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
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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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