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Wang Huan Chen Yudao He Lewei Jiang Yaping Xia Yuan Yang Pengfei 《Hydrogeology Journal》2022,30(1):151-161
Hydrogeology Journal - Enhanced bioremediation combined with in-situ chemical oxidation has the potential to remediate groundwater contaminated with organics. To explore the remediating effects of... 相似文献
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岩溶含水系统遭受石油烃污染的环境问题十分普遍。相对于多孔含水介质,石油烃BTEX在石灰岩含水介质中的生
物可降解性还不确定。为此,本研究开展了BTEX在石灰石和岩溶地下水介质中的静态微元体实验。经过77天的实验检测
分析,结果表明：（1） BTEX化合物在可利用电子受体溶解氧或硝酸盐存在条件下具有生物可降解性;（2） 向系统中补充
电子受体硝酸盐,具有促进生物降解的作用,其对BTEX的去除率可高达94%;（3） 未发现补充硫酸盐能够促进BTEX生物
可降解性;（4） 甲苯和二甲苯容易被生物降解,但苯的去除具有一定的难度。 相似文献
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近年来,应用于修复石油烃污染地下水的监测自然衰减技术得到了广泛深入研究,同时质量通量方法已逐渐成为评
估地下水燃油污染场地自然衰减监测修复效能的重要手段。通过在室内砂槽中添加乙醇汽油组分,监测其自然衰减,利用
质量通量方法,得出了BTEX和乙醇的质量减少率、自然衰减速率常数K;结合非反应示踪剂溴离子,评价了BTEX和乙醇
自然衰减因素中吸附和微生物的联合降解效应。结果表明,自然衰减是地下水中燃油组分修复的重要机制,质量通量方法
是评估自然衰减的有效方法之一。BTEX和乙醇在自然衰减过程中被去除的比例分别为78.88%和98.71%,其中约98%的
BTEX 因吸附和生物降解联合作用被去除,接近100%的乙醇因内在生物降解作用被去除;BTEX 的自然衰减速率为
0.077d-1~0.167d-1,乙醇为0.353d-1,自然条件下乙醇比BTEX更容易衰减。 相似文献
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Characteristics of distribution and transport of petroleum contaminants in fracture-karst water in Zibo Area, Shandong Province, China 总被引：8，自引：0，他引：8
Fracture-karst water is an important water resource for the water supply in North China. Petroleum contamination is one of
the most problematic types of the groundwater pollution. The characteristics of distribution and transport of the petroleum
contaminants in fracture-karst water are different from those in porous water. The flow velocity of fracture-karst water is
much faster than the velocity of porous water on an average. Therefore, contaminant transport in fracture-karst water is an
absolute advection-dominated problem. The plume of the petroleum contamination may extend to several kilometers from pollution
sources. It was not caused by the oil pool floating on the water table but by the oil components dissolved and scattered in
groundwater. The distribution of the petroleum contaminants over space are concentrated in the strong conductive zone on the
plane. On the vertical section the highest concentration of the oil contaminants appeared in the strata where the contamination
sources were located. The concentrations of the oil contaminants in wells changed greatly over time. Therefore, the curves
of concentration versus time fluctuated greatly. The reasons are as follows. (a) Fracture-karst water has a very great velocity.
(b) Local flow fields which were caused by pumping and stoppage in some wells changed frequently. (c) In fracture-karst aquifer
the transport channels are complicated. (d) Residual oil in vadose zone was leached after rainfall. It is of great practical
value for the control and remediation of petroleum contamination in fracture-karst aquifer to understand those characteristics. 相似文献
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Fate and transport of ethanol-blended dissolved BTEX hydrocarbons: a quantitative tracing study of a sand tank experiment 总被引：2，自引：1，他引：1
Yudao Chen Yaping Jiang Yinian Zhu Yuan Xia Yaping Cheng Yuequn Huang Hanle Liu 《Environmental Earth Sciences》2013,70(1):49-56
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 (V p), 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 smaller V p with 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 of k as EtOH > T > E > m/p-X > o-X > B was just opposite to the sequences of MRT and V p. The relationship among above sequences implies that MRT and V p can be used as indicators to assess in situ biodegradability of a solute. Biodegradation of a reactive solute can make its MRT shortened and V p shrunk. 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. 相似文献
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汽油污染含水层中芳香烃的自然去除与生物降解特征 总被引：7，自引：0，他引：7
石油烃污染地下水是一个普遍而严重的环境问题.用砂卵石、中粗砂、细砂、粉砂和粘土等在实验室内按照自然界沉积物层序制作了一个含水层物理模型,具有给水、排水、监测、抽提、淋滤与注入等功能.利用该模型开展石油烃污染地下水的特征研究结果表明,苯、甲苯、乙苯和二甲苯(benzene,toluene,ethylbenzene,xylene;BTEX)各溶解组分能够被自然去除,其中甲苯自然衰减的速率系数为0.057 5～0.150 4 d-1,二甲苯为0.068 3～0.104 6 d,乙苯大约为0.047 8 d,苯为O.017 8～0.040 6 d.甲苯与二甲苯容易被去除,然而苯的去除则需要较长的时间.作为BTEX去除反应的电子受体,溶解氧、硝酸盐在需氧或厌氧条件下具有优先利用的机会,而硫酸盐则缺乏优先利用的机会.BTEX溶解组分浓度的降低,加上电子受体浓度的降低,可以表明含水层存在需氧条件与硝酸盐还原条件下的内在生物降解作用.其意义在于通过增加含水层中电子受体的浓度,将有助于内在生物降解能力的增强,从而能够提高含水层中污染物去除的效果. 相似文献
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淄博市大武水源地地下水流场演变及其影响因素 总被引：1，自引：0，他引：1
大武水源地是我国北方罕见的特大型地下水源地,其地下水源流场的演变与补给来源,排泄方式有密切的关系,而上游水库的放水则使这种关系变得不明朗。加强补给边界的水位监测,进一步研究补给边界的非自然影响是提高该区地下水资源评价,预测和管理精度的有效手段。 相似文献
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以漓江上游现有的青狮潭大型水库为依据,采用IHA和RVA方法分析了33个水文指标的变化程度,揭示水库调节对漓江生态环境的影响。结果表明:水库调节能够明显增加枯水期12月、1月和2月的月平均流量,增加值为4.5~12.3m3/s;可使得年最小1d流量与年最大1d流量间隔时间变宽,增加45d,但对年最小连续1d、3d和7d的极端水文条件改善不明显;高流量脉冲历时有所增加,低流量脉冲历时减小,日均流量平均增加率和减少率均减小;漓江水文情势整体改变度为中度。漓江水利工程调节既要满足旅游通航需要,也应重视极端枯水期的调节。 相似文献