Evaluación de la remoción de Al, Cd, Co, Cu, Cr, Ni Y Pb de aguas residuales procedentes de la industria de recubrimiento electroquímico por procesos de precipitación química

Abstract

The present work evaluated the removal of Al, Cd, Co, Cu, Cr, Ni and Pb from wastewater from the electrochemical coating industry by chemical precipitation processes. The research methodology used was experimental (field and laboratory phase) and statistical (ANOVA 95%). The experimental part is composed of: field phase in which the APHA method "Standard Methods for examination of water and wasterwater" was used; In the laboratory phase, a preliminary and subsequent water quality analysis was carried out after the application of the flocculant, coagulant and polyelectrolyte study methods; in the metal analysis phase (Al, Cd, Co, Cu, Cr, Ni and Pb), it was carried out by the graphite furnace atomic absorption spectrophotometry method and COD multiparameter photometer, making a total of 14 samples with 3 repetitions for each metal and for the evaluation it was based on the AM097-A standard for sewage. The initial concentrations of the water quality parameters in the chromium, nickel and neutralizer rinses were not within the norm, so their concentration was evaluated with the application of the 3 methods (PAC, ferric chloride and aluminum sulfate), obtaining as a result that aluminum sulfate is the only one that allows the water quality parameters to reach the standard for the neutralizing rinse.