Simultaneous removal of selenite and heavy metals from wastewater and their recovery as nanoparticles using an inverse fluidized bed bioreactor

Riboflavin secreted by Shewanella sp. FDL-2 facilitates its reduction of Se(iv) and Te(iv) by promoting electron transfer

“…(2022) 16 and Mal et al (2017), 17 respectively. In addition, the electron transport system activity (ETSA) was detected according to a previously reported method.…”

“…For Se 0 and Te 0 measurements, the pellets were washed with 1 M NaCl three times to remove Se( iv )/Te( iv ) and then treated with sonication (30 s sonication, 30 s pause, 30 min) in an ice bath; after that, the pellet was centrifuged (6000 rpm, 8 min), the supernatant was discarded, and the pellet was washed twice with 10 mL of NaCl (1 M), resuspended in 1 mL of Na 2 S (1 M, red solution for Se 0 measurement) or 1 mL of KOH (1 M, black solution for Te 0 measurement), and finally determined at 500 nm and 340 nm. 9 Se( iv ) and Te( iv ) concentrations were measured at 500 nm and 340 nm following the methods described by Arindam et al (2022) 16 and Mal et al (2017), 17 respectively. In addition, the electron transport system activity (ETSA) was detected according to a previously reported method.…”

Thermodynamic insights into selenium oxyanion removal from synthetic flue gas desulfurization wastewater with temperature-swing solvent extraction

“…Current industrial efforts for selenium removal are mainly based on biological and chemical approaches, whereas physical methods (e.g., nanofiltration and reverse osmosis) have not captured much attention from industries due to the operational and maintenance costs (Ali and Shrivastava, 2021). Some advanced bioreactors, such as inverse fluidized bed bioreactors, granular sludge reactors, and hybrid bioreactors, displayed excellent Se-reducing bacterial activities, followed by the moderate recovery efficiency of selenium nanoparticles in a single-stage system (Cordoba and Staicu, 2018;Sinharoy and Lens, 2020;Sinharoy et al, 2022). Nevertheless, high sensitivity to variations in feed components and long operating periods of bioremediation unfavorably hinder its practical applications (Gingerich et al, 2018).…”