Navegando por Autor "Matos, Antonio Teixeira De"
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Item Efficiency of constructed wetland systems cultivated with black oats treatment of domestic sewage(Acta Scientiarum. Technology, 2011-09-29) Eustáquio Júnior, Valdeir; Matos, Antonio Teixeira De; Monaco, Paola Alfonsa Vieira Lo; Campos, Lidiane Carvalho De; Borges, Alisson CarraroThe objective of the present work was to evaluate the efficiency of a constructed wetland system cultivated with black oat (Avena strigosa Schreb) for the treatment of domestic sewage effluent from a septic tank, with emphasis on removal of carbonaceous matter, nutrients (N, P and K) and sodium. The experiment was conducted in four constructed wetland system (CWS) with horizontal subsurface flow for secondary/tertiary treatment domestic sewage. The CWS 1, 2, 3 and 4 received, respectively, organic load rates (OLR) of 100, 200, 400 and 600 kg ha-1 day-1 of BOD. Average efficiencies for removal of BOD, COD, total nitrogen, phosphorus, sodium and potassium were, respectively, 69.5, 70.2, 17.8, 26.2, 14.9 and 16.6%. Low efficiency in the removal of nutrients (N, P and K) was due a high OLR applied which provided also a large input of nutrients to the system. Sodium removal efficiency was low because it is a highly soluble ion and is poorly absorbed by plants. In general, lower OLR result in greater pollutant removals from the domestic sewage.Item Filtration rates in inorganic filters submitted to different repose periods(Acta Scientiarum. Agronomy, 2012-01-23) Teixeira, Denis Leocádio; Matos, Antonio Teixeira De; Monaco, Paola Alfonsa Vieira Lo; Eustáquio Júnior, Valdeir; Baker, Sandy Athaíde ArcherThis work aimed to evaluate the filtration rate in organic filters after being subjected to different repose periods in the primary treatment of swine wastewater (SWW). Filtration columns were mounted in PVC pipes measuring 100 mm in diameter and 600 mm in length and filled with 2-5 mm sawdust particles. Five different repose periods were evaluated: 1, 2, 4, 8 and 16 days after the first filtration, carrying out three batches. The SWW filtration rate decreased with the operating time of the filters, which can be attributed to clogging of pores resulting from high concentrations of suspended solids (SS) present in this type of wastewater. In the three batches, it was observed that the repose periods of 1, 2 and 4 days were not sufficient to unclog the pores, however, repose periods of 8 and 16 days for the filter medium resulted in increases of the filtration rate, only 59 and 72% of the initial rate, respectively.