Thusitha Wijewardhana Rathnayake
Why did you decide to pursue a graduate degree?
My decision to pursue a graduate degree was driven by a combination of professional experiences and a strong desire to make a meaningful impact in the field of environmental engineering. While working on various water and wastewater treatment projects at the Asian Institute of Technology (AIT) in Thailand, I was directly exposed to complex environmental challenges, particularly the pervasive issue of microplastic pollution. This hands-on experience deepened my understanding of the real-world consequences of environmental issues. At AIT, I became increasingly involved in research exploring how microplastics are treated and degraded in water systems. My work extended into studying the effects of UV-LED technologies for wastewater treatment, which sparked my curiosity about how UV light affects microplastic breakdown. This realization motivated me to seek advanced training and immerse myself in this research. I wanted to address these scientific gaps by investigating degradation pathways in microplastics. UBC offered the perfect environment for me to pursue these complex questions and develop novel approaches informed by rigorous scientific research.
Why did you decide to study at UBC?
Choosing to study at UBC felt like the perfect step for me, especially after spending years working in the field of environmental engineering and management. A big part of my decision was also the chance to work with Dr. Sara Beck, whose work with UV-based water treatment matches my interests almost exactly. Knowing I’d have the chance to learn and contribute to innovative research made UBC even more appealing. All around, the combination of inspiring professors, supportive classmates and the university’s commitment to making a real-world impact made me confident that UBC was the right place to continue my journey in environmental engineering. Also, I was especially excited about the Environmental Systems Engineering (ESE) program. The unique thing about ESE is that it blends ideas from civil, chemical and biological engineering, so instead of focusing on just one narrow specialty, you get to see how things connect across the whole system. This fit perfectly with my past experiences and made me eager to dive deeper into collaborative projects that really matter.
What is it specifically, that your program offers, that attracted you?
Our ESE program offered a unique balance of research innovation, sustainability, environmental engineering aspects and knowledge. What stood out to me was the hands on lab environment, access to world-class instrumentation and the flexibility to explore real environmental challenges in both developed and developing contexts. I also appreciate how the program supports both fundamental research and applied fieldwork, something that aligned perfectly with my experience and future goals.
What was the best surprise about UBC or life in Vancouver?
I was pleasantly surprised by how lively and supportive the research community is here at UBC. It’s not just about the lab; it’s about meaningful conversations, collaborations and feeling supported even when the work gets tough. Life in Vancouver also constantly surprises me. With every road trip I take, I discover another peaceful lake, coffee shop or hiking trail tucked away in nature. Vancouver is amazing.
What aspect of your graduate program do you enjoy the most or are looking forward to with the greatest curiosity?
I really enjoy my research, interpreting the invisible like tracking how molecular bonds change inside microplastics. It’s fascinating to turn those tiny shifts into meaningful environmental insights. I find it deeply rewarding to participate in constructive research discussions, where insightful feedback and expert advice help guide my work toward meaningful and impactful outcomes. These collaborative exchanges not only refine my approach but also inspire new ideas and directions. I am highly motivated by the prospect of publishing my research findings in the future, and I'm eager to contribute valuable knowledge to the scientific community and share my work with a broad audience.
What aspects of your life or career before now have best prepared you for your UBC graduate program?
Before coming to UBC, I spent over a decade in research roles at AIT in Thailand, where I also completed my master’s degree in the Department of Environmental Engineering and Management (EEM). I worked on membrane-based water and wastewater treatment, water reuse, bioreactors and the marine plastics abatement (MPA) program, among other areas, as part of international research projects, often involving fieldwork and pilot-scale settings. These experiences provided me with hands-on practical and project management skills. More importantly, they gave me perspective on how science can serve people. That foundation has shaped how I approach every aspect of my PhD work. I would like to thank all my professors and co-workers at EEM-AIT for their invaluable support and guidance throughout my journey.
What do you like to do for fun or relaxation?
I love driving on long road trips and discovering the countryside. There’s something peaceful about winding roads, a good playlist and coffee in a quiet town. I’m also passionate about photography, which allows me to capture unique moments and express how I see the world. This creative outlet helps me disconnect from the technical side of the world and gain fresh perspectives.
What advice do you have for new graduate students?
Whatever you do, do it consistently and with a purpose. Grad school will test your patience, adaptability and passion, especially when your experiments fail or your ideas take a new direction. So learn to enjoy the uncertainty. Create little rituals that keep you grounded — like coffee breaks, nature walks or a hobby you love. And remember, the journey is just as important as the destination. So, enjoy the ride while you have it.
Learn more about Thusitha's research
I study the degradation of microplastics, tiny plastic particles found in almost every part of our environment, including drinking water. My research focuses on evaluating the impact of different ultraviolet (UV) wavelengths on microplastic degradation as well as the leaching of harmful chemicals into the environment from using UV-LED (light-emitting diode) technology. My work aims to push the science forward by understanding how different polymer types respond to various UV wavelengths and doses. This knowledge will help inform strategies to address microplastic pollution.