Posts tagged ‘Depuracion ecológica’

Madrid invertirá un millón de euros en la red de agua reciclada que regará 22 parques

La Junta de Gobierno del Ayuntamiento de Madrid aprobó ayer un gasto plurianual de 1.008.204,91 euros para prorrogar el contrato de conservación de las redes de riego con agua regenerada de 22 parques y jardines de la ciudad, incluidos la Casa de Campo y el Retiro.

La red está formada por más de 365 kilómetros de tuberías de goteo, 33.731 aspersores, 15.477 difusores y 1.805 bocas de riego, según la alcaldesa, Ana Botella.

Los parques incluidos en este contrato son los del Retiro, del Oeste, Fuente del Berro, Pradolongo, Emperatriz María de Austria, Las Cruces, Eugenia de Montijo, Entrevías, Enrique Tierno Galván, Roma, Atenas, San Isidro, Cuña Verde de Latina, Carlos Arias Navarro, Cerro Almodóvar, paseo fluvial del tramo inferior del río Manzanares, Casa de Campo, Vivero de Casa de Campo, Bombilla, Vivero de Migas Calientes, La Gavia y Garrigues Walker.

La gestión de los sistemas y redes de riego abastecidos con agua regenerada supone una coordinación entre los diferentes parques y jardines, pues se trata de un sistema interrelacionado que requiere una gestión integral.

Además, estas instalaciones utilizan materiales visualmente diferentes a los de las redes de agua potable. Por ello se necesita que el mantenimiento, conservación, reparación de las redes y el control del uso del agua sean independientes de los correspondientes al agua potable.

Los técnicos, encargados y personal de oficio deben especializarse en el uso del agua regenerada y emplear los materiales de reposición específicos manteniendo todos los sistemas en perfecto estado.

Así, es necesario contar con un contrato específico para la conservación de los sistemas y redes de riego de agua regenerada en los parques y jardines de Madrid.

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24 de septiembre de 2012 at 18:07 Deja un comentario

Las Lombrices eliminan metales pesados de residuos biológicos

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Earthworms Extract Heavy Metals from Biowastes

Earthworms Extract Heavy Metals from BiowastesEarthworms could be used to extract toxic heavy metals, including cadmium and lead, from solid waste from domestic refuse collection and waste from vegetable and flower markets, according to researchers at Pondicherry University, in Puducherry, India.

Writing in scientific journal, the International Journal of Environment and Waste Management, the researchers explained how three species of earthworm, Eudrilus eugeniae, Eisenia fetida and Perionyx excavates can be used to assist in the composting of urban waste and to extract heavy metals, cadmium, copper, lead, manganese, zinc, during subsequent processing.

The researchers – Swati Pattnaik and M. Vikram Reddy of the Department of Ecology and Environmental Sciences, at Pondicherry University – explained that with rapid increases in urban populations particularly in the developing world, there is a growing problem of how to manage organic waste and to find alternatives to landfill disposal particularly for domestic food waste and that from vegetable markets.

According to the research team, in India much of this waste is currently dumped on the outskirts of towns and cities and is causing serious pollution. It also represents a considerable wasted resource.

The process of vermicomposting using these species of worms allows such waste materials to be remediated and the compost used subsequently for use in growing human food without the risk of accumulating heavy metals in crops.

The team claimed that up to 75% of the various heavy metals can be removed by the worms from solid waste.

The researchers found that the Eudrilus eugeniae species was the most effective worm for remediating solid waste and producing rich compost, with tests demonstrating that the heavy metal content of such waste can be reduced to levels significantly below the permissible safe limits.

The worms’ digestive system is said to be capable of detaching heavy metal ions from the complex aggregates between these ions and humic substances in the waste as it rots.

According to the researchers various enzyme-driven processes then seem to lead to assimilation of the metal ions by the worms so that they are locked up in the organism’s tissues rather than being released back into the compost as worm casts or vermicompost.

The separation of dead worms from compost is a relatively straightforward process allowing the heavy metal to be removed from the organic waste.

17 de septiembre de 2012 at 23:39 Deja un comentario


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