Department of Environmental Science & Engineering, Indian Institute of Technology (ISM) Dhanbad, Dhanbad, Jharkhand, 826 004, India.
Sci Rep. 2021 May 25;11(1):10864. doi: 10.1038/s41598-021-90137-2.
In this study, a bacterial strain Serratia sp. was employed for the reduction of synthetically prepared different concentration of Cr(VI) solution (10, 25, 40, 50 and 100 mg/L). Cometabolism study have been carried out in the binary substrate system as well as in the tertiary substrate system. The results revealed that when glucose was added as a co-substrate, at low Cr(VI) concentration, complete reduction was achieved followed by increased biomass growth, but when Cr(VI) concentration was increased to 100 mg/L, the reduction decline to 93%. But in presence of high carbon iron filings (HCIF) as co-substrate even at higher Cr(VI) concentration i.e. 100 mg/L, 100% reduction was achieved and the cell growth continued till 124 h. The study was illustrated via Monod growth kinetic model for tertiary substrate system and the kinetic parameters revealed that the HCIF and glucose combination showed least inhibition to hexavalent chromium reduction by Serratia sp.
在这项研究中，使用了一种细菌菌株产硷菌（Serratia sp.）来还原不同浓度的合成 Cr(VI)溶液（10、25、40、50 和 100 mg/L）。在二元基质系统和三元基质系统中进行了共代谢研究。结果表明，当添加葡萄糖作为共基质时，在低 Cr(VI)浓度下，实现了完全还原，随后生物量增长增加，但当 Cr(VI)浓度增加到 100 mg/L 时，还原下降到 93%。但是，在存在高碳铁粉（HCIF）作为共基质的情况下，即使在更高的 Cr(VI)浓度（即 100 mg/L）下，也实现了 100%的还原，并且细胞生长持续到 124 小时。通过三元基质系统的 Monod 生长动力学模型说明了该研究，动力学参数表明，HCIF 和葡萄糖的组合对产硷菌还原六价铬的抑制作用最小。
