Xin Song

Affiliation

Institute of Soil Science，Chinese Academy of Sciences

Track

Biography

1) Dr. Xin Song is a Professor in the Institute of Soil Science, Chinese Academy of Sciences. Prior to joining the Chinese Academy of Sciences, she worked for ARCADIS U.S. as a hydrogeologist and environmental engineer for 8 years. Dr. Song holds a doctor’s degree from University of Maryland, College Park. She specializes in the occurrence, fate and transport, and remediation of emerging PFASs, and sustainable remediation of soil and groundwater contamination. 2) Title：Occurrence, sorption, and remediation of PFASs in subsurface Abstract: Per- and polyfluoroalkyl substances (PFASs), a class of anthropogenic chemicals, have become a great concern globally in recent years. A series of studies were conducted to investigate the occurrence of PFASs in soil, sediment, groundwater, surface water, plant leaves, vegetables, and grain crops in areas nearby a landfill, fluorochemical industrial parks and non-industrial areas. Source identification and the potential health risks of traditional and emerging PFASs were carried out. Furthermore, the sorption behaviors and mechanisms of PFASs onto different soils were studies, to shed light on the fate and transport of PFASs in subsurface. In addition, the effects due to the presence of chlorinated volatile organic compounds (cVOCs) in the form of dense non-aqueous-phase organic liquids (DNAPL) on the distribution and migration of PFASs at a contaminated site were evaluated. An in-situ remediation of the mixture of PFASs and cVOCs by thermally activated persulfate at a low-temperature condition of ~50°C was conducted in a field-scale demonstration program. Finally, to address the challenges of PFASs remediation in groundwater, the sorptive removal behavior of PFOS from aqueous solutions using different forms of layered double hydroxides were investigated. The systematic introduction of PFASs will provide a basis for the fundamental understanding of distributions, fate and transport and remediation of PFASs in the subsurface.