State Key Laboratory of Heavy Oil Processing, State Key Laboratory of Petroleum Pollution Control, Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China.
State Key Laboratory of Heavy Oil Processing, State Key Laboratory of Petroleum Pollution Control, Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China.
Chemosphere. 2018 Jan;190:296-306. doi: 10.1016/j.chemosphere.2017.09.148. Epub 2017 Sep 30.
The present study investigated the impacts of water matrix constituents (CO, HCO, Cl, Br, PO, HPO, HPO, NO, SO and natural organic matters (NOM) on the oxidation of a mixture of benzene, toluene, ethylbenzene, and xylenes (BTEX) by thermally activated persulfate (PS). In the absence of matrix constituents, the BTEX oxidation rates decreased in the following order: xylenes > toluene ≈ ethylbenzene > benzene. HCO/CO and NOM inhibited the BTEX oxidation and the inhibiting effects became more pronounced as the HCO/CO/NOM concentration increased. SO, NO, PO and HPO did not affect the BTEX oxidation while HPO slightly inhibited the reaction. The impacts of Cl and Br were complex. Cl inhibited the benzene oxidation while 100 mM and 500 mM of Cl promoted the oxidation of m-xylene and p-xylene. Br completely suppressed the benzene oxidation while 500 mM of Br strongly promoted the oxidation of xylenes. Detailed explanations on the influence of each matrix constituent were discussed. In addition, various halogenated degradation byproducts were detected in the treatments containing Cl and Br. Overall, this study indicates that some matrix constituents such as NOM, HCO, CO, HPO, Cl and Br may reduce the BTEX removal efficiency of sulfate radical-based advanced oxidation process (SR-AOP) and the presence of Cl and Br may even lead to the formation of toxic halogenated byproducts.
本研究考察了水基质成分（CO、HCO、Cl、Br、PO、HPO、HPO、NO、SO 和天然有机物（NOM）对热激活过硫酸盐（PS）氧化苯、甲苯、乙苯和二甲苯（BTEX）混合物的影响。在没有基质成分的情况下，BTEX 的氧化速率按以下顺序降低：二甲苯＞甲苯≈乙苯＞苯。HCO/CO 和 NOM 抑制了 BTEX 的氧化，随着 HCO/CO/NOM 浓度的增加，抑制作用变得更加明显。SO、NO、PO 和 HPO 对 BTEX 氧化没有影响，而 HPO 则略微抑制了反应。Cl 和 Br 的影响较为复杂。Cl 抑制了苯的氧化，而 100mM 和 500mM 的 Cl 则促进了间二甲苯和对二甲苯的氧化。Br 完全抑制了苯的氧化，而 500mM 的 Br 则强烈促进了二甲苯的氧化。对每种基质成分的影响进行了详细的解释。此外，在含有 Cl 和 Br 的处理中检测到了各种卤代降解副产物。总体而言，本研究表明，一些基质成分（如 NOM、HCO、CO、HPO、Cl 和 Br）可能会降低基于硫酸盐自由基的高级氧化工艺（SR-AOP）对 BTEX 的去除效率，并且 Cl 和 Br 的存在甚至可能导致有毒卤代副产物的形成。
