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Biopolymers have significant influences and regulatory effect on microbial mineralization processes and precipitate characteristics. In this study, xanthan gum (XG) served as the biopolymer, and Klebsiella aerogenes was utilized as the carbonate mineralizing bacterium, the regulatory effects and mechanisms of XG concentrations on the precipitation yield, particle size, crystalline polymorph, and morphological characteristics of calcium carbonate precipitation induced by K. aerogenes were explored systematically. The results showed that when the calcium concentrations were 0.25 mol/L and 0.50 mol/L, and the XG concentrations were 0.50 g/L and 0.75 g/L, respectively, the precipitation yield of calcium carbonate was 25.00% and 9.60% greater than that of the control group, respectively. With the amount of XG addition increasing, at low calcium concentrations (0.25 mol/L), the proportion of calcite decreases and the proportion of vaterite increases, and gradually to be stabilizing. At high calcium concentration (0.50 mol/L), the proportion of calcite tends to increase first and then to decrease, whereas the proportion of vaterite tends to decrease and then gradually to stabilize. Compared with those of the control group, the average particle sizes of the calcium carbonate crystals in the two calcium concentrations groups decreased by 44.50% (0.25 mol/L) and 64.40% (0. 50 mol/L). Meanwhile, the addition of XG promoted the formation of spherical or spheroidal-like calcium carbonate morphology. These findings provide a new strategy for the precise and customized regulation of microbial mineralization.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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