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Advisor(s)
Abstract(s)
The occurrence of antibacterial agents in natural environment had recently received growing concern due to potential adverse effects on human health and aquatic ecosystems. Florfenicol (FF) is a synthetic phenicol antibiotic, widely used in veterinary medicine for treating diverse infections, and inevitably released into the environment, either from uneaten medicated pelleted feed or through urinary, branchial, and fecal excretion. This is one of the few approved antibiotics for use in aquaculture during both production and processing operations, mainly to prevent and treat bacterial diseases.
Up to now, removal of FF has been mainly reported using physical-chemical processes but its removal by biological processes is scarce. Considering that many species of bacteria and microalgae can grow in a wide variety of wastewaters and industrial effluents and have been proven to be efficient in removing nitrogen, phosphorus and other pollutants, there is a niche opportunity to use those microorganisms in bioremediation processes.
In this study, the potential of bacteria and microalgae, some isolated from a fish farm, to deal with FF was evaluated. Biodegradation of FF was assessed in batch mode in the presence of a conventional carbon source. Labrys portucalensis F11 could degrade ca. 36% of FF, initially supplied at 12 µM, releasing about 24% of fluoride ion. Several microalgae strains were isolated from sludge and water collected in a fish farm using different nutrient media Screening of microalgae able to cope with FF toxicity is under evaluation using a disc-diffusion type bioassay.
Microorganisms able to deal with FF are suitable for application in bioremediation processes towards more efficient biological removal processes.
Description
Keywords
Microalgae Bacteria Bioremediation Florfenicol
Pedagogical Context
Citation
Amorim, C.L.; Couto, A.T.; Castro, P.M.L. (2018) Screening of bacteria and microalgae for bioremediation of florfenicol in aquaculture water streams. In 12th Symposium of the European Society of Biochemical Engineering Sciences – ESBES2018: Lisboa, Portugal, 9 Setembro 2018