Georgia Institute of Technology, School of Civil and Environmental Engineering, Atlanta, GA 30332-0355, USA.
Chemosphere. 2011 Oct;85(5):848-53. doi: 10.1016/j.chemosphere.2011.06.100. Epub 2011 Jul 28.
This study was carried out to explore the lowest achievable dinitrotoluene (DNT) isomer concentrations that would support sustained growth of DNT degrading microorganisms under an aerobic condition. Studies were conducted using suspended (chemostat) and attached growth (column) systems. The biodegradation limits for 2,4-dinitrotoluene chemostat and column system were 0.054 ± 0.005 and 0.057 ± 0.008 μM, respectively, and for 2,6-dinitrotoluene, the limits for chemostat and column system were 0.039 ± 0.005 and 0.026 ± 0.013 μM, respectively. The biodegradation limits determined in this study are much lower than the regulatory requirements, inferring that bacterial ability to metabolize DNT does not preclude applications of bioremediation (including natural attenuation) for DNT contaminated media.
本研究旨在探索在有氧条件下支持 DNT 降解微生物持续生长的最低可达二硝基甲苯 (DNT) 异构体浓度。研究采用悬浮（恒化器）和附着生长（柱）系统进行。2,4-二硝基甲苯恒化器和柱系统的生物降解极限分别为 0.054 ± 0.005 和 0.057 ± 0.008 μM，而 2,6-二硝基甲苯的生物降解极限分别为 0.039 ± 0.005 和 0.026 ± 0.013 μM。本研究确定的生物降解极限远低于监管要求，这表明细菌代谢 DNT 的能力并不排除 DNT 污染介质的生物修复（包括自然衰减）的应用。
