Abstract:
Wastewater from textile industry effluents contains high amounts of colored
and toxic compounds that can interrupt aquatic life systems when they are discharged
to the environment without being treated. The physicochemical characteristics
of effluents typically have a wide range of pHs and salinities, which are difficult
for conventional techniques to remove. In addition, a limited number of microorganisms
with the ability to grow and produce degradative enzyme systems can survive
under those condition. Therefore, identifying microorganisms that are capable
of decolorizing and degrading textile dyes under various pHs and salinities
is needed. Among the fifteen strains tested in this study, Pestalotiopsis
sp. NG007 exhibited the strongest ability to grow and decolorize Reactive
Red 4 under saline conditions at pH 8. The ability of this strain to decolorize
three textile dyes: Reactive Green 19, Reactive Orange 64 and Reactive Red 4,
was investigated in a liquid medium and bioreactor system using immobilized
mycelia. The fungus displayed a high decolorization capacity (20-98%) over 3
days in a wide range of pHs (pH 3-12) and salinities (0-10% w/v). In the bioreactor
system, immobilized mycelia of the strain exhibited the ability to decolorize
textile dyes by both adsorption (6-53%) and degradation (34-41%) mechanisms.
This study demonstrated that Pestalotiopsis sp. has the potential to
decolorize textile dye effluents containing a wide range of pHs and salinities.
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