Modelado del efecto del cloro sobre microorganismos floculantes y filamentosos provenientes de barros activados

CARAVELLI A.; CONTRERAS E.; GIANNUZZI L.; ZARITZKY N.

Valencia, Espana

Congreso; III Congreso Iberoamericano de Ingenieria de Alimentos; 2001

ABSTRACTChlorination is the most economical, non-specific method to control the excessive growth of filamentous microorganisms causing bulking in activated sludge systems of industrial food wastes. Considering that chlorination affects both floc-forming and filamentous microorganisms, it is necessary to define the adequate doses to control bulking, minimizing the effect on floc-forming bacteria. Respirometry is a widely used method to evaluate the toxicant effect of different compounds. The objectives of the present work were: a) to evaluate the effect of chlorine in pure cultures of a filamentous microorganism (Sphaerotilus natans ATCC #29329) and a floc-forming bacteria (Acinetobacter anitratus) using respirometric technique to determine the specific sensivity of both microorganisms b) to model chlorine decay at different biomass concentration. The samples were treated with sodium hypochlorite ranging between 2.5 to 18 mgCl2.gSSV-1 in a batch system. The decay of chlorine corresponded to a global second order kinetic equation and a satisfactory agreement between experimental data and the proposed model was observed. The floc-forming microorganism were more sensitive to the assayed doses of chlorine.