Made available in DSpace on 2014-12-17T15:03:34Z (GMT). No. of bitstreams: 1 DanilloLMF_DISSERT.pdf: 2643693 bytes, checksum: e8aa0f4d4535d4002a68928f7529ab75 (MD5) Previous issue date: 2014-03-07 / In the state of Rio Grande do Norte (RN), Brazil, there are about 80 sewage treatment systems being the predominant technology waste stabilization ponds. The Baldo s WWTP , due to its location and low availability of area, was designed as a hybrid conventional system (UASB reactor followed by activated sludge with biodiscs) at a tertiary level, being the most advanced WWTP in the State and also with the larger treatment capacity (1620 m3/h) .The paper presents the results of its performance based on samples collections from May to December 2012. Composite samples of the effluent of the grit chamber, UASB reactors, anoxic chambers, aeration tanks and treated effluent were collected weekly, every 4 hours for 24 hours. The results showed that the WWTP effluent presented adequate ranges of temperatures, pH and DO, however removal efficiencies of BOD and TSS were below the predicted by design. The UASB reactors also showed removals of BOD and TSS less than expected, due to the accumulation of sludge in the reactors, which eventually, was washed out in the effluent. The nitrification process was not satisfactory mainly due to problems in the oxygen distribution in the aeration tanks. The removal of ammonia and TKN were high, probably by the assimilation process / No Rio Grande do Norte (RN), Brasil existe cerca de 80 sistemas de tratamento de esgotos sendo a tecnologia das lagoas de estabiliza??o a predominantemente utilizada. A ETE do Baldo, devido a sua localiza??o e disponibilidade de ?rea foi concebida como um sistema convencional h?brido (UASB lodos ativados com biodiscos) em n?vel terci?rio, sendo a ETE mais avan?ada do Estado e com maior capacidade de tratamento (1620 m 3 /h). O trabalho apresenta os resultados do seu monitoramento, atrav?s de coletas realizadas semanalmente no per?odo de junho a dezembro de 2012, com base em amostras compostas coletadas a cada 4 horas, durante 24 horas, do efluente da caixa de areia, reatores UASB, c?maras an?xicas, tanques de aera??o e efluente tratado. Os resultados mostraram que a ETE apresentou efluentes com temperaturas, pH e OD adequados, entretanto efici?ncias abaixo do projetado para os par?metros DBO e SST. Os reatores UASB tamb?m apresentaram remo??es de DBO e SST abaixo do esperado, devido ao ac?mulo de lodo nos reatores, uma vez que, este era expelido no efluente. O processo de nitrifica??o n?o foi satisfat?rio, pelas baixas concentra??es de nitrato encontradas nos efluentes dos tanques de aera??o, provavelmente por problemas no sistema de aera??o. As remo??es de am?nia e NTK foram altas, provavelmente pelo processo de assimila??o