Examinando por Materia "DESCONTAMINACIÓN"

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  • Miniatura
    PublicaciónAcceso abierto
    Diseño de un sistema de biofiltración para la remoción de estireno
    (2014-05-07) Jimenez-Roldan, E. (Esteban); Villegas, A. M. (Ana María)
    This work was focused on developing an elimination process of styrene, an organic compound generating complex odors in air, through the design and construction of a biofiltration system, utilizing bacteria of the Pseudomona aeruginosa and Escherichia coli types stuck on a pumice stone support. Air was contaminated with styrene, in concentrations above the American Standard (TLV 40 ppm, ACGIH Worldwide, 2002), to simulate a hazardous work environment to the human health. To evaluate the efficiency of the system, the contaminated inlet air as well as the outlet flow were analyzed by taking direct styrene concentrations measurements with an organic vapor meter. Initially, the results obtained from the styrene degradation were above 55%, for a five-daily-sampling average during 10 days. This percentage was a consequence of the progressive stabilization process of the system within the first days, so the removal was low. However, average removals above 70% and punctual removals above 90% were reached after the eighth day. The pumice stone support demonstrated to be a good alternative to improve biofilm formation; the rapid micropore saturation guaranteed low adsorption of the organic compound and confirmed the elimination of styrene via biodegradation.
  • Miniatura
    PublicaciónAcceso abierto
    Remoción de níquel y DQO presentes en las aguas residuales de la industria automotriz mediante electrocoagulación
    (2013-10-22) Gonzalez-Silva, G. (German); Valencia, S. H. (Sergio Humberto)
    By means of this study was determined if the electrocoagulation technique helps to minimize the nickel and organic matter, chemical oxygen demand (COD) concentration, present in wastewaters from automotive industry. A randomized multilevel factorial experimental design was used; being the current density and reaction time evaluated in three levels, while the separation between electrodes was analyzed at two levels. Electrocoagulation was carried out in a batch reactor using iron electrodes with monopolar arrangement. The acid digestion, atomic absorption air-acetylene flame and the closed reflux-colorimetric (micro COD) analytical techniques were used to determine the content of the contaminants. The conditions where it got the most decontamination of the water analyzed were found; being the Applied current density: 1,04 A/dm2, operative time: 17 minutes y; did not the electrode separation influence. The results show that electrocoagulation could be effective to reduce nickel and organic matter (COD) present in wastewaters from automotive industry.