Browsing by Author "Mendes, Marta"
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- Assessment of drying conditions of a yeast-based solution for application on textile industrial wastewater treatment plantsPublication . Mendes, Marta; Cassoni, Ana C.; Moreira, Patrícia; Pintado, Manuela; Castro, Paula ML
- Assessment of drying conditions of a yeast-based solution for application on textile industrial wastewater treatment plantsPublication . Mendes, Marta; Cassoni, Ana C.; Moreira, Patrícia R.; Pintado, Manuela E.; Castro, Paula M. L.
- Bioaugmentation of aerobic granular sludge with dye-decolorizing yeast for textile industrial wastewaterPublication . Mendes, Marta; Moreira, Irina S.; Moreira, Patrícia; Pintado, Manuela; Castro, Paula M. L.A sequencing batch reactor (SBR) inoculated with activated sludge and bioaugmented with a dye-decolorizing yeast strain—Yarrowia lipolytica (HOMOGST27AB) was assembled to form yeastbioaugmented aerobic granular sludge (AGS). The bioaugmented AGS-SBR was operated for the treatment of synthetic saline wastewater (12 g L1) intermittently fed with a reactive textile dye (Navy Everzol ED) at 25, 15, and 7.5 mg L1. Dye degradation did not occur, although some dye adsorbed to the granules. AGS-SBR performance in removing carbon and nitrogen was good and was not affected by the dye addition. Bioaugmentation with the yeast Y. lipolytica (HOMOGST27AB) occurred with success, proved by sequencing samples from granules throughout the reactor operation. The AGScore microbiome gathered essentially microorganisms from the Proteobacteria and Bacteroidetes phyla.The microbial profile showed a dynamic microbiome established at Phase I of the operation, with ahigh decrease in the abundance of Ignavibacterium from the initial biomass to the granules formedand an increase in Actinobacteria, Cytophagia, Flavobacteria, and Alphaproteobacteria in the remainingphases of the bioreactor operation.
- Bioaugmented aerobic granular sludge reactor with a dye-decolorizing yeast for dye removal from textile industry wastewaterPublication . Mendes, Marta; Moreira, Irina S.; Moreira, Patrícia R.; Pintado, Manuela; Castro, Paula M. L.Textile industry is a worldwide economic activity that generates high volumes of harmful effluents used in fabric processing that are discharged in the environment causing potential damages to the aquatic ecosystems [1]. These discharged effluents loaded with synthetic dyes, salt and other chemicals, are resistant to biodegradation and persistent in water, and are responsible for toxicity and mutagenic effects on the aquatic life [2]. Biological methods are generally considered more environmentally friendly and of major relevance [3]. Therefore, biological alternatives to aid the decolorization of dyes in textile wastewaters need to be implemented. Aerobic granular sludge (AGS) technology has excellent potential in biodegradation of many pollutants, due to the anoxic/anaerobic zones within granules and their increased tolerance to toxicity [4]. The aim of this study is to assess the effectiveness of decolorization of textile effluents using a bioaugmented aerobic granular sludge reactor. A proved decolorizing yeast, isolated from a textile wastewater treatment plant, was selected for its dye decolorization capacity, and used to bio augment the bioreactor while forming the granules from activated sludge. The incorporation of the yeast with the granules was followed by plating and following the yeast within the microbial community. A commonly used textile azo dye was added to the reactor to follow the biodegradation by the bioaugmented aerobic granular sludge and the efficiency of the process in decolorizing the effluent at varying operational parameters was followed to assess if this is a solution for a safer discharge of such effluents.
- Bioaugmented aerobic granular sludge reactor with a dye-decolorizing yeast for dye removal from textile industry wastewaterPublication . Mendes, Marta; Moreira, Irina; Moreira, Patrícia; Pintado, Manuela; Castro, PaulaTextile industry is a worldwide economic activity that generates high volumes of harmfuleffluents used in fabric processing that are discharged in the environment causing potentialdamages to the aquatic ecosystems [1]. These discharged effluents loaded with synthetic dyes,salt and other chemicals, are resistant to biodegradation and persistent in water, and areresponsible for toxicity and mutagenic effects on the aquatic life [2]. Biological methods aregenerally considered more environmentally friendly and of major relevance [3]. Therefore,biological alternatives to aid the decolorization of dyes in textile wastewaters need to beimplemented. Aerobic granular sludge (AGS) technology has excellent potential inbiodegradation of many pollutants, due to the anoxic/anaerobic zones within granules and theirincreased tolerance to toxicity [4].The aim of this study is to assess the effectiveness of decolorization of textile effluents using abioaugmented aerobic granular sludge reactor. A proved decolorizing yeast, isolated from atextile wastewater treatment plant, was selected for its dye decolorization capacity, and usedto bioaugment the bioreactor while forming the granules from activated sludge. Theincorporation of the yeast with the granules was followed by plating and following the yeastwithin the microbial community. A commonly used textile azo dye was added to the reactor tofollow the biodegradation by the bioaugmented aerobic granular sludge and the efficiency ofthe process in decolorizing the effluent at varying operational parameters was followed to assessif this is a solution for a safer discharge of such effluents.
- Decolorization of textile dyes and effluents by a selected yeast and preliminary characterization of the product metabolitesPublication . Cassoni, Carolina; Mendes, Marta; Moreira, Patrícia; Castro, Paula; Pintado, Manuela
- Evaluation of decolourisation of reactive dyes by selected yeasts and related enzymatic activityPublication . Mendes, Marta; Cassoni, Carolina; Moreira, Patrícia; Castro, Paula; Pintado, Manuela
- Innovative approach for decolorizing textile effluents using yeast-alginate capsulesPublication . Mendes, Marta; Cassoni, Ana C.; Moreira, Patrícia; Pintado, Manuela; Castro, Paula M. L.Textile industry is an economic activity that produces high volumes of effluents used in fabric processing that are discharged in the environment [1]. These discharged effluents loaded with synthetic dyes and other chemicals, are resistant to biodegradation and persistent in water, and are responsible for toxicity and mutagenic effects on the aquatic life, causing a potential risk to the aquatic ecosystems [2]. Traditionally, industry uses classic chemical methods to treat these effluents that are expensive and potentially harmful, since it could further generate large quantities of toxic by-products that are also difficult to eliminate [3]. In order to aid and complement the traditional wastewater treatment, a yeast-based solution for decolorization of textile industrial wastewater is under evaluation. This research aims to develop a new and innovative biological solution for the effective decolorization of the textile effluents usingalginate-calcium capsules filled with a proven decolorizing yeast.
- Microwave-assisted extraction in goji berries: effect on composition and bioactivity, evaluated through conventional and nonconventional methodologiesPublication . Carvalho, Ana P.; Mendes, Marta; Moreira, Manuela M.; Cruz, Diana; Magalhães, Júlia M. C. S.; Barroso, M. Fátima; Ramalhosa, M. J.; Duarte, Abel; Guido, Luís; Gomes, Ana M. P.; Matos, Cristina DelerueThis study aimed to evaluate the effect of microwave-assisted extraction (MAE) parameters on the composition and bioactivity of goji (Lycium barbarum) extracts. Extracts were obtained under a central composite design combination of experimental conditions, and characterised through HPLC-DAD; their bioactive capacity was ascertained for antimicrobial and antioxidant capacity, the later by spectrophotometric [2,2-azinobis (3- ethylbenzothiazoline-6-sulfonic acid) diammonium salt-radical scavenging activity assay – 413–748 mg ascorbic acid equivalents/100 g DW and oxygen radical absorbance capacity – 1901–2292 mg trolox equivalents/ 100 g DW] and electrochemical (DNA-based sensor – 3571–6602 mg ascorbic acid/100 g DW) methods. The quantitative profile of phenolic compounds was strongly dependent on MAE conditions. Significant correlations were found between the presence of several flavonoids and solvent composition, as well as between phenolic acids with methoxy group and the response to DNA-based sensor. Results may improve targeted extractions for specific compounds, leading to the achievement of extracts richer in antioxidant capacity, as well as in the tailoring of the biosensor response sensitivity to the composition of the extracts under analysis.
- Preliminary evaluation of decolourisation of procion and everdirect dyes by yeastsPublication . Mendes, Marta; Moreira, Patrícia; Castro, Paula; Pintado, Manuela