Search results for "Aire Contaminació"
showing 8 items of 8 documents
Removal of 2-butoxyethanol gaseous emissions by biotrickling filtration packed with polyurethane foam
2016
The removal of 2-butoxyethanol from gaseous emissions was studied using two biotrickling filters (BTF1 and BTF2) packed with polyurethane foam. Two different inoculum sources were used: a pure culture of Pseudomonas sp. BOE200 (BTF1) and activated sludge from a municipal wastewater treatment plant (BTF2). The bioreactors were operated at inlet loads (ILs) of 130 and 195 g m(-3) hour(-1) and at an empty bed residence time (EBRT) of 12.5s. Under an IL of ∼130 g m(-3) hour(-1), BTF1 presented higher elimination capacities (ECs) than BTF2, with average values of 106±7 and 68±8 g m(-3) hour(-1), respectively. However, differences in ECs between BTFs were decreased by reducing the irrigation inte…
Control of VOCs from printing press air emissions by anaerobic bioscrubber: Performance and microbial community of an on-site pilot unit
2017
Abstract A novel process consisted of an anaerobic bioscrubber was studied at the field scale for the removal of volatile organic compounds (VOCs) emitted from a printing press facility. The pilot unit worked under high fluctuating waste gas emissions containing ethanol, ethyl acetate, and 1-ethoxy-2-propanol as main pollutants, with airflows ranging between 184 and 1253 m 3 h −1 and an average concentration of 1126 ± 470 mg-C Nm −3 . Three scrubber configurations (cross-flow and vertical-flow packings and spray tower) were tested, and cross-flow packing was found to be the best one. For this packing, daily average values of VOC removal efficiency ranged between 83% and 93% for liquid to a…
A Comparative Analysis of Aerosol Microphysical, Optical and Radiative Properties during the Spring Festival Holiday over Beijing and Surrounding Reg…
2018
ABSTRACT Using ground-based data, meteorological observations, and atmospheric environmental monitoring data, a comparative analysis of the microphysical and optical properties, and radiative forcing of aerosols was conducted between three stations in different developed environments during a severe air pollution episode during the Spring Festival over Beijing. During the most polluted period, the daily peak values of the aerosol optical depth were ~1.62, ~1.73, and ~0.74, which were about 2.6, 2.9, and 2.1 times higher than the background levels at the CAMS, Xianghe, and Shangdianzi sites, respectively. The daily peak values of the single scattering albedo were ~0.95, ~0.96, and ~0.87. The…
Fuzzy set qualitative comparative analysis (fsQCA) applied to the adaptation of the automobile industry to meet the emission standards of climate cha…
2021
Abstract Facing global climate change challenges entails a sustainable development of transportation. Governments and automobile manufacturers are highly aware of how a large-scale deployment of Electric Vehicles (EVs) can reduce greenhouse gas (GHG) emissions and mitigate global warming. This study aids the design of the adaptation strategies of the automotive industry to meet global goals on climate change by means of a fuzzy-set qualitative comparative analysis (fsQCA), which makes it possible to measure the level of actors’ satisfaction. This allows identification of a combination of factors leading to the outcome while dealing with uncertain environments due to the heterogeneous nature…
Enhanced styrene removal in a two-phase partitioning bioreactor operated as a biotrickling filter: Towards full-scale applications
2017
Abstract Styrene vapor abatement was investigated in a two-phase partitioning bioreactor operated as a biotrickling filter (TPPB-BTF). The removal performance of the TPPB-BTF was simultaneously compared with a conventional BTF, which served as a control. Industrial-grade silicone oil was used as the non-aqueous phase in the TPPB-BTF due to its high affinity for styrene. Both bioreactors were operated at styrene inlet concentrations ranging from 55 to 323 mg C m −3 and empty bed residence times (EBRT) of 15–30 s, corresponding to pollutant loading rates of 13–77 g C m −3 h −1 . Both bioreactors exhibited styrene removal efficiencies (REs) higher than 90% at an EBRT of 30 s. Nevertheless, th…
La contribución a la Década de la Educación por un Futuro Sostenible. Un compromiso ineludible para educadores e investigadores (Editorial)
2007
Vivimos una situación de auténtica emergencia planetaria , expresión acuñada por el biólogo Richard Bybee (1991) para llamar la atención sobre el conjunto de problemas de alcance global y estrechamente relacionados a los que la humanidad ha de hacer hoy frente. Una contaminación pluriforme y sin fronteras que envenena suelos, ríos y mares, hace irrespirable el aire y está provocando un acelerado cambio climático qué amenaza con hacer inhabitable nuestro planeta.
Exposición a factores ambientales y riesgo de tumores en el sistema nervioso central en niños: revisión sistemática y metaanálisis
2014
Se analiza el riesgo de tumores en el sistema nervioso central en niños en relación con la exposición a factores ambientales como radiaciones (ionizantes, no ionizantes), sustancias químicas (pesticidas, productos de belleza, contaminantes atmosféricos) y alimentos. Se realizó una revisión sistemática y un metaanálisis con estudios identificados en la búsqueda de PubMed (1987-2013). Los resultados obtenidos a partir de los valores de OR muestran que el riesgo de tumores en el sistema nervioso central en niños se asocia significativamente con la exposición de los padres y que el periodo prenatal es una ventana crítica para varios de los factores ambientales considerados. Aunque la fracción d…
El Ozono atmosférico, ¿benefactor o malhechor?
2001
En este trabajo se analiza la presencia del gas ozono en la estratosfera y en la troposfera, la acción de determinados agentes contaminantes que alteran su equilibrio natural y las consecuencias que esto último comporta. Finalmente, se apuntan posibles acciones individuales que pueden ayudar a restablecer las proporciones adecuadas de ozono en las distintas capas atmosféricas.