REACTION KINETICS STUDY ON H2O2 AND Na2FeO4 REMOVING TOTAL PETROLEUM HYDROCARBON FROM SOIL

DONG Wan-tao; WANG Ya-jun; LI Li; ZHANG Xing

doi:10.13205/j.hjgc.202110025

Volume 39 Issue 10

Jan. 2022

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DONG Wan-tao, WANG Ya-jun, LI Li, ZHANG Xing. REACTION KINETICS STUDY ON H2O2 AND Na2FeO4 REMOVING TOTAL PETROLEUM HYDROCARBON FROM SOIL[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(10): 178-184. doi: 10.13205/j.hjgc.202110025

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DONG Wan-tao, WANG Ya-jun, LI Li, ZHANG Xing. REACTION KINETICS STUDY ON H₂O₂ AND Na₂FeO₄ REMOVING TOTAL PETROLEUM HYDROCARBON FROM SOIL[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(10): 178-184. doi: 10.13205/j.hjgc.202110025

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REACTION KINETICS STUDY ON H₂O₂ AND Na₂FeO₄ REMOVING TOTAL PETROLEUM HYDROCARBON FROM SOIL

doi: 10.13205/j.hjgc.202110025

1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730000, China;
2. Chengdu Branch of China Railway Research Institute Co., Ltd, Chengdu 610000, China

Received Date: 2020-08-24
Available Online: 2022-01-26

Abstract

Abstract

Two oxidants, H₂O₂ and Na₂FeO₄, were used to remove TPH from soil. The reaction kinetic model was established according to the relationship between reaction conditions and reaction rate. The factors such as reaction rate change, half-life and TPH removal rate in the reaction process were discussed and compared, and their reaction laws were also found out. The results showed that the process of removing TPH by H₂O₂ conformed to the first-order reaction kinetic model. The process of removing TPH by Na₂FeO₄ conformed to the second-order reaction kinetic model. The increase of H₂O₂ concentration led to the increase of reaction kinetic constant, and the increase of Na₂FeO₄ concentration led to the decrease of reaction kinetic constant. The initial reaction rates of H₂O₂ solution with TPH at concentrations of 0.078, 0.156, 0.234 mol/L TPH were 0.61×10^-3, 1.38×10^-3, 2.09×10^-3 mol/(L·min). The initial reaction rates of Na₂FeO₄ solution with TPH at three concentrations of 0.070, 0.140 and 0.210 mol/L were 13.30×10^-3, 20.47×10^-3, 12.86×10^-3 mol/(L·min). The reaction rates of the two oxidants with TPH were in the order of Na₂FeO₄>H₂O₂. The half-life of H₂O₂ reacted with TPH was 40.40~66.50 min, and the half-life of Na₂FeO₄ reacted with TPH was 4.10~7.14 min. The half-life of H₂O₂ was about 10 times of that of Na₂FeO₄. The removal rate of TPH in the soil by the two oxidants could reach more than 60%, which would not cause residue in the soil, but the utilization rate was low. The characteristics of the reaction rate, half-life and removal rate of the two oxidants in the process of removing TPH were summarized. Finally, the paper screened and optimized the reaction conditions to provide a theoretical basis for soil remediation in the Loess Plateau.
- total petroleum hydrocarbons (TPH),
- soil organic matter (SOM),
- reaction rate,
- H₂O₂,
- Na₂FeO₄

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References(40)

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