Avaliação da aplicação de acido folico em tratamento aerobio de aguas residuarias. / Evaluation of application of folic acid in aerobic wastewater treatment .

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

They are deficiency of vitamins in sludge of biological wastewater treatment, especially the folic acid, that acts as micronutrient for certain bacteria and stimulating its growth. This work evaluated the effect of different concentrations of folic acid on the sludge in normal physiologic conditions and in endogenous respiration. The system was carried out batch reactor at 25ºC±2ºC, air flow of 0,5 L/min and using synthetic wastewater, being accompanied COD, pH and Total Solids, Fixed Total Solids, Volatile Total Solids and visualization in optic microscope. The results were compared to the control. The results demonstrated that the concentrations of 4,0 and 8.0 mg/L of folic acid produce improvement in the microfauna of the system of activated sludge, and the concentration of 8,0 mg/L was still capable to increase the speed of removal of COD in the normal physiologic conditions of the sludge and in the endogenous respiration. The concentration of 4,0 mg/L presented similar statistical result to the concentration of 8,0 mg/L for the initial condition of the endogenous respiration sludge, improving the speed COD removal. The pH and the COD removal did not have alterations provoked by the addition of the folic acid.

ASSUNTO(S)

respiração endogena endogenous respiration aerobic digestion acido folico lodo ativado digestão aerobia folic acid activated sludge

ACESSO AO ARTIGO

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