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TORRES, D.P.C. Microbiologic study of activated sludge process with chemical addition of folic acid. 2005. 183 f. Dissertação (Mestrado) Escola Politécnica, Universidade de São Paulo, São Paulo, 2005. The folic acid is a essential vitamin to metabolism and growth of the cells by promoting the synthesis of proteins for the cellular division. According to some researches, this application in the activated sludge systems can contribute to in the optimization of the biological treatment. The experimental part of this work was developed in two stages: aerobic respirometry biotests, in order to evaluate the effects of the addition of folic acid in the metabolic activity of the microbiotica of activated sludge; and operation of a pilot plant of activated sludge, to evaluate the influence of the folic acid in microorganisms’s dynamics and the performance of the treatment. In the respirometric bioassays was eminence the consumption of oxygen with addition of the highest concentration tested was added 4.0 mg/L of folic acid, where the consumption of up to 78% of oxygen was observed, whereas in the control the flocs the consumption was 50%. The composed Dosfolat, employee in the concentration 2,5 mg/L, also contribute the microbiota’s activity of the of sludge, as observed by the consumption of 100% of the present oxygen after 24 hours of incubation of the respirometric systems. In the activated sludge systems, the folic acid and Dosfolat didn't exercise influence in the efficiency of the treatment and in the production of sludge. In relation to the aspects of the microbiology, the addition of both solutions didn’t cause differences on the composition and microorganisms’s diversity, and it didn't influence the dynamics of growth of the filamentous bacterias. Even so, the reactors that received addition of folic acid and Dosfolat the flocs presented superior sizes, and improve morphologic characteristics in relation to sludge of the control reactor. Therefore, the breathing rates observed with addition of folic acid and of Dosfolat in activated sludge systems indicate a tendency of incentive of the metabolic activity as answer to the increment of folic acid. Besides this factor, suggests that the use of both solutions favors bacteria growth of the flocs and this formation of these, in detriment to the free bacterias.

Estudo microbiológico da influência da adição química de ácido fólico em sistemas de lodos ativados.