A água de retrolavagem dos filtros (ARF) de estações de tratamento de água (ETA) é composta por resíduos da água bruta, produtos químicos e microrganismos. Seu descarte inadequado impacta negativamente o meio ambiente e a saúde da população humana. Objetivando caracterizar a ARF da ETA de Blumenau-SC, foram realizadas avaliações físico-químicas, microbiológicas e parasitológicas e testes com diferentes polímeros floculantes, afim de propor estratégias para tratamento e reuso deste resíduo para posteriormente, o líquido tratado, ser lançado no Rio Itajaí-Açu (Classe 2). Grande parte das análises físico-químicas e microbiológicas apresentaram resultados superiores aos determinados pela Resolução CONAMA n° 430/2011, além de positividade para cistos de Giardia duodenalis (Assembleia B) e oocistos de Cryptosporidium spp., caracterizando um resíduo poluído e contaminado que não deve ser lançado in natura no corpo hídrico. O polímero floculante aniônico apresentou resultados satisfatórios na redução da turbidez da amostra (99,49%), podendo ser uma alternativa promissora no tratamento deste resíduo.
Palavras-chave: Cryptosporidium spp., Giardia spp., resíduo de ETA.
Filter Backwash Water (FBW) from water treatment plants (WTP) is composed of raw water waste, chemicals and microorganisms. Inappropriate disposal of this residue impacts negatively in the environment and in the health of human populations. Aiming to characterize the FBW from one WTP of Blumenau-SC, physiochemical, microbiological and parasitological assessments and tests with different flocculants polymers were performed in order to propose strategies for treatment and reuse of this residue. Subsequently treated liquid is discharged into the Itajaí-Açu River (Class 2). Physicochemical and microbiological analyses showed results higher than those permitted by CONAMA Resolution n° 430/2011 and Giardia duodenalis (Assembly B) cysts and Cryptosporidium spp. oocyst positivity was observed, characterizing as polluted and contaminated residue that shouldn't be released in the hydric body. The anionic flocculant polymer showed satisfactory results in the turbidity sample reduction (99.49%), which may be a promising alternative in the treatment of this residue.
Filter Backwash Water (FBW) from water treatment plants (WTP) is composed of raw water waste, chemicals and microorganisms. Inappropriate disposal of this residue impacts negatively in the environment and in the health of human populations. Aiming to characterize the FBW from one WTP of Blumenau-SC, physiochemical, microbiological and parasitological assessments and tests with different flocculants polymers were performed in order to propose strategies for treatment and reuse of this residue. Subsequently treated liquid is discharged into the Itajaí-Açu River (Class 2). Physicochemical and microbiological analyses showed results higher than those permitted by CONAMA Resolution n° 430/2011 and Giardia duodenalis (Assembly B) cysts and Cryptosporidium spp. oocyst positivity was observed, characterizing as polluted and contaminated residue that shouldn't be released in the hydric body. The anionic flocculant polymer showed satisfactory results in the turbidity sample reduction (99.49%), which may be a promising alternative in the treatment of this residue.
