5 research outputs found

    Estudio aerobiol贸gico del municipio de Ronda y Sierra de las Nieves (sur de Espa帽a). An谩lisis comparativo y elaboraci贸n de modelos

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    Con los datos obtenidos, se ha observado que la temperatura media y precipitaci贸n total anual del 谩rea de estudio se han visto alteradas en los 煤ltimos treinta a帽os como consecuencia del cambio clim谩tico. Dado que las condiciones clim谩ticas y meteorol贸gicas influencian la cantidad y temporalidad del polen y esporas detectadas, es esperable que se vean afectadas por el cambio clim谩tico. Las diferencias observadas entre los puntos de muestreo a escalas estacional, diaria e intradiaria se deben principalmente a la vegetaci贸n, el uso del suelo y la din谩mica de vientos de la zona. Los modelos predictivos y de interpolaci贸n espacial elaborados permiten maximizar los beneficios del muestreo aerobiol贸gico y elaborar informes del contenido pol铆nico de la atm贸sfera para alertar a la poblaci贸n al茅rgica de toda la provincia de M谩laga. Las herramientas computacionales elaboradas permiten reducir el tiempo requerido para la gesti贸n y visualizaci贸n de datos aerobiol贸gicos.Ronda es una de las principales ciudades del interior de la provincia de M谩laga (sur de Espa帽a) y se encuentra sobre una meseta rodeada por cordilleras. Entre las m谩s cercanas se encuentra el Parque Natural Sierra de las Nieves, actualmente en v铆a de ser declarado Parque Nacional. A trav茅s del estudio del contenido pol铆nico y de esporas de la atm贸sfera, se puede obtener informaci贸n sobre el comportamiento reproductivo de las poblaciones vegetales y de hongos de la zona, lo que resulta indispensable para su gesti贸n y conservaci贸n, y para la prevenci贸n de alergias respiratorias en las poblaciones cercanas. Se muestre贸 la atm贸sfera de la ciudad de Ronda y del Parque Natural Sierra de las Nieves ininterrumpidamente durante 3 y 2 a帽os respectivamente. Tambi茅n se realiz贸 un seguimiento in situ de la fenofase de floraci贸n de las principales especies anem贸filas de la zona. Con los resultados obtenidos se estudi贸 el comportamiento aerobiol贸gico de ambas localidades, se determinaron los taxones de mayor incidencia en la atm贸sfera, su variaci贸n temporal (estacional, intradiaria e interanual) y se compararon los comportamientos de ambas zonas estudiadas. Se elaboraron calendarios pol铆nicos, se estudi贸 la relaci贸n existente entre el polen atmosf茅rico y variables meteorol贸gicas, clim谩ticas, datos de fenolog铆a in situ, de vegetaci贸n real y uso del suelo. Tambi茅n se elaboraron modelos de pron贸stico y de interpolaci贸n espacial de datos aerobiol贸gicos, y se desarroll贸 un paquete de herramientas computacionales para automatizar las principales funciones que se realizan en la investigaci贸n aerobiol贸gica y para interpolar datos ausentes. De forma complementaria se estudi贸 la tendencia de las principales variables clim谩ticas para determinar el efecto del cambio clim谩tico en la zona de estudio

    Biotrickling filters for biogas sweetening: oxygen transfer improvement for a reliable operation

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    An industrial-scale biotrickling filter for the removal of high concentrations of H2S is described in this work. The system has been operating at H2S inlet concentrations between 1000 and 3000 ppmv at acidic conditions. A decrease of pH from 2.6 to 1.8 did not affect the biological activity inside the biofilter while reducing the water make-up consumption up to 75%. The current oxygen supply system, based on direct injection of air to the liquid phase, has demonstrated to be inefficient for a long-term operation leading to elemental sulfur accumulation in the packing material (i.e. promoting clogging episodes). The present study demonstrates it is possible to partially remove (40.3%) the deposited elemental sulfur by bio-oxidation when biogas is not fed. In normal operation conditions, the implementation of an aeration system based on jet-venturi devices has shown quite promising results in terms of oxygen transfer efficiency and robustness. Such improvement of oxygen transfer was translated in a better conversion of H2S to sulfate, which increased around 17%, prolonging the lifespan operation at low-pressure drop.Peer ReviewedPreprin

    Assessment Protocol to Evaluate the Degree of Conservation of Habitats of Community Interest: A Case Study for the 5220* HCI in the Westernmost Localities of Europe

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    The westernmost European nucleus of the 5220* Habitat of Community Interest (HCI) is located in the province of M谩laga (Andalusia). In this area, the 5220* HCI is characterized by the presence of scrublands of Gymnosporia senegalensis subsp. europaea. This is a relict species in Europe, with inhabits only in the southeast of the Iberian Peninsula. The westernmost Iberian nuclei of the 5220* HCI are constituted by three isolated nuclei (M谩laga鈥揜inc贸n de la Victoria; Torremolinos; and Pizarra). These nuclei have been only partially mapped. The objectives were: to map the 5220* HCI characterized by G. senegalensis subsp. europaea in detail; to evaluate its degree of conservation (DC); and to identify the chronosequences of the evolution of this habitat from 1957 to 2021, and its fragmentation. Our results have contributed to generating a 1:10,000 scale cartography of the habitat. In general, the DC obtained was from good to excellent. With an excellent DC value, one inland locality (Pizarra) was highlighted. However, the highest reduction in the value of DC was observed in the localities of Torremolinos and M谩laga鈥揜inc贸n de la Victoria which, in addition, have reduced the area of occupancy (AOO) and are fragmented. It is important to note that some areas of M谩laga鈥揜inc贸n de la Victoria reached excellent values of DC, indicating the need to carry out protection.This paper was supported by the project CEIJ-006- 鈥淓valuaci贸n del estado de conservaci贸n del litoral mediterr谩neo terrestre en el sureste ib茅rico (M谩laga-Granada, Espa帽a) mediante el uso de flora relevante, al贸ctonas invasoras y h谩bitats 92/43UE. Propuesta de gesti贸n鈥 of the Campus of International Global Excellence of the Sea. A. Picornell was supported by a postdoctoral grant financed by the Consejer铆a de Transformaci贸n Econ贸mica, Industria, Conocimiento y Universidades (Junta de Andaluc铆a, POSTDOC_21_00056). This publication has been also funded by the University of Malaga (鈥淚 Plan Propio de Investigaci贸n, Transferencia y Divulgaci贸n Cient铆fica de la Universidad de M谩laga鈥). Partial funding for open access charge: Universidad de M谩lag

    Biotrickling filters for biogas sweetening: oxygen transfer improvement for a reliable operation

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    An industrial-scale biotrickling filter for the removal of high concentrations of H2S is described in this work. The system has been operating at H2S inlet concentrations between 1000 and 3000 ppmv at acidic conditions. A decrease of pH from 2.6 to 1.8 did not affect the biological activity inside the biofilter while reducing the water make-up consumption up to 75%. The current oxygen supply system, based on direct injection of air to the liquid phase, has demonstrated to be inefficient for a long-term operation leading to elemental sulfur accumulation in the packing material (i.e. promoting clogging episodes). The present study demonstrates it is possible to partially remove (40.3%) the deposited elemental sulfur by bio-oxidation when biogas is not fed. In normal operation conditions, the implementation of an aeration system based on jet-venturi devices has shown quite promising results in terms of oxygen transfer efficiency and robustness. Such improvement of oxygen transfer was translated in a better conversion of H2S to sulfate, which increased around 17%, prolonging the lifespan operation at low-pressure drop.Peer Reviewe

    Higher airborne pollen concentrations correlated with increased SARS-CoV-2 infection rates, as evidenced from 31 countries across the globe

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    Pollen exposure weakens the immunity against certain seasonal respiratory viruses by diminishing the antiviral interferon response. Here we investigate whether the same applies to the pandemic severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which is sensitive to antiviral interferons, if infection waves coincide with high airborne pollen concentrations. Our original hypothesis was that more airborne pollen would lead to increases in infection rates. To examine this, we performed a cross-sectional and longitudinal data analysis on SARS-CoV-2 infection, airborne pollen, and meteorological factors. Our dataset is the most comprehensive, largest possible worldwide from 130 stations, across 31 countries and five continents. To explicitly investigate the effects of social contact, we additionally considered population density of each study area, as well as lockdown effects, in all possible combinations: without any lockdown, with mixed lockdown鈭抧o lockdown regime, and under complete lockdown. We found that airborne pollen, sometimes in synergy with humidity and temperature, explained, on average, 44% of the infection rate variability. Infection rates increased after higher pollen concentrations most frequently during the four previous days. Without lockdown, an increase of pollen abundance by 100 pollen/m3 resulted in a 4% average increase of infection rates. Lockdown halved infection rates under similar pollen concentrations. As there can be no preventive measures against airborne pollen exposure, we suggest wide dissemination of pollen鈭抳irus coexposure dire effect information to encourage high-risk individuals to wear particle filter masks during high springtime pollen concentrations.</p
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