INBIOTEC   24408
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y BIOTECNOLOGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Application of hydrogen peroxide to the control of eutrophic lake systems in laboratory assay
Autor/es:
BAUZÁ LETIZIA; AGUILERA ANABELLA; RICARDO ECHENIQUE; DARÍO ANDRINOLO; LEDA GIANNUZZI
Lugar:
Jhoanesberg
Reunión:
Conferencia; 9th International Conference on Toxic Cyanobacteria; 2013
Resumen:
Hydrogen Peroxide (H2O2) can be an effective treatment for both cyanobacteria and their toxins and is considered an environmentally benign reagent. The objective of the present work was to study the effect of H2O2 addition on the parameters of eutrophication and cyanobacteria populations. We used water from the Los Patos shallow lake (Ensenada, Province of Buenos Aires, Argentina) and tested five doses of H2O2, in the range 4.89.10-3- 9.79.10-2 mM. The parameters evaluated at 0, 2, 8, 24 and 48 h, in presence and absence of light, were: pH, conductivity, total dissolved solids (TDS), turbidity, total phosphorus (TP) and soluble (Ps), chemical oxygen demand (COD), chlorophyll-a and phytoplankton counts. The major cyanocidal effect occurred at 8 hours, with the aplication of 9.79 10-2 mM dose under light. The number of cyanobacteria decreased -0,34 cycles log (2,1 107 cell/ml to 9,4106 cell/ml). At 48 hours treatment, with and without ligh, the inhibitory effect disappeared. Significant variations were recorded in the content of clorophyll-a, showing a decline in function of the dose added. At 48 hours, H2O2 produced no changes in the SDT, conductivity, Ps and Pt. A short time of application of H2O2 was effective in the removal of COD. Such effect was greater under light, indicating the need of new pulses every 24 hours in order to remove COD. These results indicate that light stimulates the effects of H2O2 on the degradation of chlorophyll and the cyanocidal effect.