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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Desempenho de um sistema de alagado construído, plantado com capim vetiver (chrysopogon zizanioides (l.) roberty), na remoção de metais e de p, s e se de resíduos de fossa / Performance of a constructed wetland system planted with Vetiver grass (Chrysopogon zizanioides (L.) Roberty) in removing metals and P, S and Se from cesspools residues

Cardoso Filho, Delcir Magalhães 17 June 2015 (has links)
Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2015-10-27T14:26:57Z No. of bitstreams: 2 Dissertação - Delcir Magalhães Cardoso Filho - 2015.pdf: 1361711 bytes, checksum: efc64fdbb620dc4c287b17ce56d2aaed (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-10-27T14:28:50Z (GMT) No. of bitstreams: 2 Dissertação - Delcir Magalhães Cardoso Filho - 2015.pdf: 1361711 bytes, checksum: efc64fdbb620dc4c287b17ce56d2aaed (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-10-27T14:28:50Z (GMT). No. of bitstreams: 2 Dissertação - Delcir Magalhães Cardoso Filho - 2015.pdf: 1361711 bytes, checksum: efc64fdbb620dc4c287b17ce56d2aaed (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2015-06-17 / The pits and septic tanks wastes have high organic load, pathogens, metals and other elements, requiring appropriate treatment for not pollute the environment. Among the alternatives for their treatment, it has recently been proposed to use constructed wetlands. However, information on such use is scarce. Therefore, this study aimed to evaluate the performance of a constructed wetlands system using the Vetiver grass plant species (Chrysopogon zizanioides), on removing metals, P, S and Se from cesspools residues. Two tanks were constructed, dug into the ground (planted tank and control) and filled with a substrate consisting of gravel # 0, gravel # 1 and medium sand. The system built has operated under batch, with Hydraulic Retention Time of six days and subsurface vertical downward flow. Through obtained concentrations of different inorganic elements on: the applied cesspools residues; the treated effluent; the sludge accumulated at tanks surface and; the vegetal tissues, they were calculated: the total loads influent to the system; the output loads; the efficiency in removing attributes; the load accumulated at tanks surface; the load absorbed by macrophytes and; the loads retained in the roots and by the substrate. The attributes removal efficiency was calculated considering the evapotranspiration that showed an average rate of 40.27% in the Vetiver tank. The applied cesspools residues showed considerable variability in their concentrations. The concentrations of the treated effluent were subjected to Tukey test (α = 0.05). The effluents concentrations from Vetiver and control tanks statistically differed only for antimony, sulfur and iron, but the Vetiver grass showed removal efficiency greater than 20% to 30 of the 33 analyzed parameters. / Os resíduos de fossas e tanques sépticos possuem elevada carga orgânica, microrganismos patogênicos, metais e outros elementos, necessitando de tratamento adequado para não poluir o ambiente. Dentre as alternativas para seu tratamento, recentemente tem sido proposta a utilização de alagados construídos. Todavia, as informações sobre tal uso são ainda escassas. Assim, este trabalho teve como objetivo avaliar o desempenho de um sistema de alagado construído, utilizando a espécie vegetal capim Vetiver (Chrysopogon zizanioides), na remoção de metais, P, S e Se do resíduo de fossa. Foram escavados dois tanques idênticos (tanque plantado e controle) sendo preenchidos com meio suporte formado por brita # 0, brita # 1 e areia média. O sistema construído operou em regime de batelada, com Tempo de Detenção Hidráulica de seis dias e fluxo subsuperficial vertical descendente. Por meio das concentrações obtidas para diferentes elementos inorgânicos: no resíduo de fossa aplicado; no efluente tratado; no lodo superficial acumulado e; nos tecidos das macrófitas, foram calculadas: as cargas totais afluentes do sistema; as cargas de saída; a eficiência na remoção inorgânica; as cargas acumuladas no lodo superficial; as cargas absorvidas pelas macrófitas e; as cargas retidas nas raízes e no meio suporte. A eficiência na remoção inorgânica foi calculada considerando a evapotranspiração, que apresentou taxa média de 40,27% no tanque Vetiver. Os resíduos de fossa aplicados apresentaram grande variabilidade em suas concentrações. As concentrações do efluente tratado foram submetidas ao teste de Tukey (α = 0,05). As concentrações de saída dos tanques Vetiver e Controle diferiram estatisticamente apenas para Antimônio, Enxofre e Ferro, contudo o capim Vetiver apresentou eficiência de remoção superior a 20% para 30 dos 33 atributos analisados. Palavras-chave: capim Vetiver, remoção de metais, zona de raízes.

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