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定流量条件下壤土夹层对苯和Br-穿透包气带的影响
Effect of loam interlayer on benzene and Br- breakthrough vadose zone under constant flow
投稿时间:2017-03-14  修订日期:2017-09-25
DOI:10.12030/j.cjee.201703126
中文关键词:    吸附  运移  穿透  壤土夹层
英文关键词:benzene  adsorption  migration  breakthrough  loam interlayer
基金项目:成都理工大学地质灾害防治与地质环境保护国家重点实验室团队重点课题(SKLGP2011Z001)
作者单位
郭蕾蕾 1. 成都理工大学环境与土木工程学院, 成都 610059 
许模 1. 成都理工大学环境与土木工程学院, 成都 610059;2. 地质灾害防治与地质环境保护国家重点实验室, 成都 610059 
王璐 1. 成都理工大学环境与土木工程学院, 成都 610059 
李青山 1. 成都理工大学环境与土木工程学院, 成都 610059 
康小兵 1. 成都理工大学环境与土木工程学院, 成都 610059 
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中文摘要:
      为研究壤土夹层对VOCs穿透包气带的影响,以苯为特征污染物,NaBr为示踪剂开展室内的渗流模拟土柱实验。模拟包气带对苯的吸附实验,确定吸附平衡时间、最大吸附量,分析砂土和粉质壤土对苯的吸附特性;设计渗流土柱实验,模拟定流量降雨条件下苯在不同构型的土柱中的迁移过程,分析壤土夹层在时间和空间上对苯穿透包气带到达含水层的影响,并得出弥散系数和阻滞系数。结果表明,相对黏粒含量高的壤土夹层显著改变了溴离子的穿透曲线,对污染水有明显的阻水减渗作用,不仅延迟了苯向含水层的迁移时间,而且在一定程度上起到了吸附、降解的阻滞作用,有效降低了特征污染物穿透包气带的含量。
英文摘要:
      In order to study the effect of clay inter-layer on the benzene and Br- through the vadose zone, this paper takes the benzene as the characteristic pollutant and NaBr as the tracer to carry out the indoor seepage simulation soil column test. The adsorption experiments were carried out to determine the adsorption equilibrium time and the maximum adsorption capacity, and the adsorption characteristics of benzene in sandy soil and silty loam soil were analyzed. Seepage soil column experiment was designed, benzene migration process under simulated rainfall conditions in soil columns with different configurations was simulated. The influence of the clay inter-layer on the benzene and Br- through the vadose zone was analyzed. The dispersion coefficient and retardation coefficient were drawn. The results show that the relative high content of clay loam layer significantly changed the breakthrough curve of Br- and reduced infiltration of polluted water. It not only delayed the migration time of benzene to the aquifer, but also played the role of adsorption and degradation, which effectively reduced the content of the characteristic pollutant through the vadose zone.
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