标题: Propylene glycol-mixed steam enhanced extraction for an efficient and sustainable remediation of PAHs-contaminated soil

作者: Yue, R (Yue, Rui); Chen, ZK (Chen, Zhikang); Zhao, LK (Zhao, Likun); Song, X (Song, Xin); Chen, CQ (Chen, Chaoqi); Qi, J (Qi, Jin); Mao, XH (Mao, Xuhui)

来源出版物: JOURNAL OF HAZARDOUS MATERIALS 卷: 459 文献号: 132029 DOI: 10.1016/j.jhazmat.2023.132029 出版年: OCT 5 2023

摘要: An innovative thermal desorption method, propylene glycol (PG)-mixed steam enhanced extraction, is proposed for a highly efficient remediation of polycyclic aromatic hydrocarbons (PAHs)-contaminated soil. It is found that injecting PG-mixed steam into soil column could obtain > 99% removal efficiencies of PAHs either for the pyrene-spiked soil, or for the contaminated field soil with high-molecular-weight PAHs. PG is a safe and low-cost dihydric alcohol with a boiling point higher than water. When the PG-mixed steam penetrated the contaminated soil, the PG vapor preferentially condensed to form a hot liquid with concentrated PG (e.g., from 30 wt% PG in gas phase to 90 wt% PG in the liquid phase), which would significantly solubilize the PAHs and enhance their desorption from soils. The results also revealed that the effluents derived from the PG-mixed steam could be purified by removing the desorbed PAHs using a simple coagulation treatment, and the recovered PG solution could be reused. The plant assay using wheat seeds showed that the remediated soil had a good regreening potential. Our results demonstrate that PG-mixed steam injection is a promising thermal desorption method for an efficient and sustainable remediation of PAHs-contaminated soil.

作者关键词: Editor; Feng Xiao; Soil remediation; Steam enhanced extraction (SEE); Solvent-mixed steam; PAHs-contaminated soil; Soil flushing

KeyWords Plus: POLYCYCLIC AROMATIC-HYDROCARBONS; TRANSFORMATION PRODUCTS; THERMAL-DESORPTION; REMOVAL; INJECTION; DEGRADATION; SURFACTANT; AGENTS; ZONE

地址: [Yue, Rui; Chen, Zhikang; Zhao, Likun; Chen, Chaoqi; Qi, Jin; Mao, Xuhui] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.

[Song, Xin] Chinese Acad Sci, Inst Soil Sci, Nanjing 210008, Peoples R China.

通讯作者地址: Mao, XH (通讯作者)，Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.

电子邮件地址: clab@whu.edu.cn

影响因子：13.6