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Dr. Xiaying Xin is an Assistant Professor in the Department of Civil Engineering at Queen’s University, with academic training in environmental science and engineering. Her research centers on emerging contaminants, such as per- and polyfluoroalkyl substances (PFAS), flame retardants, micro- and nanoplastics, pharmaceuticals and personal care products (PPCPs), cyanobacteria and their associated toxins, as well as antibiotic resistance. She explores these contaminants’ detection, environmental fate, toxicity, and removal across various systems, including water, wastewater, drinking water distribution networks, and soils.

Dr. Xin is recognized for her pioneering work in nanobubble technology, which she applies to water and wastewater treatment, drinking water distribution system, remediation of contaminated soils, and the management of invasive species. Her work stands at the intersection of multiple disciplines, environmental and chemical engineering, analytical and environmental chemistry, and microbiology, and is focused on designing affordable, energy-efficient, and climate-adaptive treatment technologies. A key goal of her research is to support communities in meeting the United Nations Sustainable Development Goals (UN SDGs).

Prior to joining Queen’s, Dr. Xin held a position as Research Assistant Professor at the State Key Laboratory of Marine Pollution and the School of Energy and Environment at City University of Hong Kong (September 2021 – August 2022). 

Dr. Xin is a Co-Director of the Drinking Water Quality Group. 

Active Research Topics
•    Emerging Microbial and Chemical Contaminants
•    Nanobubble Technology 
•    Water and Wastewater Treatment, Drinking Water Distribution System Remediation, Soil Remediation 
•    Invasive Species Removal
•    Environmental Chemistry and Toxicology