Eficiência do policloreto de alumínio e QUIMITRAT CO no tratamento de efluente de lavanderia

Abstract

Treating industrial effluents is essential to minimize the environmental impacts caused by improper disposal, especially in laundries, which generate waste with high organic and inorganic loads. This study evaluates and compares the efficiency of different doses of polyaluminum chloride (PAC) coagulants and QUIMITRAT CO in the treatment of laundry effluents, focusing on turbidity removal and pH impact. The choice of QUIMITRAT CO is justified by its high efficiency in turbidity removal and organic load reduction, characteristics guaranteed by the supplier who developed the product for this type of effluent. The methodology included the preparation and application of coagulant solutions at various concentrations: for PAC, the doses used were 0.3 mL/L, 0.6 mL/L, 0.9 mL/L, 1.2 mL/L, and 1.5 mL/L; for QUIMITRAT CO, the doses were 0.2 mL/L, 0.4 mL/L, 0.6 mL/L, 0.8 mL/L, and 1.0 mL/L. The coagulation conditions were simulated in a laboratory setting, and the results were analyzed through physicochemical tests, such as pH measurement, turbidity, chemical oxygen demand (COD), and biochemical oxygen demand (BOD5). The results showed that QUIMITRAT CO was more efficient in turbidity removal, with an average reduction of 92.4% at a dose of 0.6 mL/L, while PAC, at the same dose, achieved a reduction of 83.1%. Additionally, QUIMITRAT CO showed less variation in the pH of the effluent, with an average fluctuation of ±0.15 units, while PAC showed variations of ±0.35 units, indicating the need for further adjustments. The BOD5 and COD values were also analyzed. QUIMITRAT CO showed a significant reduction in BOD5, with an average reduction of 75%, while PAC achieved a reduction of 67%. Regarding COD, QUIMITRAT CO achieved a reduction of 90%, while PAC obtained a reduction of 80%. These results indicate that QUIMITRAT CO is more efficient in turbidity removal and performs better in reducing organic load without needing pH corrections.