| 浅层地下水中氯代烷烃生物降解的地下水化学
响应规律研究 |
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| 关键词:groundwater biodegradation chloralkane solvents groundwater chemistry response |
| 基金项目:中国地质调查局地质调查项目“东北平原地下水污染调查评价综合研究及专题研究工作项目”(编号: 1212010913004) |
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| 摘要: |
| Groundwater Chemistry Response Regularity of Natural Biodegradation of Chloralkane Solvents in Shallow Groundwater |
| Based on groundwater chemical monitoring data obtained from a certain oilfield in Northeast China, the authors analyzed trends of groundwater chemical indicators which act as first matrix, electron acceptors and related reduction product for biodegradation in the pollution halo at different sites and periods, and then made qualitative evaluation of chloralkane solvents degradation degree. The results shows that, in June 2010, about one year after the accident happened, the water chemical components such as electron acceptors (SO42–), first matrix (CH2Cl2, CHCl3) and the main physicochemical index (pH, Eh) increased from the upper reaches to the lower reaches in ZK1-ZK3-ZK6 longitudinal section. However, the related reduction products (Fe2+, Mn2+, HCO3–) decreased in the same direction, implying that the natural degradation had a certain lag. Degradation evaluation shows that, in June 2010, ZK1 well reached sufficient evidence level, ZK3 well reached limited evidence level, and ZK6 well reached insufficient evidence level. With the migration of the pollution halo and the processing of biodegradation, in May 2011, biodegradation in ZK3 well became more obvious and groundwater chemistry displayed the above response regularity in ZK3-ZK6 longitudinal section, while ZK1 groundwater chemical indicators tended to become the background value before the contamination incident under the condition of recharge and update of upstream fresh water. |
| ZHENG Zhao-xian,SU Xiao-si,WANG Nai,KANG Bo.2014.Groundwater Chemistry Response Regularity of Natural Biodegradation of Chloralkane Solvents in Shallow Groundwater[J].Acta Geoscientica Sinica,35(2):230-238. |
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