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GONÇALVES, C.P. (2008). Impact of sludge disposal of septic tanks on Wastew ater Treatment Plant with Upflow Anaerobic Sludge Blanke t (UASB). Sao Carlos, 2008. Dissertation (Master) – Sao Carlos Engineering Scho ol, University of Sao Paulo. The performance of upflow anaerobic sludge blanket (UASB) in the sanitary wastewater combined treatment with sludge disposal of septic t anks was evaluated in this work. The study was carried out (full scale) in the Wastewate r Treatment Plant (WTP) located in Campus I of the University of Sao Paulo (USP), city of Sa o Carlos, State of Sao Paulo, Brazil. Two UASB reactors were used; volume of each reactor ~ 18,8 m3. UASB I was the control reactor, and UASB II was the reactor in which the septic sludge was disposed. The research was divided in two steps: the first on e, which has taken into account the beginning of reactors operation and, the second one , in which occurred the disposal of septic sludge in the reactors. The start-up was car ried out without utilization of inoculums. Reactors were operated with an average h ydraulic retention time of 8 hours, average influent flow rate of 2.35 m3.h , and upflow velocity of 0.6 m.h . In six months, reactors presented average removal efficiencies of COD in UASB I and UASB II of 48% and 65%, respectively. Concerning to the solid remo val, UASB I and UASB II have achieved removal of 36% and 37% for TS, and 67% and 63% for TSS, respectively. After this period of time, the evaluation of disposal imp act of septic sludge was started in UASB II. Three essays with different sludge volume (1, 3, and 5 m3) were carried out; sludge volume was disposed in a pulse way with aver age flow rate of 5.24 m3.h . Septic sludge utilized in the research was collected by “c lean septic tank” trucks, and disposed in a reservoir (volume of 15 m3) in WTP, in order to a ll w further disposal in the UASB II. By the hand of characterization of septic sludge sa mples (collected when disposal was carried out), it was possible to verify the heterog eneity about composition of this kind of waste and its availability in terms of anaerobic po st-treatment. Temporal monitoring after the sludge disposal was carried out in order to all w the accompaniment of results provided by the pulse. In general, UASB reactor pr esented capacity in terms of degradation of approximately 2/3 of the organic loa d disposed with septic sludge. The results are a good indicative that the disposal of septic sludge in UASB reactors is a viable solution, and it is very important for the t r atment of wastes from septic tanks.

Impacto do lançamento de lodo de tanques/fossas sépticas em estação de tratamento de esgoto com reator anaeróbio de fluxo ascendente e manta de lodo (UASB)