Search results for "Medi ambient Degradació"
showing 10 items of 10 documents
Study of Mass Oxygen Transfer in a Biotrickling Filter for Air Pollution Control
2012
Biotrickling filtration is a potential and cost effective alternative for the treatment of volatile organic compound (VOC) emissions in air, so it is necessary to deepen into the key aspects of design and operation for the optimization of this technology. One of these factors is the oxygen mass transfer of the process. This study would facilitate the selection of the packing material and the mathematical modelling and simulation of bioreactors. Four plastic packing materials with a different specific surface area have been evaluated in terms of oxygen mass transfer. For the tested range of superficial liquid velocities, data show a relationship between the kLa and the superficial liquid vel…
Environmental problems and Geographic education. A case study: Learning about the climate and landscape in Ontinyent (Spain)
2021
AbstractCultural perceptions of the environment bring us back to elements and factors guided by “natural” cause-effect principles. It seems that academic education has had little effect on the manner and results of learning about changes in the local landscape, especially as regards rational explanations. There is considerable difficulty relating academic concepts about the climate to transformations in the environmental landscape. Teaching tasks are mediatized due to the use of rigorous and precise concepts which facilitate functional and satisfactory learning. This is the objective of the research this article aims to undertake, for which we have chosen the case of Ontinyent (Spain). This…
Table olive wastewater as a potential source of biophenols for valorization : a mini review
2022
The table olive industry generates high amounts of wastewater annually during the alkaline treatment, fermentation, and washing steps of olives. High conductivity and salt content, as well as the high organic and biophenol contents of these waters, is a worldwide problem, especially in the Mediterranean region, which is the major table olive producing area. There is a wide variety of bioactives found in wastewater derived from table olive processing. The main compounds of table olive wastewater, such as those derived from phenolic, hydrocarbon, and sugar fractions, can be recovered and reused. In this review, the table olive manufacturing processes and the volumes and composition of wastewa…
Efecto de la contaminación ambiental sobre las superficies foliares de Pinus nigra de Els Ports (Castellón)
1990
Possible alterations caused by air pollution in the wax structures of Pinus nigra needles, growing in 'els Ports' location (Castellón), have been examined by scanning electron microscopy. Our results show that the percentage of structurally functional epistomatic chambers decrease with needle age, being the adaxial surfaces preferently eroded. Structural alterations of epistomatic waxes in needles from trees growing in this area are greatly enhanced in comparison to controls.
The critical environmental situation of the Black Sea region
2002
From time to time, Black Sea States have expressed their concern about the state of the marine environment in the Black Sea region and their political wish to protect and rehabilitate it. But these occasional expressions of good faith on the need to protect the marine and coastal environment of the Black Sea region have scarcely been concretised with the adoption of legal measures at the international, regional and national levels. Therefore, it seems that although Black Sea States acknowledge the need and urgency of protecting the marine environment in this particular region, the environmental concern is not one of its main political objectives. It is true that during the last few years ma…
The Oblivion of Demography in Sustainability’s Studies
2017
[RESUMEN] A lo largo de la historia del Homo sapiens, su número se ha mantenido muy reducido y hubo que esperar a principios del siglo XIX para que alcanzara los mil millones. Se inició entonces un rápido crecimiento y durante el siglo XX la población mundial casi se cuadriplicó, superando los 6000 millones, lo que llevó a estudiar, con lógica preocupación, los posibles efectos de esta explosión demográfica sobre el conjunto de la biosfera y sobre la propia especie humana. Hoy, sin embargo, cuando se han sobrepasado los 7500 millones y la población mundial sigue aumentando en unos 80 millones cada año, la problemática demográfica ha dejado de tener una presencia relevante en los estudios y …
Durabilidad y degradación de plásticos: la falsa dicotomía del diseño para la sostenibilidad
2017
El diseño de nuevos productos plásticos, desde el punto de vista clásico de la sostenibilidad, debe atender a los requerimientos de tres ejes: (i) el económico, ya que aporta aportar valor en términos de crecimiento empresarial, posicionamiento y competitividad; (ii) el social, al responder a una necesidad de la sociedad; (iii) y el medioambiental, dado que se exige que contribuya a cuidar el entorno donde se desarrollan las actividades sociales y económicas. En la concepción de un plástico, el diseño se sustenta en la interrelación entre (i) el material elegido, y sus propiedades intrínsecas; (ii) el proceso de transformación, con sus ventanas de procesado; y (iii) la aplicación de destino…
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.
Preliminary assessment of terrestrial microalgae isolated from lichens as testing species for environmental monitoring: Lichen phycobionts present hi…
2013
Bioassays constitute a tool for pollution analysis providing a holistic approach and high-quality indication of the toxicity. Microbioassays allow evaluating the toxicity of many samples, implying lower costs and enabling routine monitoring and pollution control. But tests conducted so far are limited to the use of a small number of taxa. Lichens are excellent bioindicators of pollution with great ecological significance. Studies show that the phycobiont is more sensitive to pollutants than the mycobiont. Phycobiont have features such as adaptation to anhydrobiosis and relatively rapid growth in vitro, making them suitable for microbioassays. Our aim is to determine the sensitivity of phyco…
Algunos obstáculos e incomprensiones en torno a la sostenibilidad
2006
Nos enfrentamos, literalmente y sin exageración alguna, a una guerra. La guerra sin cuartel que nos inflinge una degradación ambiental y social, fruto de intereses a muy corto plazo y de una ignorancia suicida. Una guerra que todavía podemos ganar, si reaccionamos ya y colocamos el objetivo de un futuro sostenible en primer plano, mediante la necesaria conjunción de medidas tecnológicas, educativas y políticas. Y el primer paso es despertar a la población que ignora los peligros y las soluciones. Algo de lo que estamos todavía muy lejos y a lo que parece no estamos contribuyendo suficientemente.