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Traitement des eaux de ruissellement agricoles à l'aide de matériaux retenant le phosphore
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ISBN10: 6208371309
ISBN13: 9786208371302
Publisher: Editions Notre Savoir
Published: Dec 11 2024
Pages: 60
Weight: 0.22
Height: 0.14 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786208371302
Publisher: Editions Notre Savoir
Published: Dec 11 2024
Pages: 60
Weight: 0.22
Height: 0.14 Width: 6.00 Depth: 9.00
Language: French
Au cours des dernières décennies, les chercheurs ont étudié et mis en oeuvre de nombreuses méthodes pour réduire les pertes diffuses de phosphore (P). Pour réduire davantage les pertes de P provenant de l'agriculture, les méthodes actuelles de réduction du P doivent être complétées par d'autres techniques. L'une de ces techniques consiste à utiliser des matériaux retenant le P comme filtres placés dans les fossés des zones agricoles. Cette étude comprend un ensemble d'installations en laboratoire, à méso-échelle et à grande échelle afin d'identifier les matériaux retenant le P disponibles en Finlande. Les études de laboratoire ont examiné le potentiel de rétention du P de matériaux riches en Ca et en Fe, frais et altérés, dans des tests d'écoulement. Le matériau le plus prometteur a ensuite été utilisé dans des filtres à méso-échelle et à grande échelle. Au fur et à mesure que l'application du matériau était augmentée et que la concentration de P dans l'effluent diminuait, la rétention cumulative de P diminuait. L'expérience à méso-échelle a indiqué que l'efficacité de l'élimination du P diminuait également en raison de la présence de carbone organique dissous dans les influents. Quant au grand filtre, la formation de voies d'eau préférentielles a réduit son efficacité. En outre, dans des conditions de débit élevé, le grand filtre n'a traité qu'une petite partie du débit entrant.
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