Kao C M, Prosser J
National Sun Yat-Sen University, Institute of Environmental Engineering, Kaohsiung, Taiwan, ROC.
J Hazard Mater. 1999 Oct 1;69(1):67-79. doi: 10.1016/s0304-3894(99)00060-6.
Activities at a former fire training area at Robins Air Force Base in Georgia, USA resulted in contamination of groundwater with a mixture of trichloroethylene (TCE) and chlorobenzene (CB). Results from the field investigation suggest that intrinsic bioremediation process is occurring, which caused the decrease in TCE and CB concentrations, and increase in TCE degradation byproducts [e.g., dichloroethylene isomers (DCEs), vinyl chloride (VC)] concentrations. Contaminated groundwater samples collected from this site were used to conduct microbial enumeration tests, and used as the inocula for microcosm establishment. Results from the microbial enumeration study indicate that methanogenesis was the dominant biodegradation pattern within the source and mid-plume areas, and the aerobic biodegradation process dominated the downgradient area. Laboratory microcosm experiments were conducted to evaluate the feasibility of using CB as the primary substrate to enhance the intrinsic biodegradation of TCE. Microcosm results suggest that CB can serve as the primary substrate (electron donor), and enhance TCE biodegradation to less-chlorinated compounds under both aerobic cometabolism and reductive dechlorination conditions.
美国佐治亚州罗宾斯空军基地一处 former fire training area 的活动导致地下水被三氯乙烯(TCE)和氯苯(CB)的混合物污染。现场调查结果表明,自然生物修复过程正在发生,这导致了 TCE 和 CB 浓度的降低,以及 TCE 降解副产物[如二氯乙烯异构体(DCEs)、氯乙烯(VC)]浓度的增加。从该场地采集的受污染地下水样本用于进行微生物计数测试,并用作建立微观世界的接种物。微生物计数研究结果表明,产甲烷作用是源区和羽流中部区域的主要生物降解模式,而好氧生物降解过程在下游区域占主导地位。进行了实验室微观世界实验,以评估使用 CB 作为主要底物来增强 TCE 自然生物降解的可行性。微观世界实验结果表明,CB 可以作为主要底物(电子供体),并在好氧共代谢和还原脱氯条件下将 TCE 生物降解为低氯化合物。