5, and the pH of the mixed aqueous solution of persulfate and hydrogen peroxide is adjusted to 3, 5, 7 with sodium hydroxide and dilute sulfuric acid , 9, 11, the experimental results are shown in the table below:

[0037] pH α-HCH removal rate / % 3 81.64 5 85.47 7 86.13 9 82.05 11 80.77

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Abstract

The invention discloses a method for treating organochlorine-pesticide-contaminated soil through activated persulfate oxidization, and belongs to the field of soil remediation. The method is characterized in that ferrous iron, hydrogen peroxide and activated persulfate are utilized to generate strong-oxidizability sulfate radical anion and hydroxyl free radical, thus realizing the oxidization and degradation of organochlorine-pesticide in soil. Compared with an existing Fenton method and a ferrous individually-activated persulfate method, the method has the advantages of being high in activating efficiency, and high in contaminant degradation efficiency; in addition, the method is simple to operate, wide in pH applying scope, obvious in oxidization and degradation effect, and high in potential in the field of environment and soil contamination control and treatment.

Description

technical field [0001] The patent of the present invention relates to a treatment technology for organic-contaminated soil, in particular to a method for activating persulfate oxidation to treat organochlorine pesticide-contaminated soil. Background technique [0002] Advanced oxidation technology is a new type of technology newly developed in recent years for the treatment of refractory organic pollutants. It has the advantages of short cycle, quick effect, low cost, and good treatment effect. It has become a research topic in the field of contaminated soil remediation at home and abroad. Hotspots and Frontiers. In particular, compared with traditional advanced oxidation technologies such as Fenton’s method, activated persulfate advanced oxidation technology has the advantages of strong stability, good solubility, wide applicable pH range and long life of sulfate radicals, which is more conducive to high Degradation of concentrated organic pollutants. [0003] Under norma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 董良飞陈垚张凤娥
Owner CHANGZHOU UNIV
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