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The septic sludge contains high concentrations of suspended solids, oils and greases, organic material and pathogenics. Generally, in some regions or cities, this kind of sludge is discharged without the appropriate care in Wastewater Treatment Plants (WWTP), which may lead to overload on them. The objective of this research was to design, construct and evaluate a treatment pilot plant to be used for prior treatment of the sludge generated in septic tanks. This pilot plant, composed by a sieve, a degritter, and flotation devices, was assembled in the São Paulo University Campus in São Carlos – SP– Área 1, near the Wastewater Treatment Plant (WWTP) of this Campus. It had the purpose to remove suspended solids, sand and the floating material before their entry in the Wastewater Treatment Plant. The pilot plant was managed to work at different surface rates (80; 110; 140 and 200 m3 m-2 day-1). The 110 m3 m-2 day-1 rate displayed the highest removal efficiency, reaching 91.7% of suspended solids, 89.3% of the Chemical Oxygen Demand, and 81.9% of oils and greases; without addition chemicals. The results showed the applicability of this system in removing suspended solids, oils and greases. Additionally, it was evaluated the capability of degrade the floated material by aerobic or anaerobic processes. The aerobic digestion of the floated material was efficient when it received previous inoculation and aeration period greater than 20 days, which allowed COD removal of 88.3% and 90% of oils and greases. Palavras-chave: lodo de fossa e tanque séptico; pré-tratamento de lodo; flotação; degradação anaeróbia; degradação aeróbia

Pré-tratamento de lodo de tanques sépticos mediante flotação, antes do lançamentos em ETEs