http://hdl.handle.net/2117/3245 2013-05-18T23:16:06Z http://hdl.handle.net/2117/18742 Title: Olis essencials de les plantes aromàtiques Authors: Grau Vilalta, Maria Dolors; Torras Grané, Josep 2013-04-09T15:20:34Z http://hdl.handle.net/2117/18265 Title: Optimization of oxygen transfer through membrane diffusers for biological sweetening of biogas Authors: Rodriguez, Ginesta; Dorado Castaño, Antonio David; Bonsfills Pedrós, Anna; Gabriel Buguña, David; Gamisans Noguera, Javier Abstract: Biological techniques for the removal of gaseous pollutants such as hydrogen sulfide (H2S) have proved to be effective, environmentally friendly, and economically viable. However, when high concentrations of H2S are treated, the process is severely restricted by the oxygen deficit in the liquid phase. The oxygen transfer efficiency provided by a membrane diffuser is evaluated under typical pressure and salinity conditions used for the biological treatment of H2S in biogas. The optimal operating parameters for enhanced oxygen transfer were determined. The addition of pure oxygen with a membrane diffuser to increase the oxygen transfer rate and the use of a nonaqueous phase to improve oxygen transfer in a bioscrubber system are also evaluated. 2013-03-13T15:12:51Z http://hdl.handle.net/2117/17934 Title: Interaction between sorption and biodegradation in a biofilter packed with activated carbon Authors: Dorado Castaño, Antonio David; Lafuente Sancho, Francisco Javier; Gabriel Buguña, David; Gamisans Noguera, Javier Abstract: The main objective of this study is to evaluate qualitatively and quantitatively the effect of starvation periods in the biodegradation capacity of microorganisms when the support media is a material with high sorption capacity. Pollutant sorption and biodegradation, which occur simultaneously in the biofilter, describe the overall behavior of the air treatment system during normal operation and during starvation periods. Results obtained in the present study demonstrate that sorption capacity of the material not only plays an important role during the start-up of operation, but it is also important in the steady operation. Simultaneously, as biomass grows on the support, biodegradation becomes more decisive in the performance. It was found that zones of packing material with low moisture content are controlled by the sorption mechanism, at expenses of biodegradation, and they are essential as pollutant reservoir during starvation periods. In the present study a significant decrease in the biodegradation capacity of microorganisms immobilized on activated carbon were not observed as consequence of continuously load interruptions. 2013-02-22T12:02:29Z http://hdl.handle.net/2117/17929 Title: Effect of pH and Fe(III) ions on chalcopyrite bioleaching by an adapted consortium from biogas sweetening Authors: Dorado Castaño, Antonio David; Solé Sardans, Maria Montserrat; Lao Luque, Concepción; Alfonso Abella, María Pura; Gamisans Noguera, Javier Abstract: Bacterial leaching of metal sulfides offers a low cost and an environmentally friendly technology for valuable metals recovering. Particle size, inoculum, pH and ferric ion affect the process of bioleaching of copper from chalcopyrite ores. In the case of low grade ores, the effect of these key parameters is critical to determine the viability of the technique. Moreover, there is not a total agreement on the optimal operation conditions to obtain high recover efficiencies of the metal. In the study presented herein a low-grade copper sulfide ore was subjected to bioleaching process using a mixed microbial consortium obtained from a biotrickling filter treating high loads of H2S. Experiments were performed comparing with bacteria from different origin, different mineral particle size, medium pH and additional ion ferric concentrations as leaching agent. After 1300 hours of operation, the total copper recovery achieves a value of 50 % in the most acidic conditions. A decrease of 2.5 units of pH implies an increase in the efficiency of 35% under these conditions. It was also observed an optimal particle size (between 2 and 3 mm), considerably higher than previous studies, meaning a decrease in operational cost to mill material. Finally, results indicate that the presence of additional ferric ion improves the performance of bioleaching but there is a threshold concentration from which the system is not sensitive (500 ppm). 2013-02-22T11:30:23Z http://hdl.handle.net/2117/17860 Title: MINROCIND una eina d’aprenentatge presencial e interactiva dels jaciments de roques i minerals industrials a Catalunya : eina d'aprenentatge presencial i/o interactiu en el àmbit dels ensenyaments de la mineralogia i petrologia aplicada Authors: Alfonso Abella, María Pura; García Vallès, Maite; Vallejo, Raquel Abstract: Es presenta un nou material didàctic elaborat per a assolir l’aprenentatge de les roques industrials. Consta d’una part física i una altra virtual. La primera està constituïda per una mostra de roca polida i la seva làmina prima, per a ser utilitzada a les pràctiques a classe o pel autoaprenentatge. La part virtual és una base de dades interactiva amb fitxes amb les característiques bàsiques de la roca, i de les seves pedreres. S’inclouen les pedreres més importants de Catalunya. Més endavant es preveu ampliar-lo a altres àrees. 2013-02-18T16:23:37Z http://hdl.handle.net/2117/17583 Title: GREDIQ-RIMA: The evolution of a teaching project of experimentation in chemistry Authors: Grau Vilalta, Maria Dolors; Guaus Guerrero, Ester; Martínez Martínez, María del Rosario; Calvet Tarragona, Aureli; Farran Marsà, Adriana; Salán Ballesteros, Maria Núria; Álvarez del Castillo, María Dolores; Gorchs Altarriba, Roser; Almajano Pablos, María Pilar; Morillo Cazorla, Margarita; Garrido Soriano, Núria Abstract: Authors of this project belong to the Resources Chemistry Teaching Group (GReDiQ) involved in RIMA (Research and innovation in learning methodologies). The audiovisual and multimedia material productions realized have been grouped into three themes: Basic Techniques of Experimentation in Chemistry, Safety in Chemistry Laboratories and Advanced Techniques of Experimentation in Chemistry. This work has been awarded a prize of the Universitat Politècnica de Catalunya (UPC–BARCELONATECH), one of the Autonomous Region of Catalunya and another one of a State scope 2013-02-05T15:33:21Z http://hdl.handle.net/2117/17074 Title: Stable isotope geochemistry of the Ulldemolins Pb-Zn-Cu deposit (SW Catalonian Coastal Ranges, Spain) Authors: Alfonso Abella, María Pura; Canet, Carles; Melgarejo Draper, Joan Carles; Mata Perelló, Josep Maria; Fallick, A. E. 2012-12-04T12:45:59Z http://hdl.handle.net/2117/16824 Title: Optimization of oxygen transfer through venturi-based systems applied to the biological sweetening of biogas Authors: Rodriguez, Ginesta; Dorado Castaño, Antonio David; Bonsfills Pedrós, Anna; Sanahuja Moliner, Ricard; Gabriel, David; Gamisans Noguera, Javier 2012-10-31T11:49:52Z http://hdl.handle.net/2117/16100 Title: Indices miniers et métallurgie ancienne dans la Catalogne sub-pyrénéenne Authors: Martín Cólliga, Araceli; Mata Perelló, Josep Maria; Gallart Fernández, Josep; Rovira Hortalà, Carme 2012-06-19T10:46:14Z http://hdl.handle.net/2117/15784 Title: Biogenic hydroxypatite (Apatite II TM) dissolution kinetics and metal removal from acid mine drainage Authors: Oliva Moncunill, Josep; Cama, Jordi; Cortina Pallás, José Luís; Ayora Ibáñez, Carlos; Pablo Ribas, Joan de 2012-05-07T10:39:57Z http://hdl.handle.net/2117/15780 Title: Is corporate social responsibility possible in the mining sector? Evidence from catalan companies Authors: Vintró Sánchez, Carla; Fortuny Santos, Jordi; Sanmiquel Pera, Lluís; Freijo Álvarez, Modesto; Edo Tomás, Joaquín Jesús 2012-05-07T08:52:25Z http://hdl.handle.net/2117/15307 Title: Social geology: a new perspective on geology Authors: Mata Perelló, Josep Maria; Mata Lleonart, Roger; Vintró Sánchez, Carla; Restrepo Martínez, Catalina 2012-02-22T12:53:02Z http://hdl.handle.net/2117/15297 Title: Geochemical characterization of a spanish leonardite coal Authors: Olivella Costa, Maria Àngels; Solé Sardans, Maria Montserrat; Gorchs Altarriba, Roser; Lao Luque, Concepción; Heras Cisa, F. Xavier de las 2012-02-22T09:09:36Z http://hdl.handle.net/2117/15165 Title: Análisis de las prácticas de química de futuros ingenieros: propuestas de mejora efectivas en el marco del Espacio Europeo de Educación Superior Authors: Tortosa, Montserrat; Gorchs Altarriba, Roser 2012-02-15T13:05:38Z http://hdl.handle.net/2117/14805 Title: Recorregut de recerca geològica, mineralògica i minera per les comarques del Berguedà i de la Cerdanya: des de Guardiola de Berguedà, a la Bòfia de Bagà, a coll de Pal i a la Tosa (1a part) Authors: Mata Perelló, Josep Maria 2012-01-25T13:04:47Z