Remoção de compostos orgânicos causadores de gosto e odor em águas de abastecimento em sistemas pós-filtros adsorvedores de carvão ativado granular. / Removal of taste and odor producing organic substances in water supply in post-filter granular activated carbon adsorber systems.

AUTOR(ES)

Carolina Alves de Souza Ferreira

DATA DE PUBLICAÇÃO

2009

RESUMO

The main purpose of this research was to study the performance of granular activated carbon post filter adsorbers made of bituminous coal and vegetal coal (coconut), regarding, mainly, removal of 2-methylisoborneol and trans-1,10-dimethyltrans- 9-decalol. The experimental researches were conducted in the water treatment plant Alto da Boa Vista, using four pilot filters, made in acrylic, with an internal diameter of 14.2 cm and a filter media depth of 1.5 m, each. Two of them (named 1 and 3) were filled with the carbon Filtrasorb 300 (CALGON) and the other two (named 2 and 4), with the carbon 119 12x25 (CARBOMAFRA). The filters operated in parallel, 24 h per day, 7 days per week. The filters 3 and 4 were fed with filtered water from the plant and the filters 1 and 2, with filtered plus ozonated water. The average hydraulic loading rate in the filters was 143 m3m2.d and the empty bed contact time, 15 min. The average detention time in the ozone contact columns was 21 min and the average ozone dosage, 1.11 mgL. The 2-methylisoborneol values in the filtered water of the plant were higher than in the ozonated water, which indicates that the ozonation reduced (average of 53.4 %) this substance. The filter that showed the lower values of 2-methylisoborneol was the bituminous one, fed with ozonated water (filter 1), with an average removal of 50.6 %. Moreover, was the only one that presented average values of 2-methylisoborneol lower than the odor threshold concentration ( 9,0 ngL). The filter that presented the higher values of 2- methylisoborneol was the vegetal one, fed with filtered water (filter 4).

ASSUNTO(S)

biological filters carvão ativado activated carbon filtros biológicos ozone ozônio

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