UB - Resumos em livros de actas
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- Characterisation of a microbial consortium involved in the winery effluent bio-treatmentPublication . Eusebio, Ana; Mateus, Marta; Baeta-Hall, Lina; Almeida-Vara, Elsa; Duarte, José Cardoso
- Microflora evaluation on aerobic treatment of olive oil wastewaterPublication . Eusebio, Ana; Mateus, Marta; Baeta-Hall, Lina; Almeida-Vara, Elsa; Duarte, José Cardoso
- TGGE analysis of microbial consortia in JACTO bioreactors treating winery and olive oil wastewatersPublication . Eusebio, Ana; Gadanho, M.; Tenreiro, R.; Almeida-Vara, Elsa; Duarte, José Cardoso
- Assessment of a winery effluent microbial community dynamics by LH-PCR/DGGE analysisPublication . Eusebio, Ana; Tacão, M.; Chaves, S.; Gadanho, M.; Duarte, José Cardoso; Almeida-Vara, Elsa; Tenreiro, R.
- Sulphate reducing bacteria for metals bioremediationPublication . Duarte, José Cardoso; Sàágua, M. C.; Paixão, Susana M.; Baeta-Hall, Lina; Costa, Clara
- Kinetics of a packed-bed bacth reactor for the treatment of olive oil wastewaters from a Portuguese millPublication . Ribeiro, Belina; Correia, Anabela; Paixão, Susana M.; Baeta-Hall, Lina; Sàágua, M. C.; Duarte, José CardosoOlive oil production is a traditional agricultural industry in Mediterranean countries and Portugal is one of the ten major producers. This industry generates an effluent, olive mill wastewater. This effluent does not undergo any treatment and is usually stored in evaporation lagoons or spread on the land. This can have a negative impact in the environment since this effluent has a high level of organic matter leading to a high chemical oxygen demand. In addition it has also a high content of polyphenols that contributes to the ecotoxicity of this effluent.Different techniques for the treatment of these wastewaters have been studied. In this work a 60 litre vessel was filled with a packaging of plastic material consisting of a cubic geometry (Biological Carrier Media from Rauschert). The non-inoculated reactor was filled with effluent from an olive mill farm (from Alfândega da Fé, Trás-os-Montes) and the effluent was re-circulated daily for homogeneity. COD, colour, nitrogen, solids and phosphorous were measured to follow the evolution of the system. Microbial composition and polyphenols were also evaluated. As an indicator of the microbial activity in the reactor, lipase activities were measured. Ecotoxicity tests were carried out to follow the detoxification capacity of the system as well as its potential for using in the treatment of this type of agroindustrial effluent.
- Metals recovery from mine lead concentrates:screening of bioleaching microbial communitiesPublication . Duarte, José Cardoso; Sàágua, M. C.; Paixão, Susana M.; Baeta-Hall, Lina; Nogueira, Carlos; Pereira, Paula Sá; Anselmo, Ana
- Functional screening of a metagenomic library obtained from soils water of S. Domingos's minePublication . Pereira, Paula Sá; Baeta-Hall, Lina; Sàágua, M. C.; Paixão, Susana M.; Duarte, José Cardoso; Anselmo, Ana
- Selection of indigenous acidophilic bacteria for the bioleaching of two SOMINCOR concentratesPublication . Paixão, Susana M.; Nogueira, Carlos; Baeta-Hall, Lina; Sàágua, M. C.; Pereira, Paula Sá; Duarte, José Cardoso; Anselmo, Ana
- Sulphate-reducing bacteria from mining environments for metals bioremediationPublication . Paixão, Susana M.; Baeta-Hall, Lina; Barreiros, M. Alexandra; Anselmo, Ana; Duarte, José Cardoso; Sàágua, M. C.Toxic heavy metals and metalloids constitute an international pollution problem that not only impacts public health but also is of environmental and economic importance. Several conventional treatment technologies for removing metals are available. These techniques, based on chemical methods of neutralisation and precipitation, even though quick and effective, present several disadvantages, such as the need for building additional treatment plants, the high cost of the chemical reagents used and the generation of an important volume of sludge which need further treatment. Prokaryotes with physiological activity of sulphate reduction are found in several environmental sites containing metals and these microorganisms have developed several different strategies for detoxification and resistance to toxic elements that are potentially useful for bioremediation. Since sulphate-reducing bacteria (SRB) are found in a large number of contaminated sites containing toxic metals, it is apparent that these organisms have a functional defence system that enables them to persist and even grow under metal stress. The enzymatic metal reduction by SRB offers an alternative to chemical processes to remediate environments containing metals. Acid mine drainage (AMD) is one of the most important source of heavy metal environmental pollution. AMD is characterised by its high acidity (≤3), high concentration of metals (e.g. Cu, Fe, Zn, A1, Pb, As and Cd) and high concentration of dissolved sulphates (≥3000 ppm). Taking advantage of the fact that SRB are present in these mining environments, several samples were collected from S. Domingos abandoned mine (Portugal) and screened for their ability to sulphate reduction, metal resistance and bioremediation. In this context, the most promising consortium of SRB (SRB no. 6) was grown in matrices column reactors, using lactate and ethanol as an electron donor source for the production of H2S from sulphates. Metal resistance was tested in batch using different metal concentration for Cu, Zn and Fe. The results obtained for this SRB inoculum, showed 97% of sulphate reduction (3750—350 mg/l) in the reactors, and a metal tolerance to Fe, Cu and Zn, at concentrations until 260 mg/l, 40 mg/l and 80 mg/l, respectively, in the batch assays, being observed a sulphate reduction (2000—0 mg/l) and a significant metals concentration decrease in the growth medium. Further studies are being carried out to apply this mining inoculum for the design of reactors for AMD bioremediation