| 岩溶裂隙含水层中石油类有机物的自然衰减机制 |
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| 引用本文： | 郭永丽,章程,吴庆,全洗强.岩溶裂隙含水层中石油类有机物的自然衰减机制[J].地球科学,2021,46(6):2258-2266. |
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| 作者姓名： | 郭永丽 章程 吴庆 全洗强 |
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| 作者单位： | 自然资源部广西岩溶动力学重点实验室,中国地质科学院岩溶地质研究所,广西桂林,541004 |
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| 基金项目： | 国家自然科学基金项目41702277中国地质科学院基本科研业务费项目2020004对发展中国家科技援助项目KY201802009国家重点研发计划项目2020YFE0204700广西自然科学基金项目2018GXNSFDA050002 |
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| 摘 要： | 石油类有机物污染是地下水环境领域亟须解决的关键课题.本次研究耦合数值模拟和水文地球化学技术模拟岩溶裂隙含水层中石油类有机物的自然衰减过程并定量计算其自然衰减机制.基于BIOSCREEN模型的模拟计算可知，近30年对流、弥散、稀释等物理过程和生物降解过程对石油类有机物衰减贡献率的平均值分别为31.53%和68.47%，生物降解作用是岩溶裂隙含水层自然修复能力的主要机制.利用质量守恒定律分析水化学（HCO3-、NO3-）和同位素（δ15NNO3、δ18ONO3和δ13CDIC）之间的相关关系可知石油类有机物生物降解贡献地下水HCO3-的平均值为33.93%；石油类有机物生物降解消耗主要电子受体NO3-贡献地下水δ13CDIC的百分率为30.77%且其占总生物降解的90.69%.
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| 关 键 词： | 石油类有机物 自然衰减过程 模拟 定量计算 环境地质 |
| 收稿时间： | 2020-12-25 |
Natural Attenuation Mechanisms of Petroleum Hydrocarbons in a Fractured Karst Aquifer |
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| Guo Yongli,Zhang Cheng,Wu Qing,Quan Xiqiang.Natural Attenuation Mechanisms of Petroleum Hydrocarbons in a Fractured Karst Aquifer[J].Earth Science-Journal of China University of Geosciences,2021,46(6):2258-2266. |
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| Authors: | Guo Yongli Zhang Cheng Wu Qing Quan Xiqiang |
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| Abstract: | It is vital to prevent the pollution of petroleum hydrocarbons in the groundwater environment globally. In the paper it uses numerical simulation method and hydrogeochemical techniques to simulate the natural attenuation processes of petroleum hydrocarbons in the fractured aquifer and calculate the natural attenuation mechanisms quantitatively. BIOSCREEN model was used to simulate the natural attenuation processes of petroleum hydrocarbons, the contribution rates of physical processes and biodegradation processes to the total natural attenuation are 31.53% and 68.47%, respectively, and biodegradation was the main mechanism for the natural remediation ability of fractured karst aquifer. Inter-relationships between water chemistries (HCO3-, NO3-) and isotopes (δ15NNO3, δ18ONO3 and δ13CDIC) were analyzed by the principle of quality conservation in the research. The average contribution rate of biodegradation to the concentration of HCO3- in the groundwater system was 33.93%. Ion of NO3- was the main electron acceptor in the anaerobic biodegradation processes of petroleum hydrocarbons without methanogenic activity. The process of petroleum hydrocarbon biodegradation consuming NO3- contributes 30.77% to the δ13CDIC in the groundwater system, which accounts for 90.69% of total biodegradation of petroleum hydrocarbons in the fractured karst aquifer. |
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