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DOI	10.1061/(ASCE)EE.1943-7870.0001560
	Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments
	Gupta, Pankaj Kumar 1; Yadav, Basant 2; Yadav, Brijesh Kumar 1
通讯作者	Yadav, Brijesh Kumar
来源期刊	JOURNAL OF ENVIRONMENTAL ENGINEERING
ISSN	0733-9372
EISSN	1943-7870
出版年	2019
卷号	145 期号:9
英文摘要	The focus of this study was to investigate the fate and transport of toluene, a light nonaqueous-phase liquids (LNAPLs) in the subsurface region under dynamic groundwater table conditions. A series of experiments were conducted using two-dimensional (2D) sand tank setup having dimensions 125x90x10 cm (LxHxW) and integrated with an auxiliary column of inner diameter 14 cm and height 120 cm. Initially, a steady-state flow and LNAPL transport experiment was conducted under stable groundwater table condition. Thereafter, three groundwater table fluctuation experiments were conducted on a rising and falling groundwater table in 2, 4, and 8 h to maintain rapid, general, and slow fluctuation conditions, respectively. The pure phase of toluene was injected at a rate of 1 mL/min for a total duration of 5 min. Soil-water and soil-vapor samples were periodically collected and analyzed for toluene concentrations. Later, the representation of the 2D sand tank setup was numerically simulated to obtain the response of flow and the LNAPL transport under varying groundwater table conditions. Analysis of the results shows that a large LNAPL pool area (250 cm2) develops under rapidly fluctuating groundwater conditions, which significantly enhances the dissolution rate and contributes to a high concentration of dissolved LNAPLs at the receiving receptors. Estimated values of Sherwood and Peclet numbers show that the dissolution rates were highly affected by groundwater table dynamics, which may cause loss of pure-phase pollutant mass around the pollutant source. The concentration isolines of toluene show that the transport of dissolved LNAPL plumes was also comparatively fast in the case of rapidly fluctuating groundwater. A high biodegradation rate was observed in plume regions having concentration ranges of 140-160 ppm, while it decreases in plume regions having very high (>160 ppm) and low concentrations (<140 ppm) of dissolved LNAPL. In the sand tank, microbial growth was found to increase as the plume moved away from the LNAPL pool toward a low gradient, which intensifies the detrimental impact of toluene on the survival of indigenous microorganisms near the LNAPL pool. The results of this study may help in implementing effective remediation techniques to decontaminate LNAPL polluted sites under fluctuating groundwater table conditions, especially in (semi)-arid coastal aquifers. (c) 2019 American Society of Civil Engineers.
英文关键词	Light nonaqueous-phase liquids (LNAPL) Groundwater fluctuation Dissolution Biodegradation Two-dimensional (2D) tank experiments Numerical modeling
类型	Article
语种	英语
国家	India ; England
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000475465400007
WOS关键词	PHASE LIQUID DISSOLUTION ; INTERMEDIATE-SCALE EXPERIMENTS ; MASS-TRANSFER CORRELATIONS ; PETROLEUM HYDROCARBON ; POOL DISSOLUTION ; POROUS-MEDIA ; SYSTEMS ; FLOW ; NAPL ; BIODEGRADATION
WOS类目	Engineering, Environmental ; Engineering, Civil ; Environmental Sciences
WOS研究方向	Engineering ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216946
作者单位	1.Indian Inst Technol Roorkee, Dept Hydrol, Roorkee 247667, Uttarakhand, India; 2.Cranfield Univ, Rural Water Supply, Bedford MK43 0AL, England
推荐引用方式 GB/T 7714	Gupta, Pankaj Kumar,Yadav, Basant,Yadav, Brijesh Kumar. Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments[J],2019,145(9).
APA	Gupta, Pankaj Kumar,Yadav, Basant,&Yadav, Brijesh Kumar.(2019).Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments.JOURNAL OF ENVIRONMENTAL ENGINEERING,145(9).
MLA	Gupta, Pankaj Kumar,et al."Assessment of LNAPL in Subsurface under Fluctuating Groundwater Table Using 2D Sand Tank Experiments".JOURNAL OF ENVIRONMENTAL ENGINEERING 145.9(2019).