The Use of Aquatic Macrophytes as a Nature-Based Solution to Prevent Ciprofloxacin Deleterious Effects on Microalgae
Rafael Shinji Akiyama Kitamura | Tayna Fusaro | Raizza Zorman Marques | Julio Cesar Moreira Brito | Philippe Juneau | Marcelo Pedrosa Gomes
Macrophytes have demonstrated excellent potential for the removal of pharmaceuticals from water. However, there is a lack of studies on the ecotoxicity of water after phytoremediation. In this study, we evaluated the toxicity of ciprofloxacin (Cipro) on the microalgae cells of <i>Desmodesmus subspicatus</i> exposed to water contaminated with Cipro and previously treated by <i>Salvinia molesta</i> or <i>Egeria densa</i> for 96 h. Microalgae exposed to Cipro (1, 10, and 100 µg L<sup>−1</sup>) in untreated water showed decreased rates of growth, respiration, and photosynthesis, and increased oxidative status (hydrogen peroxide concentration) and oxidative damages (lipid peroxidation). <i>S. molesta</i> exhibited a greater phytoremediation capacity than <i>E. densa</i>, reducing Cipro concentrations in water to below its toxic threshold to <i>D. subspicatus</i> (2.44 µg L<sup>−1</sup>), even when the antimicrobial was present at a concentration of 10 µg L<sup>−1</sup>. During the water treatment, neither <i>S. molesta</i> nor <i>E. densa</i> released compounds that had a toxic effect on <i>D. subspicatus</i>. This work demonstrates the novelty of using <i>S. molesta</i> and <i>E. densa</i> as a nature-based solution to remove Cipro from contaminated water. For the first time, we provide evidence of the ecotoxicological safety of this approach, as it prevents the deleterious effects of Cipro on photosynthetic microorganisms and helps to avoid the development of antimicrobial resistance.
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