Department of Environmental Science and Engineering, Wuhan University, 430079, China; Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000, Clermont-Ferrand, France.
Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000, Clermont-Ferrand, France.
Chemosphere. 2021 Jan;263:127996. doi: 10.1016/j.chemosphere.2020.127996. Epub 2020 Aug 21.
In this work, the decomposition of phenanthrene (PHE) in mimic and real soil washing (SW) effluents was investigated using UVB light assisted activation of hydrogen peroxide (HO) and peroxydisulfate (PDS) oxidation processes. The impact of oxidant concentration, initial pH, and coexisting inorganic anions (Cl, HCO and NO) on PHE removal was evaluated. PHE degradation efficiency under UVB irradiation followed the order of UVB/PDS > UVB/HO > UVB. The increase of PHE decomposition efficiency was observed with increasing oxidant dose in the range of 2-30 mM upon the two processes. It was found Cl played different roles in the two activation systems depending on the solution pH and Cl concentration. The influence of HCO on PHE elimination was negligible in the UVB/PDS process, while an inhibitory effect was observed in the UVB/HO system. Nitrate inhibited the PHE decay in both UVB/HO and UVB/PDS processes at the investigated pH 3.3, 7.1 and 8.6. Finally, the application of the two activation processes to the treatment of real SW effluents indicated that up to 85.0% of PHE degradation could be reached under 6 h UVB irradiation with PDS, indicating UVB/PDS process is a promising alternative for SW effluent treatment.
在这项工作中，使用 UVB 光辅助过氧化氢（HO）和过氧二硫酸盐（PDS）氧化过程，研究了模拟和实际土壤洗脱（SW）废水中菲（PHE）的分解。评估了氧化剂浓度、初始 pH 值和共存无机阴离子（Cl、HCO 和 NO）对 PHE 去除的影响。在 UVB 照射下，PHE 降解效率的顺序为 UVB/PDS > UVB/HO > UVB。在两种过程中，当两种氧化剂剂量在 2-30 mM 范围内增加时，观察到 PHE 分解效率增加。发现 Cl 在两种活化系统中根据溶液 pH 值和 Cl 浓度发挥不同的作用。HCO 在 UVB/PDS 过程中对 PHE 消除的影响可以忽略不计，而在 UVB/HO 体系中观察到抑制作用。硝酸盐在研究的 pH 值 3.3、7.1 和 8.6 下，在 UVB/HO 和 UVB/PDS 两种过程中均抑制 PHE 的衰减。最后，将两种活化过程应用于实际 SW 废水的处理表明，在 6 小时 UVB 照射下，PDS 可达到高达 85.0%的 PHE 降解，表明 UVB/PDS 过程是 SW 废水处理的一种有前途的替代方法。
