Browsing by Subject "Membrane processes"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Publication
    Open Access
    Application of reverse osmosis to remove aniline from wastewater
    (Elsevier B.V., 2009) Gómez, J.L.; León, G.; Hidalgo Montesinos, Asunción María; Gómez, M.; Murcia Almagro, María Dolores; Griñán, G.; Ingeniería Química
    The presence of organic toxic solutes in industrial wastewater is a common environmental problem. Aniline is known to be a harmful and persistent pollutant and its presence in wastewater requires treatment before disposal. The performance of reverse osmosis to remove aniline from aqueous solutions is studied in this paper. The study has been carried out in a flat membrane test module using three thin layer composite membranes, two of polyamide, HR98PP and SEPA-MS05, and one of polyether sulphone, DESAL-3B. Recycling of both concentrate and permeate has been carried out in order to keep the feed concentration practically constant and so simulate a continuous process in a quasi-stationary state. The influence of different operational variables (pressure, feed volumetric flow rate, feed concentration and pH) on the performance of the aniline removal process is analyzed.
  • Thumbnail Image
    Publication
    Open Access
    Nanofiltration membranes to reduce phenol concentration in wastewater
    (Elsevier B.V., ) Bódalo, A.; Gómez, E.; Hidalgo Montesinos, Asunción María; Gómez, M.; Murcia Almagro, María Dolores; López, I.; Ingeniería Química
    Physical, chemical and biological methods have been described to remove phenolic compounds. None of them are the definitively solution of the environmental problem caused by the discharge of this pollutants. Hybrid processes that combine pressure driven membrane processes with adsorption processes have been developed. Our research group studied the removal of phenol with three reverse osmosis membranes, the rejection percentages obtained were very low (40%), besides this parameter increases when the operating pressure decreases. For this reason, in this paper, a study of phenol removal from aqueous solutions by nanofiltration using different experimental conditions (feed phenol concentration, pressure and pH) and different membranes (NF-97, NF-99 and DSS-HR98PP) is carried out. Water permeability coefficients were also obtained. The best results are obtained with DSS-HR98PP membrane increasing the rejection percentage up to 80%.