ABSTRACT Serratia sp. strain SU.ISM.1 was isolated from Noamundi iron ore mines for the first time and was observed for hexavalent chromium reduction, and growth kinetics modelling was applied for bacterial chromium reduction. For 4–8 ppm of hexavalent chromium concentration, complete reduction was observed within 36 h when the selected isolate was applied, and for 12–20 ppm chromium concentration, complete reduction was achieved within 48 h. The viable biomass concentration increased up to 36 h of treatment time, after which the biomass concentration gradually declined. The Aiba model of product inhibition growth kinetics best described the growth of biomass in the presence of hexavalent chromium. The total mass conversion of Cr(VI) to Cr(III) for 4, 8, 12, 16 and 20 ppm was found to be 94.9%, 88.5%, 74.66%, 70.75% and 78.8%, respectively. The AFM and FESEM studies showed that the roughness of the cell surface increased with increasing concentration of hexavalent chromium, probably due to adsorption of chromium. GRAPHICAL ABSTRACT

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沙雷氏菌的评估。从铁矿石中分离出六价铬还原：细胞形态学的动力学、命运和变化

摘要 沙雷氏菌。菌株 SU.ISM.1 首次从 Noamundi 铁矿中分离出来，并观察到六价铬的还原，并将生长动力学模型应用于细菌铬的还原。对于 4-8 ppm 的六价铬浓度，当应用所选分离物时，在 36 小时内观察到完全还原，而对于 12-20 ppm 的六价铬浓度，在 48 小时内实现完全还原。活生物量浓度增加到 36 小时的处理时间，之后生物量浓度逐渐下降。产物抑制生长动力学的 Aiba 模型最好地描述了在六价铬存在下生物质的生长。发现 4、8、12、16 和 20 ppm 的 Cr(VI) 到 Cr(III) 的总质量转化率分别为 94.9%、88.5%、74.66%、70.75% 和 78.8%。AFM 和 FESEM 研究表明，电池表面的粗糙度随着六价铬浓度的增加而增加，这可能是由于铬的吸附。图形概要