Centro Neotropical para Investigación de la Biomasa (CNIB), Colección de Levaduras Quito Católica (CLQCA), Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre 1076 y Roca, Apartado, 17-01-2184, Quito, Ecuador.
Department of Agricultural and Environmental Sciences, EPS, Instituto Universitario de Investigación en Ciencias Ambientales (IUCA), University of Zaragoza, Carretera de Cuarte, s/n, 22071, Huesca, Spain.
Environ Sci Pollut Res Int. 2019 Sep;26(27):28162-28172. doi: 10.1007/s11356-019-06035-8. Epub 2019 Jul 30.
Pollution caused by heavy metals is a prime concern due to its impact on human health, animals, and ecosystems. Cr(VI), generated in a range of different industries as a liquid effluent, is one of the most frequent contaminants. In the work presented herein, the adsorption efficiency of three species of native yeasts from Ecuador (Kazachstania yasuniensis, Kodamaea transpacifica, and Saturnispora quitensis) for Cr(VI) removal from simulated wastewater was assessed, taking Saccharomyces cerevisiae as a reference. After disruption of the flocs of yeast with a cationic surfactant, adsorption capacity, kinetics, and biosorption isotherms were studied. K. transpacifica isolate was found to feature the highest efficiency among the four yeasts tested, as a result of its advantageous combination of surface charge, individual cell size (4.04 μm), and surface area (1588.27 m/L). The performance of S. quitensis was only slightly lower. The remarkable biosorption capacities of these two isolates (476.19 and 416.67 mg of Cr(VI)/g of yeast, respectively) evidence the potential of non-conventional yeast species as sorption microbial particles for polluted water remediation.
重金属污染因其对人类健康、动物和生态系统的影响而成为首要关注点。Cr(VI)作为一种液体废水，在许多不同的工业中产生，是最常见的污染物之一。在本文所介绍的工作中，评估了三种来自厄瓜多尔的本土酵母（Kazachstania yasuniensis、Kodamaea transpacifica 和 Saturnispora quitensis）对模拟废水中 Cr(VI)的吸附效率，以酿酒酵母作为参考。在使用阳离子表面活性剂破坏酵母絮体后，研究了吸附容量、动力学和生物吸附等温线。结果发现，与测试的四种酵母相比，K. transpacifica 分离株的效率最高，这是由于其表面电荷、单个细胞大小（4.04μm）和表面积（1588.27 m/L）的有利组合。S. quitensis 的性能略低一些。这两个分离株的显著生物吸附容量（分别为 476.19 和 416.67 mg 的 Cr(VI)/g 的酵母）证明了非常规酵母作为吸附微生物颗粒对污染水修复的潜力。
