Browsing by Issue Date, starting with "2009-12"
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- Submarine Cascais Canyon as a sediment conduit to the deep sea : comparison with adjacent slopesPublication . Costa, A. M.; Mil-Homens, Mário; Lebreiro, Susana; De Stigter, H.; Richter, T.; Boer, Wim; Trancoso, Maria Ascensão; Melo, Zenaida; Mouro, F.; Mateus, MSubmarine canyons are known to be important conduits that trap, accumulate and deliver both natural and anthropogenic sediments from the shelf to the deep sea. Ten multi-cores from the Cascais Canyon and from the neighbour slopes (off Estremadura and Sines) were dated by 21Opb methodologies and analyzed for texture, major and trace metals to evaluate the role of submarine canyons in the transport of anthropogenic metals to the abyssal plains. Higher accumulation mass rates were determined in the upper Cascais Canyon than in the lower canyon and slopes. Enrichment factors (EF) were used to evaluate the level of metal enrichment in the studied areas. EF values exceeding natural background concentrations were obtained for Pb suggesting an anthropogenic and/or diagenetic source for Pb enrichment in the Cascais Canyon, but also, to a lesser extent, in the Estremadura and Sines slopes. Studies of provenance based on the ratio of different stable Pb isotopes can help to determinethe origin of such metal in the sediments.
- Surface water hydrography in the Mid-Latitude North Atlantic (IODP Site U1313) from 480-355 ka : observations from calcareous nannoplanktonPublication . Kulhanek, D. K.; Voelker, Antje H. L.; Gruetzner, D. J.
- Alterações recentes nas razões isotópicas de Pb em sedimentos do Canhão Submarino de Cascais, PortugalPublication . Mil-Homens, Mário; Caetano, M.; Lebreiro, Susana; Costa, A. M.; Richter, T.; Cesário, R.; Brito, Pedro Oliveira; De Stigter, H.; Boer, Wim; Trancoso, Maria Ascensão; Mouro, F.Temporal variations in lead concentrations and stable lead isotopic ratios in two sediment cores from the Cascais Canyon shows changes in sources of Pb during the last two centuries. The increase of total Pb contents wIth the evolution of Pb ratio recorded in both cores reveals the Increase of Pb from industrial sources. Nevertheless, this increase is lower in deeper core location (252-32) due to dilution and mixing with uncontaminated marine materials. An isotopic shift towards lower Pb/Pb in the shallower core (252-35) during the 1970s may reflect the increasing number of vehicles in the Lisboa area during that time.
- Precise chronology of Heinrich-1 meltwater pulses in the Nordic SeasPublication . Sarnthein, Michael; Grootes, P. M.; Kuehn, H.; Voelker, Antje H. L.
- Trace and minor element/Ca ratios of planktonic foraminifera in the Iberian Margin during Heinrich eventsPublication . Patton, Genna M.; Martin, Pamela A.; Voelker, Antje H. L.
- Morphostructure of the Tore Seamount and evidences of recent tectonic activity (West Iberia Margin)Publication . Roque, Ana Cristina; Terrinha, Pedro; Lourenço, Nuno; Abreu, M. Pinto de
- Recent changes in lead isotopic signature in sediments of the Cascais Canyon (Portugal)Publication . Mil-Homens, Mário; Caetano, M.; Lebreiro, Susana; Costa, A.; Richter, T.; Cesário, R.; Brito, Pedro Oliveira; Stigter, H. de; Boer, Wim; Trancoso, Maria Ascensão; Mouro, Filomena C.
- Detection of D/N functional genes during a biotreatment of mixed olive oil and winery wastewatersPublication . Eusebio, Ana; Vaz, A.; Tacão, M.; Eusébio, M.; Ribeiro, C.; Tenreiro, R.; Almeida-Vara, Elsa
- Molecular assessment of microbial community structure and dynamic along mixed olive oil and winery wastewaters biotreatmentPublication . Eusebio, Ana; Tacão, M.; Chaves, S.; Tenreiro, R.; Almeida-Vara, Elsa
- Detoxification of olive mill wastewaters using a packed-bed batch reactorPublication . Paixão, Susana M.; Sàágua, M. C.; Baeta-Hall, Lina; Correia, Anabela; Ribeiro, Belina; 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 (OMW), which does not undergo any treatment and, usually, is stored in evaporation lagoons or spread on the land. Disposal of olive oil mill wastewaters is a serious environmental problem due to its high organic loading, presence of polyphenols and tannins, high content in suspended solids and acidity, which contributes to its ecotoxicity. In this work, a biological treatment system: a packed-bed batch reactor was applied to a Portuguese OMW using its autochthon microbial population as inoculum. Thus, the biodegradation potential of OMW’ microrganisms naturally present in these wastewaters was assessed monitoring several physico-chemical parameters along the process. Ecotoxicity tests (Pseudomonas putida growth inhibition test and Vibrio fisheri growth inhibition test) were carried out to follow the detoxification capacity of the system as well as its potential to be used in the treatment of this type of agroindustrial effluent. In this aerobic treatment, an active microbial community with high degradation ability for the OMW organic load was detected, accounting for 80%, 71% and 61% removal of COD, TSS and phenols, respectively. In addition, a significant decrease in the chronic toxicity of the treated OMW to both bacteria, V. fisheri (62.8%) and P. putida (64.3%), was also observed after 140 days of treatment, highlighting the detoxification potential of the system studied