Integrating coagulation-flocculation and UV-C or HO/UV-C as alternatives for pre- or complete treatment of biodiesel effluents.

The feasibility of biodiesel effluent treatment combining coagulation-flocculation with a photolytic process was evaluated, being the photolytic process involving the irradiation of the effluent by UV-C, or by UV-C irradiation with simultaneous addition of HO (HO/UV-C). The coagulation-flocculation was performed at the natural pH of the effluent (pH 2.9) using different Fe salts (chloride, nitrate and sulfate) at different concentrations (0.