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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

Some physical and chemical parameters of north San Diego County lagoons

Ross, John William. January 1976 (has links)
Thesis (M.A.)--San Diego State University, 1976. / Includes bibliographical references (leaves [97]-100).
2

ANÃLISE MULTIVARIADA APLICADA NA AVALIAÃÃO DOS PRINCIPAIS SISTEMAS LACUSTRES DA BACIA HIDROGRÃFICA DO RIO COCÃ, FORTALEZA-CE

Josà Wilker de Freitas Sales 12 July 2010 (has links)
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / Com a finalidade de avaliar a qualidade das Ãguas das principais lagoas pertencentes à bacia hidrogrÃfica do rio Cocà (Porangabussu, Opaia, Itaperaoba, Maria Vieira, Messejana, Sapiranga, Maraponga e o Lago JacareÃ). Realizaram-se coletas de Ãgua em trÃs seÃÃes, no perÃodo de agosto/2006 e julho/2007, mensalmente. As variÃveis temperatura, turbidez, pH, CE, DBO5, DQO, OD, SST, SDT, nitrogÃnio amoniacal total, nitrito, nitrato, fÃsforo, alcalinidade, dureza e CTT foram analisadas. Os dados obtidos foram validados, padronizados (Escores Z) e submetidos, ao Programa The Unscrambler versÃo 7.5, para PCA visando reduzir os dados, facilitando na determinaÃÃo da homogeneidade: entre as lagoas e entre os pontos de amostragem de cada lagoa e tambÃm avaliar a interferÃncia da sazonalidade na qualidade da Ãgua dos ecossistemas, facilitando a compreensÃo. Para a homogeneidade entre os ecossistemas apenas a Lagoa de Sapiranga e o Lago Jacareà apresentaram-se heterogÃneos Ãs demais. Provavelmente devido à influÃncia da marà imposta a Lagoa de Sapiranga e ao pequeno aporte hÃdrico do Lago JacareÃ. A homogeneidade das outras lagoas ocorreu em funÃÃo do aporte de matÃria orgÃnica (MO), usos e ocupaÃÃo de suas Ãreas de influÃncias e o efeito de sazonalidade ser comum a todas. A respeito dos fatores que determinam a qualidade da Ãgua dos ecossistemas, existe um padrÃo de poluiÃÃo por parte dos ecossistemas, sempre determinados pelo aporte de (MO), representados pelos esgotos domÃsticos e poluiÃÃo difusa. Essa degradaÃÃo à acentuada em dois perÃodos distintos: nas primeiras chuvas e no perÃodo de estiagem, confirmando a sazonalidade caracterÃstica da regiÃo Nordeste. Assim, à interessante propor que as coletas poderiam ser realizadas semestralmente, ao invÃs de mensal. TambÃm sÃo necessÃrias medidas que controle o aporte de (MO), principalmente, esgotos domÃsticos, jà que a DBO5, DQO, nitrito, nitrogÃnio amoniacal total e fÃsforo total comprometeram significativamente nos resultados propostos pelas componentes principais. Com relaÃÃo ao IET calculado, observa-se que 100% dos pontos de amostragem das lagoas foram classificados como hipereutrÃficos. Analisando o comportamento das variÃveis: DBO5, pH, OD e fÃsforo total com a Res. CONAMA n 357/05 observa-se que quase na totalidade dos casos os parÃmetros estiveram fora dos padrÃes legais. Sendo assim, estes ecossistemas precisam està numa perspectiva de melhoria da qualidade, com uma eficiente intervenÃÃo do poder pÃblico para que a comunidade possa usufrui destes ambientes / This study was to evaluate the quality water of the main lake ecosystems belonging the watershed the river Cocà - CE (Lagoon Porangabussu, Opaia, Itaperaoba, Maria Vieira, Sapiranga, Maraponga and Lake JacareÃ). Were collected from water in three sections of ecosystems, the period of August/2006 and July/2007, monthly. The variable temperature, turbidity, pH, conductivity, BOD5, COD, DO, TSS, TDS, total ammonia, nitrite, nitrate, phosphorus, alkalinity, hardness and CTT were analyzed. The data were validated, standardized (Z scores) and referred to the program The Unscrambler version 7.5, the Principal Component Analysis - PCA to reduce the data, facilitating the determination of homogeneity: between lagoons and between sampling points in each lagoon. Also evaluate the role of seasonality in water quality of ecosystems. The principal component analysis (PCA) was satisfactory in the reduction of information from the database, making them easier to understand. For the homogeneity between ecosystems only Sapiranga lagoon and Lake Jacareà presented as the other heterogeneous. This is possible mainly due to the influence of the imposed tidal lagoon Sapiranga and lake Jacareà your little fluid intake. The homogeneity is possible according to the input of organic matter, use and occupancy of their areas of influence and the effect of seasonality is common to all. Regarding the factors that determine the quality of water ecosystems, we can say that there is a pattern of pollution by ecosystems. Always determined by the input of organic matter, represented by domestic sewage and diffuse pollution. This degradation is enhanced by two distinct periods: the first rains and the dry season, determining the power of the seasonality that is characteristic of the Northeast. Thus, it is interesting to propose that instead of the collections are made at a monthly frequency, could be performed every six months. Also needed are measures to control the input of organic matter, mainly domestic sewage, since the parameters BOD5, COD, total ammonia and nitrite committed significantly the results offered by the principal components. With regard to the EIT calculated, it is noted that 100% of the sampling ponds were classified as hypereutrophic. Analyzing the variables: BOD5, pH, DO and total phosphorus with CONAMA n  357/05 is observed that in almost all cases the parameters were outside the legal standards. Thus, the necessity causes these ecosystems are part of a view to improving the quality of its waters by an efficient public intervention and presence in the community who enjoys these environments.
3

Advanced techniques for the upgrading of waste stabilisation pond effluent rock filtration; duckweed; and attached-growth media /

Short, Michael Douglas. January 2008 (has links)
Thesis (Ph.D.)--Flinders University, School of Medicine, Dept. of Environmental Health. / Typescript bound. Includes bibliographical references: (leaves 650-698) Also available online.

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