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The objective of this study was to evaluate the applicability of tannins natural coagulants, Tanfloc SG and SH, in coagulation / flocculation process for clarification, as post-treatment of effluent from a dairy industry aiming its reuse. Determined pH and optimal dosage of coagulant activity through jar test, in dosages ranging from 10- 60 mg.L-1 and pH range 3 – 9. The optimum conditions defined by statistical analysis of the values of turbidity removal were, for Tanfloc SG dosage of 20 mg.L-1 and pH 6 and the Tanfloc SH dosage of 20 mg.L-1 and pH 5. According to the parameters defined in technical standard for wastewater reuse, both treated effluent have the potential for reuse in irrigation of orchards, pastures, among others, by runoff or irrigation system off, and the treated effluent with Tanfloc SH has potential also discharges for reuse in toilets.