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Evaluación de la bioreducción del cromo hexavalente (VI) en aguas de estero salado con filtros de zuro de maíz (Zea mays) y cascarilla de arroz (Oryza sativa)

Abstract:

Chromium is one of the most common pollutants from industrial activity and of importance due to its high toxicity being the Estero Salado in Guayaquil the main destination of those discharges for that the objective of the present study was the evaluation of the reduction of hexavalent chromium using biofilters of rice husk and corn starch activated with potassium hydroxide 1% m / m. The reduction of the heavy metal in the waters of the Estero Salado will benefit and recover the flora and fauna , also the power to recover this tourist part of the city of Guayaquil as well as to avoid the improper disposal of plant residues and can be used to recover the environment. The adsorption and reduction of hexavalent chromium was studied considering parameters such as pH, contact time, mass of the biofilters, initial toxic concentration in the salty Estero waters and with a standard concentration. The methods used for the determination of hexavalent chromium were the method of diphenylcarbazide and trivalent chromium by atomic absorption spectrophotometry. The previous activation of the biomaterials with potassium hydroxide allowed a greater reduction of hexavalent chromium being more favorable when working at acidic pH. It was proved that both biofilters are able to reduce hexavalent chromium to trivalent and their differences in effectiveness reduction of hexavalent chromium are minimal.