131 documents found, page 1 of 14
Desafios e soluções na gestão de águas residuais têxteis: Uma abordagem biológica
Barbosa, Sónia G.; Nicolau, Ana; Silva, Ana R.; Salvador, Andreia Filipa Ferreira; Soares, Olívia S. G. P.; Pereira, Manuel Fernando R.; Gonçalves, AnaOs processos da indústria têxtil consomem grandes volumes de água e geram efluentes resistentes aos processos de tratamento convencionais. Uma gestão eficaz da água requer tecnologias de tratamento que enfrentem a complexidade e variabilidade dos efluentes, assegurando qualidade para reutilização em processos húmidos. Neste estudo testaram-se tratamentos biológicos anaeróbios e aeróbios, suplementados com 2 tip...
Biocidal effect of triclosan, glutaraldheyde and CTAB on activated sludge micro...
Ferreira, Vânia Isabel Lopes; Mota, M.; Pereira, Maria Olívia; Nicolau, AnaMixed liquor and real sewage were collected from three wastewater treatment plants, the biocides effect being initially assessed in respirometric assays. The biocide effect was also assessed in bench-scale trials, but, in this case, with mixed liquor and real sewage from only one WWTP. In the respirometric assays, all biocides showed a dose-dependent effect in the inhibition of microbial biomass respiration. In...
In-vitro assessment of biocides effect on two activated-sludge filamentous bact...
Ferreira, Vânia Isabel Lopes; Dias, Nicolina M.; Mota, Manuel; Pereira, Maria Olívia; Nicolau, AnaWastewater treatment is the world largest biotechnology in the world and stands for the defense of public health on one side and the protection of the natural aquatic ecosystems on the other. Activated-sludge process (AS) is the most widely used technique for wastewater treatment. The AS bacterial communities include floc-forming and non-floc-forming organisms, the latter mostly filamentous bacteria. AS goals o...
Negative impacts of cleaning agent DEPTAL MCL® on activated sludge wastewater t...
Padrão, Jorge; Ferreira, Vânia; Mesquita, Daniela P.; Cortez, Susana Maria Ribeiro; Dias, Nicolina Marques; Duarte, Maria Salomé Lira; Tortella, GonzaloDEPTAL MCL® is a professional cleaning agent approved by the Portuguese Food Regulatory Authority and is used in agro-food industries, namely in fish canning industries in the north of Portugal. Its extensive use during cleaning procedures results in potential significant negative impacts on the performance of the downstream municipal wastewater treatment plant (WWTP). A lab-scale extended areation activated sl...
Bacteriophages have potential to control foaming caused by Rhodococcus erythrop...
Ferreira, Rute Vanessa Novais; Santos, Sílvio Roberto Branco; Melo, Luís Daniel Rodrigues; Ferreira, Vânia; Mota, M.; Nicolau, AnaActivated-sludge is the most widely used biological process to remove pollutants from wastewater worldwide, mainly due to its economic advantages. Bacteria sum up around 95 % of the total microbial community of the activated-sludge, being responsible for most of the water depuration. Filamentous bacteria are normal components of these artificial ecosystems but their excessive growth leads to potential problems,...
Exploring electroactive microenvironments in polymer-based nanocomposites to se...
Moreira, Joana; Fernandes, Margarida Maria Macedo; Carvalho, E. O.; Nicolau, Ana; Lazic, V.; Nedeljković, J. M.; Lanceros-Méndez, S.The search for alternative antimicrobial strategies capable of avoiding resistance mechanisms in bacteria are highly needed due to the alarming emergence of antimicrobial resistance. The application of physical stimuli as a mean of sensitizing bacteria for the action of antimicrobials on otherwise resistant bacteria or by allowing the action of low quantity of antimicrobials may be seen as a breakthrough for su...
The first sequenced Sphaerotilus natans bacteriophage- characterization and pot...
Ferreira, Rute Vanessa Novais; Amado, R.; Padrão, Jorge; Ferreira, V.; Dias, Nicolina M.; Melo, Luís Daniel Rodrigues; Santos, Sílvio Roberto BrancoBacteriophages (phages) are ubiquitous entities present in every conceivable habitat as a result of their bacterial parasitism. Their prevalence and impact in the ecology of bacterial communities and their ability to control pathogens make their characterization essential, particularly of new phages, improving knowledge and potential application. The isolation and characterization of a new lytic phage against S...
Isolation and characterization of a new bacteriophage against Rhodococcus eryth...
Ferreira, Rute Vanessa Novais; Santos, Sílvio Roberto Branco; Pacheco, Maria Inês Costa; Ferreira, Vânia; Melo, Luís Daniel Rodrigues; Nicolau, AnaActivated-sludge is the most common biotechnology to treat wastewaters. In the aerating tank of these systems, a true ecosystem develops, being bacteria the key play-ers in the depuration process. Frequently, filamentous bacteria grow exaggeratedly, being the source of two well phenomena that cause significant throwbacks in the process: bulking and foaming. (Rhodococcus eryth-ropolis) is a gram positive filamen...
Tailoring bacteria response by piezoelectric stimulation
Carvalho, Estela Marisa Oliveira; Fernandes, Margarida Maria Macedo; Padrão, Jorge; Nicolau, Ana; Marqués-Marchán, Jorge; Asenjo, Agustina; Gama, F. M.Bacteria are simple organisms with a remarkable capacity for survival by adapting to different environments, which is a result of their long evolutionary history. Taking into consideration these adapting mechanisms, this work now investigates the effect of electrically active microenvironments on bacteria and on how this stimulation may trigger bacteria growth inhibition or proliferation. Electrical microenviro...
Toxicity assessment of ibuprofen on activated sludge by respirometric technique
Melo, A. R. B.; Padrão, Jorge; Nicolau, Ana; Quintelas, Cristina; Ferreira, Eugénio C.; Mesquita, D. P.Micropollutants, including pharmaceuticals, have gained wide attention and concern due to the widespread usage and growing presence in aqueous systems. Activated sludge systems are widely used for wastewater treatment, being one of the processes that present greater efficiency for the removal of pharmaceuticals. The presence of these compounds affects the performance of the biological processes in wastewater tr...