Abstract

Opinion In the last years we had worked in the use of slow sand filters for the decontamination of biodigesters effluents and the sugar mill oxidation lagoons. The work was carried out with the objective of eliminating the contamination of these effluents located in some sugar mills as: “Carlos Baliño”, “George Washington” and “Melanio Hernández”. The effluents were taken in the central region of Cuba (Santo Domingo, Manacas, Villa Clara and Tuinicú, Sancti Spíritus). The effluents were proven to passing through by the slow sand filter in cascades before different investigated treatments. The effluents were diluted in distilled water in the different proportions: T1 (10%), T2 (25%), T3 (50%), T4 (75%), T5 and T6 (not diluted). In the effluents, they were determined: their physical-chemical and microbiological characteristics, previous and later to passing through by the slow sand filters.