H2O2、Na2FeO4去除土壤中总石油烃的反应动力学

董万涛; 王亚军; 李丽; 张兴

doi:10.13205/j.hjgc.202110025

H₂O₂、Na₂FeO₄去除土壤中总石油烃的反应动力学

doi: 10.13205/j.hjgc.202110025

董万涛¹,
王亚军^1, ,,
李丽²,
张兴²

1. 兰州理工大学土木工程学院, 兰州 730000;
2. 中铁科学研究院有限公司成都分公司, 成都 610000

基金项目:

中铁科学研究院有限公司重点项目[中铁科研院（科研）字2018-KJ003-Z003-XB]；国家自然科学基金资助项目（41967043）；甘肃省自然科学基金项目（20JR5RA461）；甘肃省高等学校产业支撑引导项目（2020C-40）。

详细信息

作者简介:
董万涛(1988-),男,硕士研究生,主要研究方向为水土污染与修复。d316284531@163.com

通讯作者:
王亚军(1979-),男,博士,副教授,主要研究方向为水土污染与修复。wyj79626@163.com

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出版历程
- 收稿日期: 2020-08-24
- 网络出版日期: 2022-01-26

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

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

摘要

摘要: 利用H₂O₂、Na₂FeO₄ 2种氧化剂对土壤中TPH进行去除实验，根据反应条件和反应速率的关系建立反应动力学模型，并对反应过程中反应速率变化、半衰期、TPH去除率等因素进行讨论和对比，寻找其反应规律。结果表明：H₂O₂去除TPH过程符合一级反应动力学模型。Na₂FeO₄去除TPH过程符合二级反应动力学模型，H₂O₂浓度增大导致反应动力学常数增加，Na₂FeO₄浓度增大导致反应动力学常数减小。采用0.078，0.156，0.234 mol/L 3种浓度H₂O₂溶液与TPH的初始反应速率分别为0.61×10^-3，1.38×10^-3，2.09×10^-3 mol/（L·min），浓度为0.070，0.140，0.210 mol/L的Na₂FeO₄溶液与TPH的初始反应速率分别为13.30×10^-3，20.47×10^-3，12.86×10^-3 mol/（L·min）。2种氧化剂与TPH的反应速率大小为：Na₂FeO₄>H₂O₂。H₂O₂、NaFeO₄与TPH反应半衰期分别为40.40~66.50，4.10~7.14 min。H₂O₂的半衰期约为Na₂FeO₄的10倍。2种氧化剂对土壤中TPH去除率均可达到60%以上，但利用率较低。总结了2种氧化剂在去除TPH过程中反应速率、半衰期和去除率的特点，最终筛选并优化反应条件，为黄土高原土壤修复提供参考。
- 总石油烃 /
- 土壤有机质 /
- 反应速率 /
- H₂O₂ /
- Na₂FeO₄
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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