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Performance modeling and optimization of contaminant extraction using prefabricated vertical wells (PVWs)

机译:使用预制垂直井(PVW)进行性能建模和污染物提取的优化

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摘要

Well injection depth extraction (WIDE) is a hybrid in situ subsurface remediationntechnology applicable for liquid and gas extraction in fine-grained soils. A finite element model isndeveloped to study the impact of the extraction process, using WIDE, on the groundwater headndistribution and contaminant transport. An optimization process is employed to develop an operatingnschedule to control groundwater elevations and therefore improve removal efficiency of a givenncontaminant phase. The model results showed that groundwater elevation was lowered at the rate ofnapproximately 30 mm/h at an extraction rate of 0.125 m3/h. The transport model is analyzed for threenscenarios: (1) applying a continuous source of benzene concentration to provide information on thenrequired time for mobilization of benzene due to the presence of a constant source at the top of thenwater table; (2) applying an initial pulse concentration of benzene at the top of the groundwater tablento show the reduction rate of soluble benzene concentration with time, once the liquid free product isnremoved, and the soluble phase is removed from within the sand seam but remains above it in thenlower-permeability layer; and (3) applying a uniform distribution of the soluble phase of benzenenwithin the geologic medium between the wells to investigate progressive contaminant removal from thenhydro-geologic domain, given that groundwater is contaminated with soluble phase. Effluentnconcentration equal to the initially assumed constant source of 0.3 mg/L of benzene leaking into an0.08 m thick sand lens was obtained after 18 h of system operation. On the other hand, once the sourcenceased to exist, and considering an initial pulse concentration of benzene on top of the groundwaternlevel, 125 h of continuous system operation was needed to lower the benzene concentration to lessnthan 0.005 mg/L (maximum concentration level for drinking water standards) within the flow domain.nResults from the optimization study showed that an operation schedule of 3 h ‘on’ and 21 h ‘off ’ cannenhance the efficiency of WIDE extraction of subsurface contaminants in various phases.
机译:井注深度提取(WIDE)是一种现场混合地下修复技术,适用于细粒土壤中的液体和气体提取。开发了一个有限元模型来研究使用WIDE提取过程对地下水水头分布和污染物迁移的影响。采用优化过程来制定控制时间表,以控制地下水水位,从而提高给定污染物相的去除效率。模型结果表明,抽取水量为0.125 m3 / h时,地下水高程以大约30 mm / h的速度降低。分析了三种情况下的迁移模型:(1)应用连续的苯浓度源,以提供关于由于在地下水位顶部存在恒定源而需要的苯动员时间的信息; (2)在地下水位的顶部施加初始脉冲浓度的苯,以显示可溶性苯浓度随时间的降低率,一旦去除了无液产物,并且可溶相从砂层内部去除但仍保持在其上方在较低的渗透层中(3)考虑到地下水被可溶性相污染,在井间的地质介质中采用苯的可溶性相的均匀分布,以研究从水文地质领域逐步去除污染物。系统运行18小时后,获得的废水浓度等于最初假定的恒定源0.3 mg / L的苯泄漏到0.08 m厚的沙透镜中。另一方面,一旦确定了来源,并考虑到地下水水位上方苯的初始脉冲浓度,则需要连续运行125小时以使苯浓度降至0.005 mg / L以下(饮用水的最大浓度水平)优化研究的结果表明,3小时“开”和21小时“关”的运行时间表可以提高WIDE在各个阶段提取地下污染物的效率。

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  • 来源
    《Geosynthetics International-issn》 |2008年第3期|p.205-215|共11页
  • 作者单位

    1Graduate Research Assistant, North Carolina State University, Raleigh, NC 27695-7908, USA,nTelephone: +1 919 515 7904, Telefax: +1 919 515 7908, E-mail:nnsharmi@ncsu.edun2Assistant Professor, U. A. Whitaker School of Engineering, Florida Gulf Coast University, Fort Myers, FLn33965-6565, USA, Telephone: +1 239 590 7644, Telefax: +1 239 590 7304, E-mail: tkunberg@fgcu.edun3Professor, North Carolina State University, Raleigh, NC 27695-7908, USA,nTelephone: +1 919 515 7904, Telefax: +1 919 515 7908, E-mail: gabr@eos.ncsu.edun4Associate Director, West Virginia Water Research Institute, National Research Center for Coal andnEnergy, West Virginia University, PO Box 6064, Morgantown, WV 26506-6064, USA,nTelephone: +1 304 293 2867, Telefax: +1 304 293 7822, E-mail: jdquaranta@mail.wvu.edu.aun5Professor, Department of Civil and Environmental Engineering, University of Missouri-Columbia,nColumbia, MO 65211-2200, USA, Telephone: +1 573 882 4784, Telefax.: +1 573 882 4784,nE-mail: Bowders@missouri.edu;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Geosynthetics; Well injection depth extraction (WIDE); Groundwater profile; Contaminant transport; Subsurface model; Optimization;

    机译:土工合成材料;井注入深度提取(WIDE);地下水剖面;污染物运输;地下模型;优化;

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