ROLE OF BROWN-ROT FUNGI IN THE BIOREMOVAL OF AZO DYES UNDER DIFFERENT CONDITIONS

Ano: 2010 | Volume: 41 | Número: 4

Autores: Naeem Ali, Abdul Hameed, Safia Ahmed

Palavras-chave: Azo dyes, Bio-removal, Bio-decolorization, culture conditions, Fungi

Resumo Inglês:

The present study is vital to the understanding of bioremediation of structurally different azo dyes by some
unusual Brown-rot fungi. Bioremoval of each dye (20 mg l-1) was tested in two different culture media
under static and shaking conditions by taking inocula from different fungi. Fungal strains showed varying
dyes removal abilities, though considerable high in case of Acid Red (AR) 151(di-azo) as compared to
Orange (Or) II (mono-azo). With an exception of Aspergillus tereus SA3, all the fungal isolates showed
higher removal of dyes in SDB. Under static condition, the maximum decolorizing fungal strains were;
Aspergillus flavus SA2 (67%) and Alternaria spp. SA4 (57%) in AR 151, while Penicillium spp. (34 and
33 %) in Orange II, in SDB and STE, respectively. Bioremoval of dyes was considerably increased when
experiments were shifted from static to shaking mode. It was specifically increased (%) in; AR 151 (255)
with Penicillium spp., Or II with A. flavus SA2 (112) and Alternaria spp. (111). The primary mechanism of
dyes removal proved to be fungal biosorption. However, reduction of dyes (onto fungal) with formation of
their products (
. naphthol, sulphalinic acid and aniline) furthermore revealed that dyes (specifically azo)
were actually biodegraded.