Fate and transport of ethanol-blended dissolved BTEX hydrocarbons: a quantitative tracing study of a sand tank experiment
Fate and transport of ethanol-blended dissolved BTEX hydrocarbons: a quantitative tracing study of a sand tank experiment
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乙醇混合溶解的 BTEX 碳氢化合物的归宿和迁移：沙罐实验的定量追踪研究
DOI：
10.1007/s12665-012-2102-4
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发表时间：
2013-09-01
影响因子：
2.8
通讯作者：
Liu, Hanle
中科院分区：
文献类型：
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作者：
Chen, Yudao;Jiang, Yaping;Liu, Hanle
为了评估乙醇混合溶解BTEX烃在地下水中的行为，在控制水力条件下，采用大型砂槽，将含溴化物、乙醇和溶解BTEX的2-L溶液注入其中，进行了定量示踪研究，而不是定性分析。测定了注入溶质的平均停留时间（MRT）、溶质扫过的孔隙体积（Vp）、阻滞系数(R)和生物降解速率常数(k)。与溴化物作为保守示踪剂相比，乙醇和BTEX具有较短的MRT和较小的vpp，其序列为EtOH < T < E <m/p-X <o-X < B < Br。通过溶解氧（DO）、硝酸盐和硫酸盐的消耗以及醋酸盐的产生，证实了生物降解。其中EtOH > T > E >m/p-X >o-X > B的序列与MRT和vp的序列正好相反。上述序列之间的关系表明，MRT和vpt可以作为评价溶质原位生物降解性的指标。反应性溶质的生物降解可使其MRT缩短，vpt缩小。此外，乙醇的吸附可以忽略（R= 1.0），而BTEX化合物被吸附（R= 1.04-1.15）。应该指出的是，溶质的生物降解会影响其延迟系数的估计。据我们所知，本文为定量估计地下水中溶质的生物降解性提供了一条可行的途径。
To estimate the behavior of ethanol-blended dissolved BTEX hydrocarbons in groundwater, a quantitative tracing study instead of qualitative analysis was carried out by using a large sand tank, into which 2-L solution including bromide, ethanol and dissolved BTEX was injected under a controlled hydraulic condition. Mean residence time (MRT), pore volume swept by solute (Vp), retardation coefficient (R) and biodegradation rate constant (k) of injected solutes were estimated. Compared with bromide that was used as a conservative tracer, ethanol and BTEX had shorter MRT and smallerVpwith the sequence of EtOH < T < E <m/p-X <o-X < B < Br. Biodegradation was confirmed as evidenced by the consumptions of dissolved oxygen (DO), nitrate and sulfate, and the production of acetate. The sequence ofkas EtOH > T > E >m/p-X >o-X > B was just opposite to the sequences of MRT andVp. The relationship among above sequences implies that MRT andVpcan be used as indicators to assess in situ biodegradability of a solute. Biodegradation of a reactive solute can make its MRT shortened andVpshrunk. In addition, the sorption of ethanol could be neglected (R= 1.0), whereas BTEX compounds were adsorbed (R= 1.04–1.15). It should be noted that biodegradation of a solute can affect the estimation of its retardation coefficient. To our knowledge, this paper provides an available route to quantitatively estimate biodegradability of a solute in groundwater.