Christelle Bou Nehme Sawaya

PhD Environmental Engineering

Hometown: Lebanon

Advisor: Dr. Adam Smith


B.E. Environmental Engineering

M.S. Environmental and Water Resources Engineering

PhD Environmental Engineering

My research focuses on understanding the behavior of per- and polyfluoroalkyl substances (PFAS) in wastewater treatment systems, investigating microbially-driven remediation strategies, microbial pathways, and the development of analytical methods to track PFAS transformation and fate.

Congratulations to Christelle for receiving an Outstanding TA Award by the USC Sonny Astani Dept of Civil & Environmental Engineering!

What is your career aspiration?

As a researcher, my goal is to build a career at the intersection of environmental biotechnology and water quality. I hope to contribute to the development of sustainable treatment solutions that safeguard public and environmental health.

What advice do you have to others that want to pursue a similar path?

My advice to others would be stay curious and open to interdisciplinary learning. Environmental engineering research often requires bridging microbiology, chemistry, and engineering, so being flexible and collaborative is key. I also encourage others to seek hands-on lab experiences early, since that’s where much of the real problem-solving happens.

What is the next step for your research?

The next step in my research is to investigate how PFAS interact with microbial communities and treatment processes in greater detail. I am focusing on identifying potential transformation products, understanding how PFAS partition between different matrices, and refining analytical methods to better track these compounds. This will help bridge knowledge gaps on PFAS fate in wastewater treatment and support the development of more effective removal strategies.