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Remo o de atrazina e metabólitos pela filtra o lenta com leito de areia e carv o ativado granular Removal of atrazine and metabolites through slow filtration by sand and granular activated carbon

Keywords: atrazina , filtra o lenta , carv o ativado granular , metabólitos , atrazine , slow sand filtration , granular activated carbon , metabolites

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Abstract:

A atrazina (ATZ)é um herbicida largamente utilizado no mundo, sendo encontrada associada aos seus produtos de degrada o em águas superficiais e subterraneas. Pertence à classe das s-triazinas e, juntamente com os metabólitos clorados deetilatrazina (DEA) e deisopropilatrazina (DIA), possui potencial carcinogênico e toxicidade como disruptores endócrinos. A limita o dos processos que empregam a coagula o química na remo o de ATZ, a conhecida capacidade do carv o ativado em remover microcontaminantes em água e o risco que a ATZ e seus metabólitos apresentam à saúde motivaram o estudo da filtra o lenta com leito de areia e carv o ativado granular. Os resultados apontaram a eficiência do processo de filtra o lenta com camada intermediária de carv o ativado granular na remo o de ATZ e a limita o deste na remo o dos metabólitos DEA, DIA e deetilhidroxiatrazina (DEHA). Atrazine (ATZ) is widely used as herbicide, commonly found in association to its degradation products in surface water and groundwater. It belongs to the class of s-triazines and together with the chlorinated metabolites dieethylatrazine (DEA) and deisopropilatrazine (DIA) have carcinogenic potential and toxicity as endocrine disruptors. The limitation of the processes employing chemical coagulation in the removal of atrazine, the known ability of activated carbon to remove microcontaminants in water and the risk that atrazine and the potential toxicity to human health of its metabolits motivated the study of slow sand filtration bed combined with granular activated carbon. The results showed the high efficiency of the slow filtration process with intermediate layer of granular activated carbon in the removal of atrazine and its limitation on the removal of the metabolites DEA, DIA and diethylhidroxiatrazine (DEHA).

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