标题: Selective removal of phenanthrene for the recovery of sodium dodecyl sulfate by UV-C and UV-C/PDS processes: Performance, mechanism and soil washing recycling
作者: Wang, ZN (Wang, Zenan); Sun, TT (Sun, Tiantai); Luo, T (Luo, Tian); Shi, XL (Shi, Xiaolu); Lin, H (Lin, Heng); Zhang, H (Zhang, Hui)
来源出版物: JOURNAL OF HAZARDOUS MATERIALS 卷: 400 文献号: 123141 DOI: 10.1016/j.jhazmat.2020.123141 出版年: DEC 5 2020
摘要: Soil washing is commonly used to remediate PAHs contaminated sites. However, the effluent after washing containing PAHs and surfactant may cause secondary pollution and remediation cost is still high, unless PAHs are selectively removed from the effluent and the surfactant is recovered and recycled. Herein, ultraviolet irradiation (254 nm, UV-C) and its combination with peroxydisulfate (UV-C/PDS) were applied to selectively degrade PHE in the synthetic soil washing effluent. At natural pH of 8.6, 98.2 % of PHE was removed within 30 min under 6 W UV-C irradiation. After adding 2 mM PDS, the time was shortened to 8 min but still achieving 98.7 % PHE removal and less toxic treated effluent than UV-C alone. The O-1(2) was the main oxidizing species in UV-C alone system, while O-1(2) as well center dot OH and SO4 center dot- were responsible for PHE removal in the UV-C/PDS system. The possible intermediates of PHE degradation were recognized using liquid chromatography-mass spectrometry technique and the degradation pathways in both systems were proposed. Soil washing recycling experiments verified the recovered SDS could be reused directly without surfactant supplement and the soil washing efficiency changed insignificantly during three cycles. It indicates UV-C/PDS coupled with soil washing is a promising remediation technology.
PubMed ID: 32574877
作者关键词: Phenanthrene; Sodium dodecyl sulfate; UV-C irradiation; Peroxydisulfate; Surfactant recovery
地址: [Wang, Zenan; Sun, Tiantai; Luo, Tian; Shi, Xiaolu; Lin, Heng; Zhang, Hui] Wuhan Univ, Dept Environm Sci & Engn, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Peoples R China.
通讯作者地址: Lin, H; Zhang, H (通讯作者)，Wuhan Univ, Dept Environm Sci & Engn, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Peoples R China.
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