Microbial selenite reduction with organic carbon and electrode as sole electron donor by a bacterium isolated from domestic wastewater

Selenite Reduction and the Biogenesis of Selenium Nanoparticles by Alcaligenes faecalis Se03 Isolated from the Gut of Monochamus alternatus (Coleoptera: Cerambycidae)

“…It is an essential micronutrient for both prokaryotes and eukaryotes at low concentrations, but it can be toxic to organisms at higher levels [ 2 ]. For example, Se can act as an antioxidant and protect against the cellular damage caused by oxygen radicals; however, an overdose of Se can disrupt the integrity of proteins and decrease cellular enzymatic activity, resulting in chronic or acute selenosis [ 3 , 4 ]. Se exists in nature in multiple organic and inorganic forms, two of which there are mobile, water-soluble, bioavailable and toxic: selenite (SeO 3 2− ) and selenate (SeO 4 2− ).…”

“…Therefore, the reduction of both selenate and selenite to Se 0 has been identified as an ideal strategy for selenium detoxification and Se recovery in contaminated water, soil, and industrial effluent [ 7 ]. While various physicochemical and biological methods have been applied to reduce selenate and selenite into Se 0 [ 8 , 9 , 10 ], biological approaches are generally preferred due to additional benefits such as their low cost, eco-friendly nature, and ability to employ self-generating catalysts [ 4 ]. Microorganisms thus play a crucial role in the transformation of selenite and selenate via metabolic reactions, and a variety of microorganisms, including Duganella sp.…”

Opportunities for groundwater microbial electro‐remediation

“…However, a different approach for dealing with Se, which is commonly found as selenite [Se(IV)], has been tested in METs. In this case, selenite was successfully reduced to elemental selenium in microbial biocathodes, which allowed its immobilization (Catal et al ., ; Nguyen et al ., ). Moreover, the finding that the well‐known electroactive Shewanella oneidensis MR‐1 has the ability to convert Se(IV) into Se(0) opens the door for more investigations on selenium‐contaminated groundwater treatment (Li et al ., ).…”

Selenate removal in biofilm systems: effect of nitrate and sulfate on selenium removal efficiency, biofilm structure and microbial community

“…The composition of the growth medium, according to Tan et al, 14 was as follows (in g L -1 ): NH 4 Cl (0.30), CaCl 2 •2H 2 O (0.10), MgCl 2 •6H 2 O (0.01) and NaHCO 3 (0.04). Phosphate buffer (0.053 g L -1 Na 2 HPO 4 and 0.041 g L -1 KH 2 PO 4 ) was included in the medium to maintain near neutral pH (7)(8) conditions. Acid and alkaline trace metal solutions (0.1 mL each, as described in Stams et al 17 ) were added to 1 L of synthetic wastewater.…”

“…6 The biological process converts the soluble Se oxyanions to insoluble and less toxic Se 0 , 7 which can potentially be recovered and reused for various industrial applications, such as fertilizers for Se-deficient soils or use in photovoltaic cells. 8,9 Despite the recent advances in the biological treatment of Se-laden wastewaters, there are still many knowledge gaps in the application of the treatment, particularly when considering the complexity of Se-laden wastewaters. One of the challenges of Se-laden wastewaters, such as mining effluents, is the presence of other oxyanions, such as NO 3 and SO 4 2-, that are typically present in concentrations more than 100 to 1000 times greater than Se.…”