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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

Indicadores ambientais do complexo hÃdrico PapicÃ/MaceiÃ, Fortaleza-CearÃ. / Environmental pointers of the Papicu/Maceià draining water system

Paulo Roberto Ferreira Gomes da Silva 19 November 2003 (has links)
FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico / A presente dissertaÃÃo identifica e analisa as condiÃÃes ambientais do Complexo HÃdrico Papicu/Maceià com o ropÃsito de verificar sua situaÃÃo atual, e propor medidas alternativas para minimizar os impactos ambientais negativos detectados nessa Ãrea. A identificaÃÃo desses impactos no sistema Ãdrico em estudo, teve seu inÃcio com levantamentos cartogrÃficos e observaÃÃes de campo sendo, posteriormente, levantadas as condiÃÃes ambientais por meio da determinaÃÃo da qualidade da Ãgua e sedimento, analisando-se os parÃmetros fÃsicos e quÃmicos em amostras coletadas nas estaÃÃes chuvosa e de estiagem. A anÃlise dos sedimentos em relaÃÃo ao tamanho de grÃo, realizado pelo mÃtodo do peneiramento, apresenta uma classificaÃÃo textural que varia de areia mÃdia a fina. Os parÃmetros fÃsico-quÃmicos da Ãgua referentes a turbidez, cor e odor indicam que esses Ãndices variaram de acordo com os perÃodos chuvoso e de estiagem. Os valores de turbidez abrangeram de 3,5 uT a 39,0 uT no perÃodo de elevada luviosidade e 2,0 uT a 6,5 uT no perÃodo de estiagem. As observaÃÃes da cor indicaram Ãndices superiores a 25,0 uH. O odor apresentou caracterÃsticas de sulfÃdrico a vegetal. Os resultados da demanda bioquÃmica de oxigÃnio mostram que os valores para o perÃodo chuvoso variaram de 14,0 a 53,0 mg/L e para o de estiagem de 4,8 a 37,2 mg/L, estando acima do limite de 5,0 mg/L estabelecido pela ResoluÃÃo 20/86 do CONAMA. Esses dados indicam que esse complexo hÃdrico està recebendo efluentes de origem domÃstica. Os valores do oxigÃnio dissolvido variam de 2,6 a 4,0 mg/L, sendo que nas amostras analisadas da Lagoa do Papicu verifica-se a ausÃncia desse elemento. De acordo com a ResoluÃÃo acima referida, os valores de oxigÃnio dissolvido, em qualquer amostra deve ser superior a 2,0 mg/L, dessa forma somente o corpo hÃdrico, Lagoa do Papicu, està fora dos padrÃes estabelecidos pela resoluÃÃo. A anÃlise dos parÃmetros fÃsico-quÃmicos da Ãgua envolvendo potencial hidrogeniÃnico, alcalinidade e dureza revelam que os valores encontrados estÃo compatÃveis com as caracterÃsticas ambientais da Ãrea de estudo. Os valores de nitrito, nitrato e amÃnia nÃo estÃo, de modo geral, dentro dos padrÃes estabelecidos pela ResoluÃÃo 20/86 do CONAMA. Medidas mitigadoras e corretivas sÃo propostas para eliminar os impactos negativos configurados e preservar a qualidade ambiental do complexo hÃdrico Papicu/MaceiÃ. / The present masterâs thesis identifies and analyzes the environmental conditions of the Papicu/Maceià draining water system as an attempt to evaluate their present situation and to put forward alternative measure to lower the environmental negative impacts dedected in that region. This case study actually started with a cartographic survey and field observations which later carried on with the determination of water and sediment quality by estimating physical and chemical parameters by means of samples collected during the dry and rainy seasons. Sediments analyzed as to its grain size, through the sifting technique, went into a textural classification as median to fine sand. Physical-chemical parameters of the water in relation to turbidity, color and smell varied according to the dry and rainy seasons. Turbidity values ranged from 3,5 uT to 39,0 uT during the rainy season and 2,0 uT to 6,5 uT during the dry season, the color presented indices upwards of 25,0 uH and the smell showed sulphyde and vegetable characteristics. The values of biochemical demand for oxygen varied in the ranges of 14,0 â 53,0 mg.L-1 and 4,8 â 37,2 mg.L-1, respectively during the rainy and dry seasons, therefore well above the 5,0 mg.L-1-limit set up by CONAMAâs Act no 20/86. This is an indication that the studied water system has been receiving domestically-produced effluents. The dissolved oxygen content ranged from 2,6 mg.L-1 to 4,0 mg.L-1, but the Papicu lakelet was shown to be totally devoid of that element. Since that, according to the above-mentioned Act the oxygen content in any samples must be higher than 2,0 mg.L-1, only on the water body Papicu lakelet this parameter was found to be below that standard limit. Other water physical and chemical parameters, such as pH, alcalinity and hardness showed values which are compatible with the environmental features of the study area. Nitrite, nitrate and ammonia contents are not, in general within the standard limits of CONAMAâs Act no 20/86. Amendatory and mitigating guidelines are proposed aiming at ruling out evident negative impacts and at preserving environmentâs quality of Papicu/Maceià draining water system.

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