College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, Zhejiang Province, China.
Environ Sci Pollut Res Int. 2021 Sep;28(33):45619-45628. doi: 10.1007/s11356-021-13893-8. Epub 2021 Apr 19.
Hexavalent chromium (Cr(VI)) and pyrene are toxic pollutants that are difficult to remediate from soils and wastewater. Serratia sp. strains have been previously demonstrated to remove either Cr(VI) or pyrene and here a new isolate, called the Z6 strain, was demonstrated to remove both simultaneously. The removal occurs primarily by Cr(VI) reduction and pyrene biodegradation, and genome analysis suggests the removal mechanisms are the putative chromate reductase and two assumable pathways of pyrene degradation. The Z6 strain effectively removed most Cr(VI) (up to approximately 86%) and pyrene (up to approximately 57%) in seven different types of wastewater after 7 days of biotreatment. Additionally, the carrier loofa used for bacteria immobilization did not change the kinetics of Cr(VI) reduction or pyrene degradation. The carrier loofa was also effective for multiple uses, with removal capacity not being significantly affected over the first seven cycles with the same carrier loofa. These results provide data for developing practical biotreatment applications of Cr(VI) and pyrene contaminated sites.
六价铬（Cr(VI)）和芘是两种难以从土壤和废水中修复的有毒污染物。先前已经证明，变形菌属（Serratia sp.）菌株可以去除 Cr(VI)或芘，而这里新分离出的菌株 Z6 被证明可以同时去除这两种污染物。去除过程主要通过 Cr(VI)还原和芘生物降解来实现，基因组分析表明去除机制是假定的铬酸盐还原酶和两种假定的芘降解途径。在 7 天的生物处理后，Z6 菌株在 7 种不同类型的废水中有效地去除了大部分 Cr(VI)（高达约 86%）和芘（高达约 57%）。此外，用于细菌固定化的载体丝瓜络不会改变 Cr(VI)还原或芘降解的动力学。载体丝瓜络也可以多次有效使用，在使用同一种载体丝瓜络的前 7 个循环中，去除能力没有受到显著影响。这些结果为开发 Cr(VI)和芘污染场地的实用生物处理应用提供了数据。
