College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, Zhejiang, China.
Sci Rep. 2021 Jan 8;11(1):114. doi: 10.1038/s41598-020-80053-2.
Pyrene and chromium (Cr(VI)) are persistent pollutants and cause serious environmental problems because they are toxic to organisms and difficult to remediate. The toxicity of pyrene and Cr(VI) to three crops (cotton, soybean and maize) was confirmed by the significant decrease in root and shoot biomass during growth in pyrene/Cr(VI) contaminated hydroponic solution. Two bacterial strains capable of simultaneous pyrene biodegradation and Cr(VI) reduction were isolated and identified as Serratia sp. and Arthrobacter sp. A mixture of the isolated strains at a ratio of 1:1 was more efficient for biotreatment of pyrene and Cr(VI) than either strain alone; the mixture effectively carried out bioremediation of contaminated water in a hydroponic system mainly through pyrene biodegradation and Cr(VI) reduction. Application of these isolates shows potential for practical microbial remediation of pyrene and Cr(VI) combined water pollution.
芘和铬（Cr(VI)）是持久性污染物，由于它们对生物有毒性且难以修复，因此会造成严重的环境问题。在受芘/ Cr(VI)污染的水培溶液中生长时，三种作物（棉花、大豆和玉米）的根和地上生物量显著减少，证实了芘和 Cr(VI)的毒性。从同时进行芘生物降解和 Cr(VI)还原的两种细菌菌株中分离并鉴定出了沙雷氏菌属和节杆菌属。将分离株以 1:1 的比例混合用于生物处理芘和 Cr(VI)比单独使用任何一种菌株都更有效；该混合物通过芘生物降解和 Cr(VI)还原有效地对水培系统中的污染水进行了生物修复。这些分离株的应用表明，它们具有用于实际微生物修复芘和 Cr(VI)复合水污染的潜力。
