Malachite green bioremoval by a newly isolated strain Citrobacter sedlakii RI11; enhancement of the treatment by biosurfactant addition

Abstract

Citrobacter sedlackii RI11, isolated from acclimated textile effluent after selective enrichment on synthetic dyes, was assessed for malachite green (MG) biotreatment potency. Results indicate that this bacterium has potential for use in effective treatment of MG contaminated wastewaters under shaking conditions at neutral and alkaline pH value, characteristic of typical textile effluents. Also, the newly isolated strain can tolerate higher doses of dye and decolorize up to 1,000 mg/l of dye. When used as microbial surfactant to enhance MG biodecolorization, Bacillus subtilis SPB1-derived lipopeptide accelerated the decolorization rate and maximized the decolorization efficiency at an optimal concentration of biosurfactant of about 0.075%. Studies ensured that MG removal by this strain could be due to biodegradation and/or adsorption. Results on germination potencies of different seeds using the treated dyes under different conditions favor the use of SPB1 biosurfactant for the treatment of MG.

Reviewing textile wastewater produced by industries: characteristics, environmental impacts, and treatment strategies

“…Furthermore, the textile dye-decolorization effect achieved in the presence of microorganisms could be improved by producing biological surfactants. Mnif et al (2015) reported that lipopeptides derived from Bacillus subtilis SPB1 maximize the decolorization efficiency and accelerate the decolorization rate when the optimal concentrations of biosurfactants are approximately 0.075%. It is essential to summarize the influence of each parameter associated with biodegradation to develop a more effective and faster bacterial degradation method.…”

Methodologies of Removal of Dyes from Wastewater: A Review

“…When used as microbial surfactant to enhance MG biodecolorization, Bacillus subtilis SPB1derived lipopeptide accelerated the decolorization rate and maximized the decolorization efficiency at an optimal concentration of biosurfactant of about 0.075%. Studies ensured that MG removal by this strain could be due to biodegradation and/or adsorption [27].…”

Adsorption Potential of Saccharum Bengalense Retz to Remove Malachite Green Dye from Aqueous Solution

“…Thus, several studies have conducted to sort out an ecological solution to decrease its effect on water resources. Different biological or physicochemical solutions have been used to eliminate distinct contaminants such as pesticides, dyes, heavy metals and other organic matters from water and wastewater as microbiological decolorization [5] chemical precipitation [6] ion-exchange, adsorption, coagulation-flocculation and photocatalytic degradation [7]. These methods have obvious shortcomings, especially the high cost.…”