Banca de DEFESA: GUSTAVO MARQUES CALAZANS DUARTE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : GUSTAVO MARQUES CALAZANS DUARTE
DATA : 25/05/2018
HORA: 14:00
LOCAL: Sala de Aula do LARHISA
TÍTULO:

SIMULATION AT PILOT PLANT OF THE COMPLETE CYCLE WTP ADJUSTMENT FOR DOUBLE FILTRATION

PALAVRAS-CHAVES:

Double filtration. Water treatment. Aadequacy of water treatment.

PÁGINAS: 64
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Sanitária
RESUMO:

There are water treatment plants (WTP) that operate with hydraulic overload, for example ETA Extremoz, located in the state of Rio Grande do Norte, which treats water whith flow rate equal to 700 L / s, that is, it operates with hydraulic overload in relation to its design flow of about 30%. Although the project indicates full-cycle technology, ETA Extremoz operates with direct filtration technology and the structures of the flocculators and decanters act as passage boxes and at this scenario, the construction of the second module in complete cycle technology is not feasible economically and technically. The renovate of structures currently inoperative to function as pre-oxidation chambers (flocculators) and gravel ascending filters (FAP) (ie decanters), adapting the complete cycle technology for double filtration (DF) with gravel pre-filter and sand filter, for a flow of 1,000 L / s, is an alternative that results in significant financial and spatial savings for a possible expansion of WTP. The objective of this paper is to evaluate, in a pilot plant, the operational conditions for adequacy of WTP Extremoz to the dual filtration technology, maintaining and taking advantage of the existing WTP structure and verify the treatment technology for the current water flow rate (700 L / s) and future (1000 L / s). The research consisted of two phases, the first one evaluated treatment behavior by the DF technology in the filtration rates of 190, 210, 230 and 255 m³.m-².dia-1 for FAP and 250, 280, 310 e340 m³ .m-².dia-1 for the sand filters in pilot-plant trials with eight-hour trials. The results obtained in the first phase indicated the FAP 3 as the one with the best performance and that the filtration rates studied did not significantly affect the quality of the filtered effluent. From then on, a deeper investigation was carried out into the behavior of FAP 3 and fast sand filters, in pilot tests with a filtration rate of 230 and 255 m³.m-².dia-1 for the three prefilter and 310 and 340 m³.m-².dia-1 and trials with 24 hours duration. From the analysis of the obtained data it was concluded that despite the performance similar to the other FAP, the pre-filter FAP3 presented better efficiency and the lower averages of turbidity and apparent color remaining and the FAP1 was the worse performance. The performance of the FDA was statically equivalent, however, because it had a higher filtration rate than the others, the FDA3 was the filter with granulometry more adequate to the treatment of raw water. Turbidity peaks were recorded in the prefiltered water after DFI and in the filtered water after washing the sand filters. In all tests, the final load loss of the FAP was less than 0.60 m (maximum available load of 240 cm), a result indicated that the hydraulic load expected for the pre-filter could be lower than that indicated in the literature. The double filtration with upward gravel filter is indicated for the treatment of water with turbidity up to 300 uT, however, a good preconditioning of the water to be treated was essential. The increase of the filtration rate did not influence the performance of the pre-filters, however filtration rates between 200 and 300 m3.m-2.dia-1 was the range chosen because it reduces costs of unit implantation. The major influencer in the total charge loss of FAP3 is the false bottom. The lower layers of FAP3 did not contribute to the removal of turbidity and color. The FAP proved to be an equalizer in the quality of the influent water of the sand filters. For the studied filtration rates the grain size of the FDA does not generate different effluents from each other.

MEMBROS DA BANCA:
Presidente - 1222082 - ADA CRISTINA SCUDELARI
Interno - 376.950.452-68 - ANDRE LUIS CALADO ARAUJO - IFRN
Externo à Instituição - MARCO ANTÔNIO CALAZANS DUARTE - IFRN
Externo à Instituição - RUI DE OLIVEIRA - UFCG