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Dissertations / Theses on the topic 'Air sparging'

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Published: 4 June 2021
Last updated: 27 February 2023

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1

Cheng, Zhao 1969. "Flow problems in air venting and air sparging." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9593.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.<br>Includes bibliographical references.<br>Soil Vapor Extraction (SVE) and Air Sparging have been used for site remediation for about ten years, but most of the past designs are based on experiences and numerical models. Understanding toward the physical problems is far from complete, and some simplified assumptions used in those models may not be true. In this thesis, we focus our attention on the hydrodynamic problems in SVE and air sparging. In Chapter One some basic concepts related t
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2

Hobert, Andrew Reid. "Development of a Novel Air Sparging Device." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/71828.

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Column flotation is commonly employed in the processing and recovery of fine mineral particles due to an increase in flotation selectivity unattainable using conventional flotation methods. Such an increase in selectivity is due to the employment of wash water, minimizing hydraulic entrainment of fine gangue particles, and the presence of quiescent operating conditions assisted by the use of various air sparging technologies. High performance air spargers increase the probability of collision and attachment between air bubbles and particles, thereby improving recovery of fine and coarse minera
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3

Paonessa, Michael E. (Michael Edward) 1979. "A model for predicting air flow during in-situ air sparging." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/85753.

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4

Han, Ji-seok. "The role of colloidal particles on the migration of air bubbles in porous media." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2471.

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5

Khadem, Md Nesar. "Flux optimization in passive membrane systems with air sparging and relaxation." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57296.

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Traditional membrane filtration plants for drinking water require uninterrupted electricity for pumps and fouling control, thus making it unsuitable for small/rural communities and developing countries. Gravity driven passive membrane filtration systems can be a possible solution to this problem. Previous studies demonstrated that frequent air sparging is beneficial to maintaining a high permeate flux in passive membrane systems. Previous studies also reported that forward flushing after relaxation is also beneficial to maintaining a high permeate flux. Air sparging is an alternate solution to
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6

Waduge, Waduge Anil Prasanna. "Physical and numerical modelling of source zone remediation by air sparging." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616062.

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7

Marulanda, Catalina 1971. "A study of air flow through saturated porous media and its applications to in-situ air sparging." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8253.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.<br>Includes bibliographical references (v. 2, leaves 305-312).<br>The efficiency of an in situ air sparging system is controlled by the extent of contact between injected air and contaminated soil and pore fluid. Characterizing the mechanisms governing air propagation through saturated porous media is therefore critical to the design of an effective cleanup treatment. The objectives of this investigation were thus to identify and to quantify the parameters that affect the advancement of
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8

Jang, Wonyong. "Unsteady multiphase flow modeling of IN-SITU air sparging system in a variable saturated subsurface environment." Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-11172005-140745/.

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Thesis (Ph. D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2006.<br>Dr. Spyros Pavlostathis, Committee Member ; Dr. Mustafa M. Aral, Committee Chair ; Dr. Turgay Uzer, Committee Member ; Dr. Ching-Hua Huang, Committee Member ; Dr. Sotira Yiacoumi, Committee Member. Vita. Includes bibliographical references.
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9

Jang, Wonyong. "Unsteady Multiphase Flow Modeling of In-situ Air Sparging System in a Variably Saturated Subsurface Environment." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7517.

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In order to preserve groundwater resources from contamination by volatile organic compounds and to clean up sites contaminated with the compounds, we should understand fate and transport of contaminants in the subsurface systems and physicochemical processes involving remediation technologies. To enhance our understanding, numerical studies were performed on the following topics: (i) multiphase flow and contaminant transport in subsurface environments; (ii) biological transformations of contaminants; (iii) in-situ air sparging (IAS); and, thermal-enhanced venting (TEV). Among VOCs, trichloroet
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10

Lockwood, David F. (David Farias). "An analysis of a diffusive-flux-limited model for groundwater cleanup rate estimation using air sparging." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43436.

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11

Jones, Karen R. (Karen Renae). "An analysis of air sparging/soil vapor extraction systems emphasizing volatilization kinetics in JP-4 jet fuel." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/40164.

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12

Doughty, Cynthia. "NAPL Recovery Using CO2-Supersaturated Water Injection: Distribution of the CO2 Gas Phase." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/1221.

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Gas inFusion? is a novel remedial technology that dissolves CO<sub>2</sub> into water under pressure for NAPL recovery. As the supersaturated liquid flows through the porous medium gas evolution occurs in situ as the system returns to thermodynamic equilibrium. The evolution of gas bubbles leads to NAPL recovery by two mechanisms: 1) volatilization and 2) mobilization by the NAPL spreading in a film around the rising bubbles. Laboratory experiments by Li demonstrated that injecting the supersaturated water into a porous medium minimized the buoyancy driven flow of gas and the fingering
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13

李海龍 and Hailong Li. "Tide-induced periodic groundwater and air flows in coastal aquifer systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31244452.

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14

Scussiato, Talita. "Estudo do fluxo de ar em solos usando a técnica de injeção de ar em modelos físicos bidimensionais." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3145/tde-11062013-105342/.

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O método de injeção de ar é utilizado para a descontaminação de solos e lençóis freáticos contaminados com Compostos Orgânicos Voláteis (VOCs). O ar injetado no solo na zona saturada, ao subir para a zona não saturada, volatiliza os contaminantes. A eficiência da remediação por esse método está diretamente ligada à região de solo em que ocorre o fluxo de ar. Essa região é denominada de zona de influência e é afetada por vários fatores tais como: tipo e estrutura do solo, permeabilidade e pressão de injeção. No presente trabalho foram realizados estudos de fluxo de ar em solos saturados em um m
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15

Jousse, Florie. "Processus physico-chimiques à l'origine des différences d'efficacité des techniques de traitement de sols pollués aux hydrocarbures." Thesis, Bordeaux 3, 2016. http://www.theses.fr/2016BOR30030/document.

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De nos jours, la préservation de l’environnement est un enjeu majeur. Avant cette prise de conscience, de nombreux polluants ont été rejetés dans la nature. Parmi eux, les hydrocarbures sont très souvent rencontrés. Or, ils sont reconnus pour leur toxicité et leur persistance accrue. La mise en place de méthodes efficaces de dépollution est donc primordiale. Les méthodes classiques nécessitent l’excavation ou le pompage des zones contaminées, imposant un coût de dépollution élevé. C’est pourquoi des techniques de dépollution in-situ ont été développées afin de réduire ces coûts, tout en garant
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16

Wu, Han-Lin, and 吳翰林. "A Mathematical Model Study for Air Sparging." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/67611879635244548408.

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碩士<br>國立成功大學<br>資源工程學系碩博士班<br>96<br>In-situ air sparging is a widely used remedial technique to remove volatile organic compounds (VOCs) from groundwater. Using toluene as an example, this study applied the air channel model to understand the toluene removal efficiency through in-situ sparging. The toluene removal efficiency increase as the air flow rate and the air saturation increase.
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17

Baker, Daniel M. "Physical modeling of in situ air sparging." 1996. http://catalog.hathitrust.org/api/volumes/oclc/36010224.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1996.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 146-149).
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18

Tsao, Shu-Ming, and 曹書銘. "Numerical Simulation of Air Sparging with TMVOC." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/73497458995895914224.

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碩士<br>國立交通大學<br>土木工程系所<br>102<br>The number of gas stations in Taiwan increased dramatically after the government lifted the ban on private ownership. However, the gas stations account for a large proportion of the soil and groundwater pollution sites. Leakage from storage tanks and pipelines accounts for the two major sources from which petroleum releases into the subsurface. Air sparging is one of the most commonly adopted in-situ remediation technology to clean up polluted groundwater in gas station sites. Its mechanism is to inject air into underground water where the dissolved constituent
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19

Wang, Liang-wei, and 王良偉. "Remediation of BTEX Contaminated Site by Air Sparging." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/30719116200846682648.

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碩士<br>國立中山大學<br>環境工程研究所<br>92<br>In this field-scale study, air sparging (AS) system was applied at a petroleum-hydrocarbon spill site to remediate contaminated soil and groundwater in situ. The objective of this study was to evaluate the effectiveness of the AS system on volatile organic compounds (VOC) removal via the volatilization mechanism. Moreover, the AS system would also enhance the in situ bioremediation process due to the increased oxygen concentration in the subsurface. Results from the preliminary site characterization show that high concentrations of benzene and toluene were pres
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20

Elder, Carl R. "Modeling mass transfer during in situ air sparging." 1997. http://catalog.hathitrust.org/api/volumes/oclc/50193159.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1997.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 135-138).
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21

Li, Lan. "Ultrafiltration Fouling: Impact of Backwash Frequency and Air Sparging." Thesis, 2014. http://hdl.handle.net/1807/65576.

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A bench-scale study was performed to optimize backwash frequency and air sparging conditions during ultrafiltration (UF) of natural surface waters in order to maximize water production and minimize irreversible fouling as well as operating and maintenance costs. Surface shear stress representing different air sparging conditions (continuous coarse bubble, discontinuous coarse bubble, and large pulse bubble sparging) was applied in combination with various backwash frequencies (0.5, 2 and 6 h) and fouling was assessed. Results indicated that air sparging with discontinuous coarse bubbles or lar
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22

Tsai, Yih-Jin, and 蔡易縉. "AIR SPARGING TRACER TEST TO INVESTIGATE THE FLOW PATH." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/24436570458909694327.

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博士<br>國立成功大學<br>資源工程研究所<br>89<br>Air sparging is frequently used for groundwater remediation. The efficiency of field remediation is greatly dependent on the flow path and radius of influence of the injected air. The thesis presents a useful method for investigating the flow path of the injected air, estimating the radius of influence, and assisting the design of well spacing of sparging wells. The method applies both tracer and modeling approach. A field test using helium as a tracer was conducted on an air sparging pilot. A 3-dimensional, 3-phase compositional model was utilized to simulate
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23

Huang, Mei-Chuan, and 黃美娟. "The Study of Air Flow in Saturated Porous Media under Air Sparging Condition." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/55758657966313259527.

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碩士<br>中國醫藥學院<br>環境醫學研究所<br>88<br>Accident releases of volatile organic compounds (VOCs) from petroleum products and solvents have resulted in gross contamination of soils and groundwater. VOCs are found to be non-aqueous phase liquids (NAPLs) at many contaminated sites. Air sparging, also called “in situ air stripping”, is a remedial technology whereby contaminant-free air is induced into a contaminated aquifer to volatilize VOCs from the groundwater into the air phase. Several field-scale applications of the air sparging system have indicated that air sparging may be effective in remediating
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24

Ekstrom, Ingrid L. "Effects of air sparging on a geochemically heterogeneous groundwater system." 2003. http://catalog.hathitrust.org/api/volumes/oclc/52907210.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 2003.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 110-112).
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25

Liang, Hung-Sen, and 梁閎森. "Pilot study and mathematical modeling for in-situ cometabolic air sparging." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/34119289761391065428.

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博士<br>國立成功大學<br>資源工程學系碩博士班<br>96<br>Trichloroethylene (TCE) was widely used as a solvent in the second 50 years of the 20th century. Because of uniform disposal practices for spent solvents in the past, it has become a major groundwater contaminant in Taiwan. In-situ biological methods offer promise for restoring aquifer contaminated organics, including TCE. Aerobic cometabolism is a powerful biological process that microorganisms growing on primary substrate produce enzyme and fortuitously transform secondary substrate. The efficiency of in-situ bioremediation is commonly lower than t
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26

Yen, Po-Ying, and 顏伯穎. "Numerical Simulation for the Removal of NAPL Contamination by using Air Sparging Technology." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/46yjq4.

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碩士<br>國立成功大學<br>資源工程學系碩博士班<br>90<br>Air Sparging is an innovative remediation technique that utlize volatization and degradation to remediate petroleum spills problems. This paper mainly uses T2VOC code to simulate Air Sparging and Soil Vapor Extraction(AS/SVE) technique for the removal of NAPLs Contamination and discuss its results. The reason of using numerical simulation is the mechanism of Air Sparging can’t be well-predicted by closed-form equations. 　　In the process of simulations, the results show when the saturated hydraulic conductivity of the aquifer is too small, such as clay layers
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27

Wu, Shiau-Feng, and 吳効峰. "Effects of air-sparging on particle deposition and filtration flux in cross-flow microfiltration." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/83200748696282334187.

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碩士<br>淡江大學<br>化學工程與材料工程學系碩士班<br>96<br>The effects of filtration flux、adhesion probability、cake properties and shear stress by changing liquid velocities、gas velocities and filtration pressures for air-sparging cross-flow microfiltration are studied. A filter membrane made of mixed cellulose ester with a mean pore size of 0.1 μm is used for filtering wide size distribution range particles, PMMA-7G. The flow behavior will change when gas velocity increases. Shear stress can restrain cake mass availability and improve filtration rates under bubble flow, but specific filtration resistance will inc
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28

Brunsting, Joseph Henry. "A Laboratory-Scale Investigation of In Situ Treatment of Arsenic-Contaminated Groundwater by Air Sparging." Thesis, 2012. http://hdl.handle.net/10214/4881.

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Arsenic contamination of groundwater is a major problem in some areas of the world, particularly in West Bengal (India) and Bangladesh where it is caused by reducing conditions in the aquifer. In situ treatment, if it can be proven as operationally feasible, has the potential to capture some advantages over other treatment methods by being fairly simple, not using chemicals, and not necessitating disposal of arsenic-rich wastes. In situ treatment by injection of aerated water has seen limited application with moderate success. However, another possibility is to employ in situ treatment by inje
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29

CHIEH, LU SHINN, and 呂信傑. "Numerical Simulation of Air Sparging and Soil Vapor Extraction for Remediation of Volatile Organic Contaminants." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/90205991924223870362.

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碩士<br>國立臺灣大學<br>環境工程學研究所<br>91<br>ABSTRACT Air Sparging coupled with Soil Vapor Extraction system(AS/SVE) has been widely applied for in-situ remediation in the United States. But the current definition of radius of influence(ROI) still could not reflect the distance at which contaminant removal occured. Although the radius of influence was defined by many studies, its application for in-situ remediation was still lacked. To understand the efficiency of radius of influence, a series of simulation were done to relate the ROI、parameters of operation and the efficiency of AS/SVE system
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30

Lambert, Jennifer. "Pulsed Biosparging of the E10 Gasoline Source in the Borden Aquifer." Thesis, 2008. http://hdl.handle.net/10012/4106.

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Air sparging is a technique used to remediate gasoline contamination. In sparging, air is injected below the target zone and removes contamination via two separate mechanisms; volatilization and biodegradation. In volatilization, the air contacts the contamination as it moves upward. The contaminant will partition to the vapor phase based on its volatility and will be removed as the air reaches the atmosphere. For biodegradation, the oxygen in the airstream is used for microbial activity. Pulsed air sparging, otherwise known as pulsed biosparging, has been found to be more effective than conti
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31

Tung, Ke-Hsien, and 童科憲. "A new method for air sparging on remediation of organic contaminants by adding alcohols into the groundwater." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/12044868644082657307.

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碩士<br>中原大學<br>生物環境工程研究所<br>104<br>Air sparging (AS) and soil vapor extraction (SVE) are frequently used to remediate contaminated soil and groundwater by organic compounds. When the target contaminants are low volatile organic compounds, it will be a very long schedule to finish the remediation. In this study, a novel method was presented to increase emissions of organic compounds and improve the remediation schedule for removal efficiencies of organic contaminants. The objective of this study is to add alcohol to groundwater for the increase in volatilization of organic compounds in the proce
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