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Tratamento do escoamento agrÃcola com materiais que retêm o fósforo
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ISBN10: 6208371384
ISBN13: 9786208371388
Publisher: Edicoes Nosso Conhecimento
Published: Dec 11 2024
Pages: 60
Weight: 0.22
Height: 0.14 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786208371388
Publisher: Edicoes Nosso Conhecimento
Published: Dec 11 2024
Pages: 60
Weight: 0.22
Height: 0.14 Width: 6.00 Depth: 9.00
Language: Portuguese
Nas últimas décadas, os investigadores estudaram e aplicaram numerosos métodos para reduzir as perdas não pontuais de fósforo (P). Para reduzir ainda mais as perdas de P provenientes da agricultura, os actuais métodos de redução de P devem ser alterados com técnicas adicionais. Uma dessas técnicas envolve a utilização de materiais de retenção de P como filtros colocados em valas dentro de áreas agrÃcolas. Este estudo engloba um conjunto de configurações laboratoriais, meso e em grande escala para identificar potenciais materiais de retenção de P disponÃveis na Finlândia. Os estudos laboratoriais investigaram o potencial de retenção de P de materiais frescos e intemperizados ricos em Ca, bem como de materiais ricos em Fe, em testes de escoamento. O material mais promissor foi posteriormente utilizado em filtros de meso e grande escala. À medida que a aplicação do material foi aumentada e a concentração de P influente diminuiu, a retenção cumulativa de P diminuiu. A experiência em mesoescala indicou que a eficiência da remoção de P diminuiu também devido à presença de carbono orgânico dissolvido nos afluentes. Quanto ao filtro grande, a formação de caminhos preferenciais de água reduziu a sua eficiência. Além disso, em condições de caudal elevado, o filtro grande tratou apenas uma pequena parte do caudal de entrada.
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