This research had as its main purpose the evaluation of the use of natural coagulate, obtained from Moringa oleifera seeds and their efficiency in the slow direct filtration and sedimentation processes for the treatment of highly turbid water. In developing countries such as Brazil, technologies for water treatment must provide the possibility of water purification in an easy, self-maintainable and low cost process, for people who live in regions characterized by shortage of drinking water. Studies so far suggest that there is a potential application of Moringa oleifera in the water treatment with slow direct filtration. A flocker composed of a PET bottle and three filters composed of similar bottles with nonwoven synthetic blanket were used in the slow filtration, with a discharge of affluent water to the filters of approximately 4 m3 m-2 d-1. In the water treatment process evaluation of the sedimentation efficiency, a flocker composed of PET bottles and a sedimentation tank was used. The water used for these experiments was the synthetic water obtained by bentonite, which presents adequate qualitative characteristics for the analysis.136765771Amagloh, F.K., Benang, A., Effectiveness of Moringa oleifera seed as coagulant for water purification (2009) African Journal of Agricultura Research, 4 (1), pp. 119-123Amaral, L.A., Rossi Júnior, O.D., Soares e Barros, L.S., Lorenzon, C.S., Nunes, A.P., Tratamento alternativo da água utilizando extrato de semente de Moringa oleifera e radiação solar (2006) Arquivos do Instituto Biológico, 73 (3), pp. 287-293Azevedo Netto, J.M., Parlatore, A.C., Rossin, A.C., Manfrini, C., Hespanhol, I., Campos, J.R., Povinelli, J., Yaguinuma, S., (1987) Técnica de abastecimento e tratamento de água, 2, p. 317. , 3.ed. São Paulo: CETESB/ASCETESBBezerra, A.M.E., Momenté, V.G., Medeiros Filho, S., Germinação de sementes e desenvolvimento de plântulas de moringa (Moringa oleifera Lam.) em função do peso da semente e do tipo de substrato (2004) Horticultura Brasileira, 22 (2), pp. 295-299Dalsasso, R.L., Sens, M.L., Filtração direta com pré-floculação e coagulação com sulfato de alumínio e hidroxicloreto de alumínio: Estudo com água de manancial eutrofizado (2006) Engenharia Sanitária e Ambiental, 2 (3), pp. 241-249Di Bernardo, L., Botari, A., Sabogal-Paz, L.P., Uso de modelação matemática de floculação em série em estações de tratamento de água (2005) Revista Engenharia Sanitária e Ambiental, 10 (1), pp. 82-90Di Bernardo, L., Brandão, C.C.S., Heller, L., (1999) Tratamento de águas de abastecimento por filtração em múltiplas etapas, p. 114. , Rio de Janeiro: ABES/PROSABDi Bernardo, L., Dantas, A.D.B., (2005) Métodos e técnicas de tratamento de água, 2. , 2.ed. São Carlos: Rima EditoraKatayon, S., Noor, M.J.M.M., Asma, M., Ghani, L.A.A., Thamer, A.M., Azni, I., Ahmad, J., Suleyman, A.M., Effects of storage conditions of Moringa oleifera seeds on its performance in coagulation (2006) Bioresource Technology, 97, pp. 1455-1460Leme, F.P., (1982) Engenharia do saneamento ambiental Rio de Janeiro: LTC Livros Técnicos e Científicos, p. 354Muyibi, S.A., Evison, L.M., Moringa oleifera seeds for softening hardwater (1995) Water Research, 29 (12), pp. 1099-1104Muyibi, S.A., Evison, L.M., Optimizing physical parameters affecting coagulantion of turbid water with Moringa oleifera seeds (1995) Water Research, 29 (12), pp. 2689-2695Ndabigengesere, A., Narasiah, K.S., Talbot, B.G., Active agents and Mechanism of coagulation of turbid waters using Moringa oleifera (1995) Water Research, 29 (2), pp. 706-710Ramos, R.O., (2005) Clarificação de água com turbidez baixa e cor moderada utilizando sementes de Moringa oleifera, , Campinas: UNICAMP, Tese DoutoradoSilva, F.J.A., Matos, J.E.X., Sobre dispersões de Moringa oleifera para tratamento de água (2008) Revista Tecnologia, 29 (2), pp. 157-163Thomas, D.N., Judd, S.J., Fawcett, N., (1999) Flocculation modelling: A review. Water Research, 33 (7), pp. 1579-1592Vianna, M.R., (2002) Hidráulica aplicada às estações de tratamento de água, p. 576. , 4.ed. Belo Horizonte: Imprimatur