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University of Brighton student collaborates with South East Water on pesticide prevention in local rivers

PhD student Graihagh Guille teams with South East Water on research to reduce pesticide pollution in freshwater ecosystems

3 February 2025

PhD student Graihagh Guille is leading an innovative study to examine how pesticide combinations affect aquatic ecosystems, with a particular focus on the Ouse and Cuckmere rivers—key water sources for the South East. The research, supported by South East Water, aims to provide critical data to inform environmental policy and improve waterway management.

Pesticide pollution is a major driver of freshwater species decline worldwide, posing a significant threat to biodiversity. Sensitive aquatic organisms face the greatest risk from chemical exposure, while water companies must invest in costly and resource-intensive treatments to remove pesticides from drinking water.

PhD student conducts South East Water funded research in river

The University of Brighton research explores how pesticide mixtures impact the Asian Clam (Corbicula fluminea)—an invasive species and key environmental indicator. Understanding the effects of different pesticide concentrations on this species will help identify the most harmful chemical combinations, offering valuable insights for conservation efforts and sustainable water management.

University of Brighton PhD student Graihagh Guille said: “The financial and personal support I received from South East Water was invaluable for my PhD project.

“The access to water quality data provided by the company was a key component in the success of the study, and the contributions from all involved ensured that the study reached its maximum potential.

“The genuine interest and importance of the project to the team was evident, and I am extremely grateful for the opportunity to work alongside them. We highlighted the importance of considering how different pesticide mixtures might vary in their impact on ecology.”

South East Water’s Surface Water Manager, Simon Lohrey, said: “This sponsorship reflects our commitment to safeguarding both the environment and the quality of water we supply.

“By supervising groundbreaking research like this, we’re helping to address a root cause of biodiversity loss while ensuring our water resources remain clean and sustainable.

“The findings from this research will have far-reaching benefits. The project will help protect freshwater biodiversity for the environment, ensuring ecosystems remain resilient. For drinking water quality, cleaner rivers mean fewer containments in water supplies, reducing the need for costly, intensive treatment processes.

“The support for the student marks a significant step forward in the fight against pesticide pollution and reflects South East Water’s ongoing mission to be a guardian of the environment.”

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