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Dimensionamento de wetland de fluxo vertical com nitrificacao (in Portuguese) - Adaptacao de model o euopeu para as condicoes climaticas do Brasil

Platzer, C., Senf, C., Hoffman, H., Cardia, W., Ribeiro da Costa, R. H., (2007)

Published in: 2007

Author:
Platzer, C., Senf, C., Hoffman, H., Cardia, W., Ribeiro da Costa, R. H.,

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O modelo de dimensionamento de wetland de fluxo vertical, desenvolvido por Platzer (1998), para condições de clima europeu, foi usado em uma planta piloto com o objetivo de verificar sua adaptabilidade em condições climáticas do (Sul do) Brasil e adaptar seus coeficientes. Uma vez adaptado, este modelo pode ser usado para o tratamento de qualquer tipo de efluente em wetland de fluxo vertical, pois é baseado no gasto do oxigênio para os processos aeróbios da degradação. Operou-se uma planta piloto, com esse modelo dimensionado no limite de sua oferta de oxigênio necessário, ou seja, um pouco acima de carga máxima possível para completar os processos aeróbios. Na primeira fase foi aplicada uma carga orgânica de 0,28 kg BOD5 / m² * d e em seguida uma carga de 0,35 kg BOD5 / m² * d. Mesmo com as altas cargas aplicadas, durante as 18 semanas da operação não ocorreu nenhum processo de colmatação, fenômeno que representa o maior obstáculo no tratamento de efluentes em wetland, especialmente no caso de carga orgânica elevada e mais rápido ainda em regiões de clima frio. Em clima subtropical o dimensionamento pelo modelo de uso de oxigênio se mostrou adequado para evitar esse problema, e também se mostrou sua perfeitamente aplicabilidade na modelação dos
processos de degradação aeróbia em wetlands. Esta degradação não se completou totalmente devido ao limite de oferta de oxigênio, sendo então removidos 0,23 kg BOD5 / m² * d (85%) na primeira fase e 0,32 kg BOD5 / m² * d (92%) na segunda fase. A eficiência da nitrificação foi 84% na primeira e 89% na segunda fase. Importante é que o balanço entre oxigênio oferecido pelo dimensionamento e oxigênio realmente utilizado pelos processos biológicos em ambas as fases fechou quase em 100%. Com esse resultado o modelo apresentado é aplicável sem limitações para o dimensionamento adaptado nos diferentes efluentes de wetlands de fluxo vertical.

Bibliographic information

Platzer, C., Senf, C., Hoffman, H., Cardia, W., Ribeiro da Costa, R. H., (2007). Dimensionamento de wetland de fluxo vertical com nitrificacao (in Portuguese) - Adaptacao de model o euopeu para as condicoes climaticas do Brasil.

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Constructed wetlands Greywater or wastewater Latin America & Caribbean Portuguese

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