Background: Brazil suffers from a lack of basic sanitation in many regions, intensified in the Amazon region due to its difficult access. The application of natural coagulants is a promising alternative since it eliminates the use of chemicals, is a simple, low-cost method that is easy to reproduce, and is accessible to any community, thus promoting health and environmental improvements. On the other hand, the use of chemical coagulants can cause harm to the environment and human health. Aim: Therefore, the objective of this study was to evaluate the coagulation effect of a species of Amazonian cactus applied in the treatment of water for human consumption. Methods: For the study, about 500 grams of the aerial part of the Cereus jamacaru was collected on the banks of the BR 174 in the region of Roraima. The spines were removed in the laboratory, the plant material was washed, cut to a thickness, dried in an oven at 60 °C for 36 hours, then ground and sieved until obtaining a powder, which was tested as a natural coagulant. The water used in the study was collected from the Branco River in Boa Vista, Roraima, and characterized its initial turbidity. Results: The dosage of 0.2g of the natural cactus coagulant showed a significant reduction in the turbidity of the study water, leaving it within the potability standards established for groundwater. Discussion: Coagulation in the sanitary context is evidenced by the removal of microscopic particles associated with pathogenic microorganisms, normally found in raw water and with very low sedimentation speed. Replacing polluting chemical substances with natural coagulants in the treatment of water for human consumption contributes to the quality of life. Conclusion: The Amazonian cactus Cereus jamacaru demonstrated coagulation efficiency for analyzing the turbidity parameter of water for human consumption.
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