Mass Balance Analysis of Ozone in Conventional Bubble Contactors

Roustan, M.; Duguet, J.P.; Brette, B.; Brodard, E.; Mallevialle, J.

doi:10.1080/01919518708552342

Cited by 22 publications

(15 citation statements)

References 3 publications

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“…An expression which relates e MZ to the gas and liquid flowrates and the resulting recirculation is given in Equation [12]:…”

Section: Determination Of K L a In The Mixing Zonementioning

confidence: 99%

“…Therefore combining Equations [12] and [13], the predicted gas holdup in the MZ can be calculated using Equation [14]:…”

Section: Determination Of K L a In The Mixing Zonementioning

confidence: 99%

“…Most of the studies performed have examined the ozone mass transfer process in conventional bubble diffusers. Roustan et al (1987) reported an increase in the overall volumetric mass transfer coefficient, k L a (s À1 ), with increasing superficial gas velocity in a conventional bubble contactor, with values up to 0.0015 s À1 . Lee et al (1999) studied ozonation in an impinging zone reactor and found k L a values in the range of 0.02-0.5 s À1 .…”

Section: Introductionmentioning

confidence: 96%

“…A number of studies (Hill and Spencer, 1973;Mallevialle et al, 1975;Tsuno et al, 1985;Roustan et al, 1987;Wright et al, 1998;Lee et al, 1999) have been conducted that investigated ozone mass transfer in different contacting devices. Most of the studies performed have examined the ozone mass transfer process in conventional bubble diffusers.…”

Section: Introductionmentioning

confidence: 97%

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Ozone Mass Transfer in the Mixing Zone of a Confined Plunging Liquid Jet Contactor

Jakubowski

Atkinson

Dennis

et al. 2006

Ozone: Science & Engineering

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In a Confined Plunging Liquid Jet Contactor (CPLJC) a jet of liquid is introduced into an enclosed cylindrical column (downcomer) that generates fine gas bubbles that are contacted with the bulk liquid flow. The region where the liquid jet impinges the receiving liquid and expands to the wall of the downcomer is called the Mixing Zone (MZ). In the MZ, the energy of the liquid jet is dissipated by the breakup of the entrained gas into fine bubbles, and the intense recirculation of the two-phase mixture. The study presented here was undertaken to quantify the ozone-water mass transfer performance of the MZ through the determination of the volumetric mass transfer coefficient, k L a (s À1 ), and to produce a model for predicting k L a based on the specific energy dissipation rate. It was found experimentally that k L a in the MZ increased with increasing superficial gas velocity. A maximum experimental k L a value of 0.84 s À1 was achieved which compares well to other contactors used in water treatment. Such a large k L a value combined with the small volume of the reactor, favorable energy requirements and safety features of the system, suggests that the CPLJC provides an attractive alternative to conventional ozone contactors. The relatively large mass transfer rates were found to be a function of the high gas holdup and fine bubble size generated in the MZ, which results in an almost froth-like consistency. A model based on the specific energy dissipation rate of the water jet, E (kg m À1 s À3 ), and MZ bubble size was used to predict k L a in the MZ. Using E, the number average bubble size was predicted which was then used to calculate the liquid phase mass transfer coefficient k L . The bubble size was also used with the predicted mixing zone gas holdup to calculate the specific interfacial area, a (m À1 ), which was then combined with k L to determine a predicted value of k L a. The average deviation between experimental and predicted k L a was 6.2%.

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“…An expression which relates e MZ to the gas and liquid flowrates and the resulting recirculation is given in Equation [12]:…”

Section: Determination Of K L a In The Mixing Zonementioning

confidence: 99%

“…Therefore combining Equations [12] and [13], the predicted gas holdup in the MZ can be calculated using Equation [14]:…”

Section: Determination Of K L a In The Mixing Zonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Ozone Mass Transfer in the Mixing Zone of a Confined Plunging Liquid Jet Contactor

Jakubowski

Atkinson

Dennis

et al. 2006

Ozone: Science & Engineering

View full text Add to dashboard Cite

show abstract

“…Many papers have been published dealing with this subject [1][2][3][4][5] as significant practical problems exist with most ozone experiments. Determining the ozone mass transfer rate into solution, the kinetics of ozone reaction and the actual amount of ozone consumed by the reaction under consideration are not simple tasks.…”

Section: Introductionmentioning

confidence: 99%