Search results for "Ambiente"

La celebración del protocolo al tratado Antártico sobre protección del medio ambiente: Orígenes y negociaciones

1993

En el presente trabajo se analiza la historia de la celebración del Protocolo de Madrid al Tratado Antártico sobre protección del medio ambiente. Tras exponer los diversos intereses en presencia que llevaron a la decisión de negociar este Protocolo al Tratado Antártico, el examen se centra en cómo se consiguieron alcanzar acuerdos tan intensos en materias tan esquivas, como las que afectan a la protección del medio ambiente antártico.

Medio ambiente y conflicto social: el caso de la Albufera de Valencia

1996

Ernest.Garcia@uv.es; Mara.Cabrejas@uv.es

Effect of temperature on ammonium removal in Scenedesmus sp

2015

The effect of temperature on microalgal ammonium uptake was investigated by carrying out four batch experiments in which a mixed culture of microalgae, composed mainly of Scenedesmus sp., was cultivated under different temperatures within the usual temperature working range in Mediterranean climate (15-34 ºC). Ammonium removal rates increased with temperature up to 26 ºC and stabilized thereafter. Ratkowsky and Cardinal Temperatures models successfully reproduced the experimental data. Optimum (31.3 ºC), minimum (8.8 ºC) and maximum (46.1 ºC) temperatures for ammonium removal by Scenedesmus sp. under the studied conditions were obtained as model parameters. These temperature-related paramet…

The role of charophytes in a Mediterranean pond created forrestoration purposes

2015

A small, shallow basin was created and flooded with groundwater in a Reserve Area in Albufera de València Natural Park (AVNP) under the scope of a restoration program intended to mimic typical environments such as freshwater springs, abundant in the past but currently suffering from deterioration (desiccation, pollution, etc.), with the ultimate goal of increasing local biodiversity of submerged macrophytes, particularly charophytes. In this study we have monitored, from April 2009 (a few months after its first flooding) to September 2012, the dynamics of charophyte growth and related physical, chemical and biotic variables to highlight the factors determining charophyte success. Just after…

Environmental Metal Pollution Considered as Noise: Effects on the Spatial Distribution of Benthic Foraminifera in two Coastal Marine Areas of Sicily …

2008

We analyze the spatial distributions of two groups of benthic foraminifera (Adelosina spp. + Quinqueloculina spp. and Elphidium spp.), along Sicilian coast, and their correlation with six different heavy metals, responsible for the pollution. Samples were collected inside the Gulf of Palermo, which has a high level of pollution due to heavy metals, and along the coast of Lampedusa island (Sicily Channel, Southern Mediterranean), which is characterized by unpolluted sea waters. Because of the environmental pollution we find: (i) an anticorrelated spatial behaviour between the two groups of benthic foraminifera analyzed; (ii) an anticorrelated (correlated) spatial behaviour between the first …

Nitrogen recovery using a membrane contactor: Modelling nitrogen and pH evolution

2020

[EN] A hollow fibre membrane contactor has been applied for nitrogen recovery from anaerobic digestion supernatant at different operating conditions obtaining nitrogen recovery efficiencies over 99 %. A mathematical model able to represent the time evolution of pH and nitrogen concentration during the recovery process is presented in this paper. The developed model accurately reproduced the results obtained in 26 experiments carried out at different pH values (from 9 to 11), temperatures (from 25 to 35 degrees C), membrane surfaces (from 1.2 to 2.4 m(2)) and feed flow rates (from 0.33 x 10(-5) to 5.83 x 10(-5) m(3)/s) predicting the variations in nitrogen recovery rates measured at the diff…

El nuevo paradigma

1998

Performance of industrial scale hollow-fibre membranes in a submerged anaerobic MBR (HF-SAnMBR) system at mesophilic and psychrophilic conditions

2013

The aim of this work was to evaluate the effect of temperature on the performance of industrial hollow-fibre (HF) membranes treating urban wastewater in a submerged anaerobic MBR system (SAnMBR). To this end, a demonstration plant with two commercial HF ultrafiltration membrane modules (PURON®, Koch Membrane Systems, PUR-PSH31) was operated at 20, 25 and 33 °C. The mixed liquor total solid (MLTS) level was a key factor affecting membrane permeability (K). K was higher under psychrophilic than mesophilic conditions when operating at similar transmembrane fluxes and MLTS, because the biomass activity of the psychrophilic mixed liquor was lower than the mesophilic mixed liquor. Thus, lower ext…

Model performance of partial least squares in utilizing the visible spectroscopy data for estimation of algal biomass in a photobioreactor

2018

[EN] Spectroscopy technology and statistical methods (Partial Least Squares) have been integrated to develop a model that allows estimating the microalgal biomass in a photobioreactor. The model employing PLS combines the absorption spectrum measurements in the visible range (400-750 nm) with a microalgae cell density in a water sample. First, a calibration model was constructed using a calibration data set, and then, the predictive capacity of the model was determined by cross validation. Finally, an external validation of the predictive performance of the model was carried out with an independent data set. To test the accuracy of the model it was applied to different culture conditions yi…

Hacia la integración del medio ambiente y el desarrollo sostenible en la región mediterránea

2018

I. INTRODUCCIÓN.- II. EL SISTEMA ORIGINARIO PARA LA PROTECCIÓN DEL MAR MEDITERRÁNEO CONTRA LA CONTAMINACIÓN: 1. Las Conferencias de Barcelona de 1975 y 1976. 2. Su desarrollo posterior.- III. EL PROCESO DE REVISIÓN: 1. La Conferencia Ministerial sobre Desarrollo Sostenible en el Mediterráneo. 2. Hacia la IX Reunión Ordinaria de las Partes Contratantes en el Convenio de Barcelona.- IV. EL NUEVO MARCO POLÍTICO: 1. La Resolución de Barcelona sobre el medio ambiente y el desarrollo sostenible en la cuenca mediterránea. 2. El Plan de acción para la protección del medio marino y el desarrollo sostenible de las zonas costeras del Mediterráneo (Fase II del PAM). 3. Los Sectores de actividades prior…