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Ecotoxicity evaluation of tetramethrin and analysis in agrochemical formulations using chiral electrokinetic chromatography
No full textEnantiomeric separation of panthenol by Capillary Electrophoresis. Analysis of commercial formulations and toxicity evaluation on non-target organisms
No full textCurrent challenges for the advanced mass scale monitoring of Solar Home Systems: A review
No full textRecycled reverse osmosis membranes for forward osmosis technology
No full textAn alternative use of end-of-life reverse osmosis (RO) membranes is proposed for forward osmosis (FO) application as recycled FO (RFO) membranes and transformed recycled FO (TRFO) membranes. Different passive cleaning protocols in pilot plant and laboratory scale were followed using sodium hypochlorite (NaClO) at different concentrations and exposure time. The RFO with the best performance was selected for its transformation by interfacial polymerization (IP) technique to improve further the FO performance. Both the morphological structure and transport properties of the RFO and TRFO membranes were studied by means of different characterization techniques. Although the RFO membranes are suitable for FO, the TRFO membranes are more competitive. The highest FO water permeate fluxes (12.21 kg/m2h and 15.12 kg/m2h) were obtained for the membrane recycled applying the highest NaClO exposure dose applied in pilot plant (106 ppm·h) followed by IP of a thin polyamide layer. These permeate fluxes were better or at least comparable to commercial membranes used under the same FO conditions. The results indicated that it is possible to use discarded RO membranes in FO technology for wastewater treatment after adequate treatment procedures extending their lifetime and contributing to a circular economy and sustainability in membrane science and related materials
Impact of chemical and microbiological water quality on bacterial community assemblage of San Juan River (Sierra del Rosario, Biosphere Reserve, Cuba)
No full textThe objective of the present study was to analyze the influence of different physicochemical and microbiological indicators on bacterial assemblages in a freshwater ecosystem located in a Biosphere Reserve. The bacterioplankton communities composition was determined by denaturing gradient gel electrophoresis (DGGE) of 16S rDNA during three sampling campaigns in three sampling stations of San Juan River. Multivariate statistical analyses of gel patterns, in relation to chemical, biological and physical parameters were performed. The analyses showed a seasonal variation of bacterial community at the less polluted stations. The correspondence canonical analysis showed that total dissolved solids (TDS), E. coli concentration and dissolved oxygen were significantly influencing the DGGE profiles at San Juan River, indicating that at least two of the three sampling stations analyzed possessed good water quality. With the combination of environmental variables and the DGGE molecular data it could be appreciated the influence of chemical and microbial contamination on the bacterial community of San Juan River. At the less polluted stations low concentrations of TDS and bacterial indicators of fecal contamination were related with bacterial diversity. The present investigation constitutes the first culture-independent analysis of freshwater bacterial communities in a Biosphere Reserve of the Caribbean islands
Use of Postregistration Monitoring Data to Evaluate the Ecotoxicological Risks of Pesticides to Surface Waters: A Case Study with Chlorpyrifos in the Iberian Peninsula
No full textAssessing population exposure to phthalate plasticizers in thirteen Spanish cities through the analysis of wastewater
No full textPreparación de membranas de intercambio iónico sobre soportes reciclados de membranas desechadas
No full textEste trabajo describe una nueva metodología para la preparación de Membranas de Intercambio Iónico utilizando como soporte diferentes componentes reciclados de un módulo de Ósmosis Inversa al final de su vida útil
