http://lattes.cnpq.br/2473930990867283; http://lattes.cnpq.br/2473930990867283; MIRANDA, Andreza Costa.
Résumé:
The power consumption is a major factor to be considered in operational costs for an
activated sludge system, this because the electric motors commonly used energy
demand to ensure aeration of mixed liquor. In this study we assessed the influence of
the concentration of sludge (biomass) on the oxygen capacity of the aerator. The
oxygen transfer rate was determined in laboratory scale using the dynamic method,
in the presence of microorganisms, using respirometric. In this case, the aerator was
connected to the respirometer that controlled aeration. The respirometer activated
the aerator when the DO concentration reached a lower limit set by disabling it when
it reached an upper limit also established, beginning thus cycles of periods with and
without aeration. The results revealed in systems with mixed liquor sludge with high
concentration of approximately 16 gSST/L o power consumption was at least 2 times
higher than in systems with sludge concentration of around 5 gSST/L. Another study
in this thesis was to evaluate the effect of high salt concentration of the metabolic
activity of the sludge. The metabolic capacity was measured by means of kinetic
constants; maximum growth rate and maximum rate of utilization of organic material,
the salts were gradually added to the effluent in the form of sodium chloride (NaCI).
To determine these rates respirometric method was used in determining the rate of
oxygen consumption. The results showed that the increase in salt caused a loss in
the metabolic activity of up to 60%.