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Previous issue date: 2017-03-24 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) === Os res?duos gerados nas Esta??es de Tratamento de ?gua (ETA) s?o formados principalmente pelo lodo de decantadores e pela ?gua de lavagem dos filtros - ALF. A ALF representa a maior parcela de perda de ?gua, podendo compreender a at? 10% da vaz?o da esta??o. Uma alternativa para a destina??o desses res?duos ? a recircula??o na pr?pria esta??o. Dessa forma, al?m de representar uma redu??o nas perdas da esta??o, tamb?m diminui o consumo de energia e de ?gua. A presen?a de part?culas desestabilizadas em sua constitui??o e o residual de coagulante presentes na ALF podem auxiliar a remo??o de part?culas da ?gua bruta. Para que o reaproveitamento dos res?duos n?o prejudique a qualidade da ?gua tratada, ? essencial a avalia??o dos impactos causados por esse procedimento. O trabalho foi desenvolvido na ETA de Extremoz ? RN, que apresenta configura??o de esta??o convencional, apesar de operar como filtra??o direta. O presente estudo investigou as seguintes configura??es para recircula??o do efluente da lagoa de sedimenta??o, ALF bruta (isto ?, sem clarifica??o) e ap?s clarifica??o. Foram avaliadas diferentes taxas de recircula??o (0, 2, 5 e 8%) atrav?s de ensaios de tratabilidade no jarteste. Foram simulados tratamentos com as configura??es de filtra??o direta e filtra??o direta em linha, com e sem a etapa de oxida??o, utilizando diferentes doses de coagulante e oxidante. A ?gua bruta utilizada caracteriza-se por apresentar turbidez e cor em torno de 2 unT e 20 uH, respectivamente. A etapa de flocula??o n?o foi necess?ria, enquanto que a etapa de oxida??o foi essencial para se atender ao valor limite estabelecido pela legisla??o. A recircula??o da ALF n?o influenciou na qualidade da ?gua tratada, n?o apresentando diferen?a significativa entre os tipos de res?duos nem entre as taxas de recircula??o adotadas. === The residues generated in the Water Treatment Plants (WTP) are mainly formed by the sedimentation and the filter backwash water (FBWW). The FBWW represents the largest portion of water loss, and may comprise up to 10% of the station's flow. An alternative to the destination of this waste is the recirculation in the station itself. In this way, besides representing a reduction in the losses of the station, it also reduces the consumption of energy and water resources. The presence of destabilized particles in their constitution and the residual coagulant present in the FBWW can aid the removal of particles from the raw water. In order to ensure that the reuse of waste does not adversely affect the quality of the treated water, it is essential to assess the impacts caused by this procedure. The work was developed in WTP of Extremoz - RN, which presents conventional configuration but operates as direct filtration. The present study compared the recirculation of sedimentation pond effluent with crude FBWW, that is, without any type of treatment, and after being clarified in the laboratory - simulating a filler. The performance of recirculation at different recirculation rates (0, 2, 5 and 8%) was investigated through treatability tests in the reservoir. The raw water used is characterized by turbidity and color around 2 unT and 20 uH, respectively. The flocculation step was not necessary, whereas the oxidation step was essential to meet the limit value established by the legislation. The recirculation of the different residues in the different recirculation ratios did not influence the quality of treated water.
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