引用本文:张大定,谢云峰,柳晓娟,等.1,2-二氯乙烷自然衰减过程中模拟饱和含水层的氧化还原条件变化[J].环境科学研究,2012,25(12):1398-1403.
ZHANG Da-ding,XIE Yun-feng,LIU Xiao-juan,et al.Dynamics of Redox Environment during Natural Attenuation of 1,2-Dichloroethane in a Laboratory Aquifer Column[J].Reserrch of Environmental Science,2012,25(12):1398-1403.]
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1,2-二氯乙烷自然衰减过程中模拟饱和含水层的氧化还原条件变化
张大定1, 谢云峰1, 柳晓娟1, 孔祥斌1,2, 曹云者1, 李发生1
1.中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京100012;2.河北农业大学资源与环境科学学院, 河北 保定071001;1.中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京100012;2.河北农业大学资源与环境科学学院, 河北 保定071001
摘要:
为研究自然条件下饱和含水层中1,2-DCA(1,2-二氯乙烷)的自然衰减过程及该过程中含水层氧化还原环境的变化特征,利用室内连续水流土柱模拟饱和含水层,研究生物降解作用对1,2-DCA自然衰减的贡献以及饱和含水层环境条件的动态变化规律. 初始ρ(1,2-DCA)为50 mgL,模拟地下水流速为450 μLmin,模拟试验连续进行30 d,分别监测ρ(1,2-DCA)和水环境指标. 结果表明,1,2-DCA自然衰减的一级速率常数为0.068 9 d-1,其中生物降解作用的贡献率为6.34%. 1,2-DCA自然衰减过程中,NO3-首先充当生物降解的电子受体,随后Fe3+、SO42-依次发生反应,土柱内部不同高度出现了氧化还原分带,分别是硫酸盐还原带、铁盐还原带、硝酸盐还原带.
关键词:  1,2-二氯乙烷  含水层  自然衰减  电子受体  氧化还原
DOI:
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基金项目:国家环境保护公益性行业科研专项(201109017)
Dynamics of Redox Environment during Natural Attenuation of 1,2-Dichloroethane in a Laboratory Aquifer Column
ZHANG Da-ding1, XIE Yun-feng1, LIU Xiao-juan1, KONG Xiang-bin1,2, CAO Yun-zhe1, LI Fa-sheng1
1.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2.College of Resources and Environmental Sciences, Agriculture University of Hebei, Baoding 071001, China;1.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2.College of Resources and Environmental Sciences, Agriculture University of Hebei, Baoding 071001, China
Abstract:
Redox condition in saturated aquifers is one of the significant factors influencing natural attenuation of 1,2-Dichloroethane (1,2-DCA). In order to investigate the natural attenuation process of 1,2-DCA and its related redox environment variation in a saturated aquifer, a continuous-flow simulation column system was operated in the laboratory. The contribution of biodegradation and the dynamic variation of the redox conditions in the aquifer were studied. The initial concentration of 1,2-DCA was set to 50 mgL. The velocity of groundwater flow was simulated at a rate of 450 μLmin. A 30 day simulation was conducted, with samples taken every seven days to monitor variation of pollutant concentrations and various redox indicators in the aquifer. The results showed that the estimated first-order decay constant was 0.0689 d-1, and the contribution of biodegradation to natural attenuation was 6.34%. During the natural attenuation process, NO3- was first taken as the dominant electronic acceptor, followed by Fe3+ and SO42-. Sequential redox zones (sulfate-reducing zone, iron-reducing zone and nitrate-reducing zone, respectively) were observed in the aquifer columns at different distances from the water inlet.
Key words:  1,2-Dichloroethane  aquifer  natural attenuation  electronic acceptor  redox