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Yi Cai

PhD Student

Yi Cai

Profile

PhD project: Effects of aqueous dissolved matter on photodegradation of biocides from antifoulings

University: Aarhus University
Department: Department of Environmental Science

Section: MITO

Research group: Kai Bester
Supervisor:  Kai Bester & Ulla E. Bollmann

Master’s degree: MSc in Environmental engineering, specialization in treating wastewater by using the photocatalytic method. Chang’an University, China.

 

BACKGROUND

Antifouling paint biocides are used to prevent the colonization of boat hulls by organisms, e.g., algae and seaweed. These biocides can be mobilized by direct release from the paint surface during normal use and by pressure hosing of pleasure craft hulls directly onto the foreshore (marina). Hence, the slurry of wash-down water and antifouling paint particles are discharged directly into marine systems. The used biocides are toxic to aquatic organisms and may cause long-term adverse effects in the aquatic environment. Therefore, it is essential to understand their occurrence and potential ecological risks in the receiving environment. Besides hydrolysis and microbial degradation, photolysis is considered to be a relevant removal process of these compounds from the environment.

AIM

1) Explore the transformation products of different antifouling biocides in the lab and under natural conditions.

2) Investigate their photodegradation kinetics, phototransformation products, pathways and mechanisms;

3) Elucidate the effects of main aqueous environmental factors on the photodegradation so as to better understand their environmental photochemical behavior.

ID: 115872721