Influência da glicose sobre o consumo de fenol por Aspergillus niger an 400 em reatores em batelada / The influence of glucose on the phenol consumption by Aspergillus niger an 400 in batch reactors

RESUMO

Aspergillus niger AN 400 foi inoculado em reatores em batelada para remoção de fenol de meio sintético, na presença e ausência de glicose. O experimento possuía 5 reatores de controle (grupo 1) com meio contento apenas fenol; 5 reatores (grupo 2) inoculados com fungos e com meio com fenol e sem glicose; e 5 reatores (grupo 3) inoculados com fungos e com meio com fenol e glicose (5 g/L). Os reatores foram agitados a 200 rpm, a 30ºC, durante 5 dias. A concentração média inicial de fenol foi de 323 mg/L e a de matéria orgânica, de 696 mg DQO/L, meio sem glicose, e 6058 mg DQO/L, meio com glicose. Os reatores do grupo 2 removeram 48 por cento de fenol e 21 por cento de DQO, enquanto que os reatores do grupo 3, 100 por cento de fenol e 93 por cento de matéria orgânica. Não houve redução significativa de fenol e de DQO nos reatores de controle. A assimilação foi a via principal de remoção de fenol.

ABSTRACT

Batch reactors were inoculated with Aspergillus niger AN 400 to remove phenol from synthetic media with and without glucose. The experiment was set by five blank reactors (group 1) with media containing only phenol; five reactors (group 2) inoculated with fungi and with media containing only phenol; and five reactors (group 3) inoculated with fungi and with media containing phenol and glucose (5 g/L). These reactors were kept at 30ºC under stirring of 200 rpm during 5 days. The mean initial concentrations of phenol and COD were 323 mg/L and 696 mg COD/L for the media without glucose, and 6058 mg COD/L for the media containing glucose. The reactors of group 2 removed 48 percent of phenol and 21 percent of COD, while the reactors of group 3 removed 100 percent of phenol and 93 percent of COD. There was no significant reduction of phenol and COD in the blank reactors. The assimilation was the main pathway of phenol removal.