Navegando por Autor "Freitas, Mylena Gomes"
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Item Biodegradation of sulfamethoxazole by microalgae-bacteria consortium in wastewater treatment plant effluents.(2020) Rodrigues, Daniel Aparecido da Silva; Cunha, Camila Cristina Rodrigues Ferreira da; Freitas, Mylena Gomes; Barros, André Luis Corrêa de; Castro, Paulo Bernardo Neves e; Pereira, Andressa Rezende; Silva, Silvana de Queiroz; Santiago, Aníbal da Fonseca; Afonso, Robson José de Cássia FrancoSulfamethoxazole (SMX) has been commonly detected in wastewater treatment plant (WWTP) effluents. SMX and other antibiotics can be considered as environmental contaminants of emerging concern. Due to their toxicity effects and their potential for the development of bacterial resistance their presence in aquatic compartment becomes a threat to human health. This study evaluated the bioremediation of SMX in WWTP effluents using a tertiary treatment composed by microalgae-bacteria consortium under low intensity artificial LED illumination, and also the assessment of sulfonamide resistance gene (sul1). The removal of SMX from WWTP effluents were 54.34 ± 2.35%, in which the microalgae-bacteria consortium improves the removal performance of SMX. The main process of SMX removal can be attributed to the symbiotic biodegradation by bacteria due to the increase of oxygen released by the microalgae photosynthetic process. Therefore, the microalgae-bacteria consortium used in this study, demonstrated to be a promising alternative for bioremediation of SMX, with potential for removal others contaminants from wastewater effluent. However, the residual SMX and the relative abundance of antibiotics resistance genes (ARG) found in this study suggest that SMX contributes to selective pressure for ARG maintenance and proliferation inWWTP effluent. Thus, further studies to removal ARG from WWTP effluent are needed.Item Occurrence and removal of drugs and endocrine disruptors in water supply systems in the metropolitan region of Belo Horizonte -Minas Gerais State, Brazil-.(2022) Alves, Mariana Corrêa Pessato; Sanson, Ananda Lima; Quaresma, Amanda de Vasconcelos; Freitas, Mylena Gomes; Afonso, Robson José de Cássia Franco; Aquino, Sergio Francisco deThis study evaluates both the occurrence and removal of 24 compounds, including drugs and endocrine disruptors, in 8 water treatment plants (WTP) located in the metropolitan region of Belo Horizonte (Minas Gerais State, Brazil). The compounds 4-nonylphenol, 4-octylphenol, 17α-ethinylestradiol, 17β-estradiol, acy- clovir, bisphenol A, bezafbrate, cafeine, dexamethasone, diclofenac sodium, diltiazem, estrone, estriol, gemfbro- zil, ibuprofen, linezolid, loratadine, losartan, metformin, naproxen, paracetamol, promethazine, propranolol and sulfamethoxazole were monitored at 3 sampling points (raw water, fltered water, treated water) over 10 or 12 col- lection campaigns for each WTP. The results showed that bisphenol A occurred at higher concentrations during the dry period with a maximum concentration of 3257.1 ng L−1, while the compounds 4-nonylphenol and losartan exhibited higher concentrations in the rainy period with maximum concentrations of 8577.2 ng L−1 and 705.8 ng L−1, respectively. Regarding the removal of compounds in the monitored WTPs, the clarifcation step demon- strated better removals for 4-nonylphenol, bisphenol-A, paracetamol, and sulfamethoxazole, whereas the disinfec- tion step mainly removed the compounds 4-octylphenol and estrone. Margin of exposure (ME) assessment results indicated that only dexamethasone, ethinyl estradiol, diclofenac, estradiol, and estrone were classifed as immi- nent risk or alert considering the 95th percentile concen- tration found in the samples of treated water.