Trials and in silico simulations to predict daily photo-oxidative capacity under solar conditions: A case study on the inactivation of an oyster pathogenic bacteria, Vibrio harveyi
2025
Blanchon, Cécile | Toulza, Eve | Calvayrac, Christophe | Stavrakakis, Christophe | Eichendorff, Stanislawa | Plantard, Gael
In today's world of increasing seafood demand, aquaculture is crucial for food security. High population densities in fish and mollusk farms often cause frequent disease outbreaks, leading to antibiotic use and genetic selection. However, emerging pathogen strains and antibiotic-resistant bacteria necessitate new bio-secure disinfection processes for aquaculture water. Current systems rely on filtration and UVC treatments, but Advanced Oxidation Processes (AOPs) present a promising solution for eliminating contaminants in seawater. While abiotic decontamination via photocatalysis is well-studied, biotic disinfection, particularly in seawater, remains underexplored. Heterogeneous photocatalysis effectively removes microbial and chemical contaminants, such as toxins, from seawater. This study aimed to assess the capacity of a solar photo-oxidation reactor for aquaculture water treatment plants. We defined and tested an inactivation kinetic law representing bacterial concentration changes for the oyster pathogen Vibrio harveyi. A kinetic model with orders of 1.23 for V. harveyi and 0.23 for flux density was selected. Photo-oxidation capacities were simulated under various reactor operating conditions using solar irradiation data from three French aquaculture sites, accounting for meteorological and seasonal variations. To address flux density variations caused by cloud cover and daily cycles, the flow rate was adjusted to ensure constant pathogen concentration at the reactor outlet. Results show that UV/TiO₂ disinfection effectively inactivates V. harveyi-contaminated seawater, offering scalable, sustainable solutions for aquaculture biosecurity.
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