Abstract
Effect of mangrove-derived Aplanochytrium sp., was studied for the removal of malachite green in 5rtfaqueous solution under controlled experimental conditions. The dye removal was measured at regular interval by measuring its color intensity. This was confirmed further by Fourier Transform Infra Red (FT-IR) and also to find out the change in the chemical groups. To enhance the dye removal, a statistical optimization was done by two phases of response surface methodology (RSM): (i) Plackett-Burman design for selection of the important process enhancing factors of dye removal, such as pH, temperature, incubation period, dye concentration, glucose, peptone and yeast extract and (ii) Centre composite design to study optimized condition, interaction and combined effect of the selected factors on dye removal. Aplanochytrium sp., was found to remove the azo-dye significantly up to 86.32% within five and half days of incubation under optimized conditions of pH 7.8 and at temperature of 27.8°C. This study proved that mangrove-derived Aplanochytrium sp., was found promising for its potential of synthetic dye removal Key words: Mangroves, bioremoval, malachite green, Aplanochytrium sp and response surface methodology.
Highlights
Chemical dyes are widely used in many industries related to paper, printing, textile and leather industries (Korbahti and Rauf, 2008a)
To enhance the dye removal, a statistical optimization was done by two phases of response surface methodology (RSM): (i) Plackett-Burman design for selection of the important process enhancing factors of dye removal, such as pH, temperature, incubation period, dye concentration, glucose, peptone and yeast extract and (ii) Centre composite design to study optimized condition, interaction and combined effect of the selected factors on dye removal
This study proved that mangrove-derived Aplanochytrium sp., was found promising for its potential of synthetic dye removal
Summary
Chemical dyes are widely used in many industries related to paper, printing, textile and leather industries (Korbahti and Rauf, 2008a). During natural removal of the azo-dyes, some toxic chemicals are produced and they are highly carcinogenic and mutagenic to the flora and fauna (Bali et al, 2004). In order to remove the toxic dye chemicals, many treatment methods are applied. The methods include flocculation, coagulation, activated carbon adsorption, membrane filtration and sedimentation. These methods are not successful due to several reasons: (i) the chemicals are only partially degraded; (ii) the azo-dyes are converted into the toxic metabolites and (iii) the toxic chemi-cals are just converted to the secondary solid wastes due to their complex binding structure; and this secondary waste has to be either treated again or dumped as such (Behnajady et al, 2006)
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