Macrolobium acaccifolium and Inga nobilis species, found in Amazon forest, are used for local timber purposes. In this context, the seeds can be considered waste. Thus, this work proposes the application of these seeds in coagulation/flocculation processes. The efficiency of organic coagulants extracted from seeds of Macrolobium acaccifolium and Inga nobilis species was evaluated using the Jar Test equipment. Coagulation/flocculation assays were performed and the Parameters: color, turbidity, organic matter and pH parameters were measured to raw and the treated water. For Inga nobilis seeds, the best results were achieved using Treatment 2, with an efficiency of 14.81% in color removal was obtained; 51.28% of turbidity removal efficiency; pH remained within the range between 6 and 8. On the other hand, in Treatment 4, the pH remained at an average of 5. For Macrolobium acaciifolium seeds, using Treatment 3, an efficiency of 39.33% and 78.72% in color and turbidity removal was obtained, respectively. For this seeds, pH presented values within the range between 5 and 6. Therefore, it can be concluded that the coagulant extracted from Macrolobium acaciifolium was more effective compared to the coagulant extracted from Inga nobilis. However, treated water cannot be considered as potable water as it is out of potability standards.
Key words: Organic coagulant, water treatment, efficiency.