Examinando por Materia "ORGANIC MATTER"

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  • Miniatura
    PublicaciónAcceso abierto
    Estudio comparativo de la remoción de materia orgánica en humedales construidos de flujo horizontal subsuperficial usando tres especies de macrófitas
    (2013-11-21) Montoya, J. I. (Jorge Ignacio); Ceballos, L. (Leonardo); Casas, J. C. (Juan Carlos); Morató, J. (Jordi)
    Constructed wetlands appear at the present time like a promising technology in reducing the pollution by waste waters; this study investigated the organic matter removal with synthetic waste water, in terms of chemical oxygen demand (COD), biological oxygen demand (BOD5) and in situ measurements of pH, oxygen and temperatura every 15 days, during three months, in six horizontal subsurface-flow constructed wetland systems, in pilot scale, seeded with three different macrophytes: Canna limbata, Heliconia psittacorum and Phragmites sp; the average removals of COD were of 97,31 % and 95,94 % for Canna limbata; 94,49 % and 93,50 % for Heliconia psittacorum; 97,39 % and 97,13 % for Phragmites sp. In BOD they were of 100 % and 99,36 % for Canna limbata; 99,09 % and 97,49 % for Heliconia psittacorum; 100 % and 99,45 % for Phragmites sp. We conclude that there are significant differences in DQO removal between different plants (P < 0,05); in BOD5 removal significant differences between the different plants do not exist statistically (P < 0,05). This study demonstrates the option to reduce the polution from organic matter using constructed wetlands.
  • Miniatura
    PublicaciónAcceso abierto
    Respirometría de Phragmites australis en presencia de materia orgánica disuelta y el xenobiótico clorotalonilo
    (2013-11-08) Serna, J. P. (Juan Pablo); Casas, J. C. (Juan Carlos); Peñuela, Gustavo A. (Gustavo Antonio); Aguirre, Néstor Jaime
    The respiratory rate of Phragmites australis exposed to synthetic sewage water (SSW) and chlorothalonil (CLT) was evaluated using a respirometer. The study was divided into two phases with the following treatments: phase I with a) tap water, b) tap water + P. australis, c) ARS; phase II with a) SWW+ CLT (0,29 mg L-1), b) SWW + CLT (2,18 mg L-1), c) CLT (0,29 mg L-1), d) CLT (2,18 mg L-1). Each experiment was done by replicate. The influence of relative humidity (RH), solar radiation (SR), air temperature (T), barometric pressure (BP), evaporation and potential evapotranspiration (ETo) on P. australis respiration rate was analyzed. No significant differences were found on the respiratory rate of P. australis (p < 0.05) using tap water and SWW during phase I experiments; the same finding was seen for all phase II experiments. Meteorological variables affected the respiratory rate in all treatments. ETo, T and SR showed significant positive correlation with respiratory rate; RH and BP, a negative correlation.