Utilização de parâmetros reológicos para verificar a aptidão ao desaguamento de lodos de uma estação de tratamento de esgotos do tipo UASB+BF's condicionados com polieletrólitos
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2003-12-19
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Braga, Walace Marcelino
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Universidade Federal do Espírito Santo
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This research aims at the rheological description of the sludge produced by an UASB + BAF wastewater treatment works and evaluates the application of the rheological parameters on the selection of polyeletrolyts, and it’s optimal dose, used to increase the sludge’s dehydration ability. The tests with raw sludge included rotational rheo-viscosimetry, cup with a hole kinematic-viscometry, besides pH and solid contents measurements. The falling sphere rheo-viscometry was used on the raw sludge filtrate and sludge conditionated with cationic, anionic and non ionic polymers filtrate, both obtained through a Búchner funnel. This data was later compared with data obtained by classic methods, such as Specific Resistance to Filtration (SRF), Time of Capillary Suction (CST) and the solid content. The electrical conductivity and turbidity were also measured on the mentioned filtrates. The results obtained indicate that the rheology of the sludge produced on the WWTP - UFES agrees with the pseudoplastic model with shear stress limit (HERSCHEL-BULKLEI). The thixotropic model was put in evidence and the rheological parameters were found to agree with what was expected for this kind of material. It was also found that there is a good correlation between those parameters and the solid content in the sludge. The results obtained for the filtrate viscosity, as well as those from CST and the SRF tests, show that the cationic polymer is the best auxiliary in the dewatering of this kind of sludge. This research shows that it is possible to use the rheological parameters and apparent viscosity in the control of the processes involved in disposing the sludge in a way that does not damage the environment, once the tests and essays used in this research can be easily and quickly reproduced
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BRAGA, Walace Marcelino. Utilização de parâmetros reológicos para verificar a aptidão ao desaguamento de lodos de uma estação de tratamento de esgotos do tipo UASB+BF's condicionados com polieletrólitos. 2003. 172 f. Dissertação (Mestrado em Engenharia Ambiental) - Universidade Federal do Espírito Santo, Centro Tecnológico, Vitória, 2003.