Air stripping of organics from ground water

Harrison, Douglas P.; Valsaraj, Kalliat T.; Wetzel, David M.

doi:10.1016/0956-053x(93)90074-7

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…Harrison et al (1993) compared published Henry's constant data for these and other compounds and reported major differences. Errors in the values of H for a particular compound would propagate throughout the mass transfer coefficient analysis.…”

Section: Comparison With the Onda Correlationmentioning

confidence: 95%

“…The Onda correlation (Onda et al, 1968) for K 1 a was developed for countercurrent flow and has been recom-mended as the best correlation for air stripping applications (Staudinger, 1990). However, the reliability of the Onda correlation for less volatile compounds at conditions where the gas-phase resistance is important has been questioned (Roberts et al, 1985;Gossett et al, 1985;Harrison et al, 1993). Wood et al (1988) first modified the Onda correlation for the cascade crossflow stripper by basing the gas loading rate on the vertical flow area between opposite baffles instead of the horizontal packed cross-sectional area.…”

Section: Comparison With the Onda Correlationmentioning

confidence: 99%

“…The difference in the agreement between experimental and predicted mass transfer coefficients (using both the original and adjusted Onda parameters) for the three compounds may be the result of uncertainty in Henry's constant. Harrison et al (1993) compared published Henry's constant data for these and other compounds and reported major differences. Errors in the values of H for a particular compound would propagate throughout the mass transfer coefficient analysis.…”

Section: Comparison With the Onda Correlationmentioning

confidence: 99%

See 2 more Smart Citations

On the Performance of a Cascade Crossflow Air Stripping Column

Akiyama

Valsaraj

Wetzel

et al. 1996

Ind. Eng. Chem. Res.

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The cascade crossflow packed column is an innovative design that offers the separation advantages of countercurrent flow while avoiding flooding limitations. Liquid and gas crosssectional flow areas and path length in contact with packing may be controlled independently. These features are illustrated by studying the air stripping of methylene chloride (MeCl), 1,2-dichloroethane (1,2-DCA), and methyl ethyl ketone (MEK). Stripping efficiencies in the cascade crossflow column were generally slightly smaller than in countercurrent flow at equal liquid and gas flow rates. However larger gas-to-liquid ratios were possible in crossflow, permitting larger maximum stripping efficiencies to be attained. The experimental mass transfer coefficients were smaller than predicted by the Onda correlation. Modifications to the gas-phase Onda correlation are proposed that reduce the magnitude of the average deviation between experiment and prediction for 40 tests to about 12%. Experimental values of 38 of 40 tests were within (30% of modified Onda correlation predictions. Additional applications for the cascade crossflow concept are suggested, such as vacuum distillation columns and trickle-bed reactors, which require low pressure drop and/or large gas-to-liquid ratios.

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Section: Comparison With the Onda Correlationmentioning

confidence: 95%

Section: Comparison With the Onda Correlationmentioning

confidence: 99%

Section: Comparison With the Onda Correlationmentioning

confidence: 99%

See 1 more Smart Citation

On the Performance of a Cascade Crossflow Air Stripping Column

Akiyama

Valsaraj

Wetzel

et al. 1996

Ind. Eng. Chem. Res.

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“…Other destructive methods include thermal oxidation (Surinder et al 1992), bioreaction (Gomez et al 2009), catalytic oxidations (Peng et al 2003), sonochemical (Goel et al 2004, Yaqub andAjab 2013), electrochemical (Navaladian et al 2007), and nonthermal plasma (Hammer 1999, Vandenbroucke et al 2011, while the nondestructive method include air stripping (Harisson et al 1993), absorption (Zhu et al 2008), adsorption (Cho et al 2007), membrane-based separation (Garba 2008), and condensation (Dwivedi et al 2004).…”

Section: Introductionmentioning

confidence: 97%

Application of a packed column air stripper in the removal of volatile organic compounds from wastewater

Abdullahi

Hassan

Noor

et al. 2014

Reviews in Chemical Engineering

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Addressing environmental degradation and ensuring environmental sustainability are inextricably linked to all methods of reducing volatile organic compounds (VOCs) from the environment. A packed column air stripper is a typical example of such technologies for the removal of VOCs from polluted water. The present review is devoted to the applications of a packed column air stripper and, in comparison with previous reviews, presents further elaborations and new information on topics such as modeling and simulation of the dynamic behavior of the air stripping process in a packed column air stripper. The paper observed that a knowledge gap still exists in the synthesis of this knowledge to formulate practically applicable mathematical relationships to describe the process generally. Therefore, further researches are still required in the area of air stripper performance optimization, particularly in the development of a mathematical model and the optimization of an air stripper using a statistical experimental design method. Such a determination is critical to the understanding of the interactive effect of process variables such as temperature, air-to-water (A/W) ratio, and height of packing on air stripper performance.

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“…Following adsorption of contaminants, spent adsorbents such as activated granular carbon or synthetic resin often require further treatment, making this approach more complex than a simple single stage treatment. While air stripping is useful for the recovery of volatile organic compounds [1,2], some toxic organic species are removed neither by adsorption nor by air stripping because of either their low adsorbabilities or their low volatilities. This considerably reduces the effectiveness of both of these physical processes.…”

Section: Introductionmentioning

confidence: 99%

A practical photoelectrochemical cell using non precious metal electrodes

2010

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In this study a Photoelectrochemical Cell (PEC) constructed with inexpensive materials photodegraded selected organic compounds present in model waste waters, with the concomitant production of electrical current. Organic substrates dissolved in salt water included formic acid, 2-propanol, 1,2-dihydroxybenzene and ascorbic acid. Significant degradation of ascorbic acid was achieved when the cell was illuminated with a household 60 W tungsten light bulb, although better results were achieved with UV sources. Degradation of all the compounds was found to occur by zero order kinetics, and the PEC was shown not to work appreciably in dark conditions. Using a conventional light bulb, a formic acid PEC produced a power density of 19.1 ± 2 mW m -2 . When exposed to natural daylight, a power density of 31.5 ± 2 mW m -2 was achieved. There is considerable scope for scale up of this device for exterior use.

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Air stripping of organics from ground water

Cited by 8 publications

References 13 publications

On the Performance of a Cascade Crossflow Air Stripping Column

On the Performance of a Cascade Crossflow Air Stripping Column

Application of a packed column air stripper in the removal of volatile organic compounds from wastewater

A practical photoelectrochemical cell using non precious metal electrodes

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