Evaluation of performance ofPlanococcussp. TRC1 an indigenous bacterial isolate monoculture as bioremediator for tannery effluent

Abstract

A B S T R A C TAn indigenous bacterial isolate Planococcus sp. TRC1 was found to tolerate Cr(VI) solution up to 500 mg/L concentration when grown in mineral salt media. Gene sequencing of the isolated strain using 16S rDNA technique and phylogenetic analysis confirmed that the species was 96% close to Planococcus maritimus (KP8). Studies on cell dynamics in batch bioreactor showed the maximum specific cell growth rate (μ max ) to be 0.276 h −1 . Removal of Cr(VI) was observed to be dependent on initial chromium concentration and the maximum removal of Cr(VI) (75 ± 3%) was obtained at 25 mg/L Cr(VI) solution for an incubation period of 72 h. Above this value, the removal of Cr(VI) was declined. Scanning electron microscope and Fourier transform infrared spectroscopic studies indicated that the Cr(VI) removal took place by the adsorption process on the cell outer membrane. It is observed that the adsorption process follows the Freundlich adsorption isotherm (R 2 = 0.987). Planococcus sp. TRC1 reduced 80 ± 5% chemical oxygen demand (COD) of tannery effluent (COD 7,270 ± 45 mg O 2 /L) within 48 h of batch treatment. The elimination of cytotoxicity and genotoxicity imparted by the raw tannery effluent and Cr(VI) solution after bacterial treatment is an important observation which reflects the eco-friendly behavior of the Planococcus sp. TRC1 mediated tannery effluent and aqueous Cr(VI) solution treatment. The results revealed the applicability of Planococcus sp. TRC1 in both tannery waste and Cr(VI) reduction without affecting our environment.

Advanced Oxidation Processes and Biotechnological Alternatives for the Treatment of Tannery Wastewater

“…[ 176 ] and Dunaliella salina [ 177 ], among others. The ability of microalgae to use compounds present in wastewater reducing the pollutant load, strengthening the formation of metabolites and generating considerable amounts of oxygen that allow the proliferation of other microorganisms that contribute to the improvement of water quality makes them an interesting tool in wastewater treatment [ 178 , 179 , 180 , 181 ]. The adaptive capacity of microalgae, together with their ability to bioaccumulate heavy metals, allows them to be used as a potential system in the treatment of tannery wastewater.…”

Evaluation of the Light/Dark Cycle and Concentration of Tannery Wastewater in the Production of Biomass and Metabolites of Industrial Interest from Microalgae and Cyanobacteria

“…have been tested for their ability to grow in different types of wastewater [1,19,20]. In these systems, algae transform hazardous nutrients into biomass which can be later used to extract other metabolites, making it an interesting biotechnological tool for use in wastewater treatment [21,22] Another essential characteristic of these microorganisms is their capacity to bioaccumulate heavy metals, which may increase their potential as a sustainable alternative for the treatment of tannery wastewater [23][24][25].…”

Effective bioremediation and toxicity assessment of tannery wastewaters treated with indigenous bacteria

“…(Mandal et al 2010), Planococcus sp. (Behera et al 2016), Stenotrophomonas sp. (Raman et al 2018), Penicillium sp.…”