Efficacy of Acinetobacter sp. B9 for simultaneous removal of phenol and hexavalent chromium from co-contaminated system

Abstract

The present study shows the feasibility of a newly isolated strain Acinetobacter sp. B9 for concurrent removal of phenol and Cr (VI) from wastewater. The experiments were conducted in a batch reactor under aerobic conditions. Initially, when mineral salt solution was used as the culture medium, the strain was found to utilize phenol as sole carbon and energy source while no Cr (VI) removal was observed. However, the addition of glucose as co-carbon source resulted in the removal of both toxicants. This co-removal efficiency of the strain was further improved with nutrient-rich media (NB). Optimum co-removal was determined at 188 mg L(-1) of phenol and 3.5 mg L(-1) of Cr (VI) concentrations at pH 7.0. Strain B9 followed the orthometabolic pathway for phenol degradation. Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) studies showed sorption of chromium as one of the major mechanisms for Cr (VI) removal by B9 cells. Acinetobacter sp. B9 was later on checked for bioremediation of real tannery wastewater. After 96 h of batch treatment of tannery effluent containing an initial 47 mg L(-1) phenol and 16 mg L(-1) Cr (VI), complete removal of phenol and 87 % reduction of Cr (VI) were attained, showing high efficiency of the bacterial strain for potential application in industrial pollution control.

Simultaneous adsorption of Cr(VI) and phenol onto tea waste biomass from binary mixture: Multicomponent adsorption, thermodynamic and kinetic study

“…Cr(III) is toxic to plants at 17 higher concentrations and less toxic to animals or living beings [6]. Cr 18 (III) is in the form of oxides, hydroxides or sulphates and less mobile 19 than Cr(VI) [7]. Phenol is toxic aromatic organic compound and weak 20 biodegradable pollutant [8].…”

Simultaneous Bioremediation of Phenol and Cr (VI) from Tannery Wastewater Using Bacterial Consortium

“…The tannery effluent especially originating from tanning processes contains a huge quantity of pollutants including organic matter, phenolics, tannins, and chromium and possesses serious health and environmental threats (Chandra et al, 2011;Bhattacharya et al, 2014). Thus, treatment of tannery wastewater is a prerequisite before discharging it into the environment.…”

“…Leather manufacturing involves huge quantity of toxic and hazardous chemicals that are used in different steps of processing (Chandra et al, 2011;Bhattacharya et al, 2014). The effluents from these industries thus contain lots of these chemical contaminants.…”

Sustainable Options for Mitigation of Major Toxicants Originating from Electronic Waste

“…As e-waste is known to possess mixed pollutants in the form of heavy metals and recalcitrant organic pollutants, its bioremediation approach becomes quite complicated [13][14][15] . Both pollutants are different in nature and there are different mechanisms of detoxification of these pollutants by microorganisms.…”

“…Both pollutants are different in nature and there are different mechanisms of detoxification of these pollutants by microorganisms. The co-presence of toxicants in case of e-waste further enhances the toxicity to microbes and also affects the bioremediation of individual components 14,15 . Hence, in order to use microorganisms for remediation of complex or co-contaminated system, they must possess tolerance and detoxification abilities towards different types of pollutants.…”