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SCHEER (Scientific Committee on Health, Environmental and Emerging Risks), Final Opinion on “Draft Environmental Quality Standards for Priority Substances under the Water Framework Directive", silver and its compounds, 7-8 October 2021.
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Economía circular y agua: retos y nuevas estrategias
No full textEn los últimos años el término economía circular ha entrado con fuerza en distinto ámbitos, haciéndonos reflexionar sobre la importancia de una mejor gestión de materias primas y la valorización de residuos en todos los niveles de la cadena de producción y consumo. Si bien la economía circular parece estar más enfocada a la gestión de materiales, el mundo del agua no podía quedar al margen de esta estrategia
Ecological risk assessment of pesticides in the Mijares River (eastern Spain) impacted by citrus production using wide-scope screening and target quantitative analysis
No full textImpacto del uso de astillas de madera como enmienda al suelo en un filtro verde piloto: atenuación de nutrientes
No full textVegetation Filters (VFs) are forestry plantations that take advantage of the soil-plant microorganism system mutual action to treat wastewater. The objective of this study is to avoid nutrient leaching by maximizing the treatment efficiency in a pilot VF through: i) the incorporation of soil amendments and ii) the irrigation management. Nitrogen removal by denitrification is greater with woodchip amendment (it boosts microbial activity by increasing the C/N ratio) and with lower loads and more frequent irrigations (it favors anaerobic conditions by maintaining soil moisture). Woodchips and irrigation management do not improve phosphorus removal. Groundwater is not affected by nutrient leaching from the V
Desalación sin energía, desde el concepto a la realidad
No full textEste artículo ilustra el proceso de escalado de la tecnología MDC (microbial desalination cell o celda de desalación microbiana) para el tratamiento de aguas, desde su concepción hace escasamente 10 años, capaz de tratar escasos mililitros, hasta la reciente construcción de la primera unidad piloto capaz de desalar hasta 3,6 m3/día
Influence of acid/base activation treatment in the performance of recycled electromembrane for fresh water production by electrodialysis
No full textIn this study, an activation treatment for recycled anion exchange membranes is proposed. Following the circular economy approach, these membranes were prepared by using end-of-life reverse osmosis membranes as mechanical support. The end-of-life membrane was previously used and discarded by desalination plants after overcoming its lifespan. The activation treatment was based on the subsequent immersion of the membranes in diluted acid and alkali solutions. This treatment promoted the complete dissociation of the functional groups in the membrane, making them more reactive to the counter ions. The effects of acid and alkali concentrations and exposition times on the electrochemical properties were studied and the best combination was selected. In such a way, a decrease of 37 % in membrane electrical resistance was achieved. The performance of activated and non-activated membranes in brackish water desalination by electrodialysis was compared. The results showed that the proposed activation treatment increased the flux of fresh water more than four-fold (from 1.2 to 4.9 L•h-1•m-2), with a considerable reduction of energy consumption (from 5.2 to 3.0 kWh•m-3) and a great improvement in current efficiency (from 38 % to 71 %). In conclusion, this work shows a simple and low cost methodology for the improvement of the electrochemical properties of recycled electromembranes and thus, their performance in electrodialysis
Challenges and Opportunities of the Internet of Things for Global Development to Achieve the United Nations Sustainable Development Goals
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