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首页> 外文学位 >Performance optimization of LNAPL three phases extraction by prefabricated vertical wells (PVWs).
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Performance optimization of LNAPL three phases extraction by prefabricated vertical wells (PVWs).

机译：预制垂直井（PVW）进行LNAPL三相萃取的性能优化。

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摘要

The use of petroleum products has sometimes been implemented with inadequate storage and disposal practices, which led to widespread contamination of the subsurface environment. Liquid petroleum products having a density less than water are referred to as Light Non Aqueous Phase Liquids (LNAPL), and are commonly found at the interface of unsaturated and saturated zones. LNAPL fluctuate with groundwater table and form a smear zone' occupied by ganglia. Remediation of these residual ganglia is extremely challenging even with today's advanced technology.;Research presented herein is focused on investigating the extraction of multiphase subsurface organic contamination using in situ approach termed Well Injection Depth Extraction (WIDE). The research encompasses field and modeling studies. The field study, performed at a former air force base in Ohio, included monitoring system performance, in terms of extracted liquid and gas phases, over 185 operating hours on 38 separate days. The modeling study consisted of three parts: (i) groundwater modeling, (ii) contaminant transport modeling, (iii) multiphase flow and transport modeling. The modeling study attempted to characterize phase transfer mechanism as a function of air permeability and suction head, study the mechanics involved with controlled lowering/raising of groundwater table through system optimization, and investigate effect of subsurface hydrogeologic parameters (permeability, porosity) on the ability to extract LNAPL source and the magnitude of the residual phases. Modeling results were also used in an optimization scheme to investigate schedules for lowering of groundwater table and extraction efficiency.;The results from this study document field data on system performance for extraction of LNAPLs in a subsurface with lenticular morphology. The field results were used to calibrate the models used in the analytical studies. Results from the analytical studies explained phenomena related to various phase extraction based on well spacing, and impact of subsurface parameters on residual LNAPL distribution and preferential phase for extraction. The optimization analyses provided a framework for establishing a process for systematic lowering of groundwater table to target residual phase with volatilization, and optimize well spacing for maximum removal of contaminant mass.
机译：有时使用不充分的存储和处置方法来实施石油产品的使用，这导致了地下环境的广泛污染。密度小于水的液体石油产品称为轻质非水相液体（LNAPL），通常在不饱和区和饱和区的界面处发现。 LNAPL随地下水位波动，并形成神经节占据的涂片区。即使使用当今的先进技术，对这些残留神经节的修复也极具挑战性。本文提出的研究重点在于研究使用称为井注深度提取（WIDE）的原位方法提取多相地下有机污染物的方法。该研究包括现场研究和建模研究。在俄亥俄州的一个前空军基地进行的现场研究包括在38个独立的工作日中，在超过185个工作小时内，监测系统在提取的液相和气相方面的性能。建模研究包括三个部分：（i）地下水建模，（ii）污染物迁移建模，（iii）多相流和迁移建模。该建模研究试图将相转移机制描述为透气性和吸力头的函数，通过系统优化研究与控制地下水位降低/升高有关的机理，并研究地下水文地质参数（渗透率，孔隙度）对能力的影响。提取LNAPL源和剩余相位的大小。建模结果也被用于优化方案中，以研究降低地下水位和提取效率的时间表。这项研究的结果记录了具有透镜状形态的地下LNAPL提取系统性能的现场数据。现场结果用于校准分析研究中使用的模型。分析研究的结果解释了与基于井距的各种相提取有关的现象，以及地下参数对残余LNAPL分布和优先提取相的影响。优化分析提供了一个框架，可用于建立一个系统性降低地下水位，以挥发为目标的残留相的过程，并优化井距以最大程度地去除污染物。

著录项

  • 作者

    Sharmin, Nadia.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Engineering Civil.;Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 269 p.
  • 总页数 269
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;环境污染及其防治;
  • 关键词

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