Abstract

PASTRANA-PACHO, Alicia et al. Coagulación de aguas residuales mediante una mezcla de polvo de Crotalaria longirostrata y sulfato de aluminio. Tecnología en Marcha [online]. 2023, vol.36, n.2, pp.135-142. ISSN 0379-3982.  http://dx.doi.org/10.18845/tm.v36i2.6000.

Natural plant-based coagulants have been used for water treatment since ancient times, and they are friendly with the environment. The objective of this work was to evaluate the turbidity and color removal capacity of a coagulant mixture of Crotaloria longirostrata powder and aluminum sulfate vs aluminum sulfate. The optimal dose of commercial aluminum sulfate (treatments) and the natural coagulant mixtures of C. longirostrata powder and aluminum sulfate were evaluated, that had the highest turbidity and color (independent variable) removal of a domestic wastewater. A PhilesMR brand jar test kit was used to determine optimal coagulant dosages. Turbidity and color were measured with a Lamote brand turbidimeterMR. A simple one-factor completely randomized design was used and an analysis of variance followed by a multiple Tukey test to find statistically significant differences between the different treatments. Mixtures of C. longirostrata powder with aluminum sulfate (75 mg / L of C longirostrata powder + 175 mg / L of sulfate) removed a greater amount of turbidity and color than the optimal dose of aluminum sulfate (250 mg/L) with removals of 83.4% of turbidity and 64.9% of color respectively. The results managed to reduce the use of aluminum sulfate by 30%. The use of C. longirostrata powder as an aid in the removal of turbidity and color does not have toxic effects since it is an edible shrub.

Keywords : Coagulant; flocculation; turbidity; color; jar test; residual water.

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