Determining the effect of solid and liquid vectors on the gaseous interfacial area and oxygen transfer rates in two-phase partitioning bioreactors

Quijano, Guillermo; Rocha-Ríos, José; Hernández, Manuel Cruz; Villaverde, S.; Revah, Sergio; Muñoz, Raúl; Thalasso, F.

doi:10.1016/j.jhazmat.2009.10.020

Cited by 40 publications

(19 citation statements)

References 21 publications

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“…In turbulent reactors, for the organic phase addition to be effective, the increase in the different interfacial contact areas must overcome the general increase in the mass transfer resistance by the organic phase addition (Clarke and Correia 2008; Quijano et al 2010b). It has been shown in stirred tank reactors that silicone oil drops can increase the gas–water interfacial contact area through two effects, first, colliding with the gas bubbles and breaking them (Galindo et al 2000; Quijano et al 2010b), and second, by a reduction in the gas–water surface tension (Quijano et al 2010b).…”

Section: Bioreactor Configurations and Mass Transfer Enhancement Stramentioning

confidence: 99%

Review of mass transfer aspects for biological gas treatment

Kraakman

Rocha-Ríos

Loosdrecht

2011

Appl Microbiol Biotechnol

176

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This contribution reviews the mass transfer aspects of biotechnological processes for gas treatment, with an emphasis on the underlying principles and technical feasible methods for mass transfer enhancements. Understanding of the mass transfer behavior in bioreactors for gas treatment will result in improved reactor designs, reactor operation, and modeling tools, which are important to maximize efficiency and minimize costs. Various methods are discussed that show the potential for a more effective treatment of compounds with poor water solubility.

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Section: Bioreactor Configurations and Mass Transfer Enhancement Stramentioning

confidence: 99%

Review of mass transfer aspects for biological gas treatment

Kraakman

Rocha-Ríos

Loosdrecht

2011

Appl Microbiol Biotechnol

176

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“…The phenomena involved are complex and not well understood, as becomes clear from reviews by Clarke and Correia (2008) or Dumont and Delmas (2003). This is due, not only to the variety of mass transfer paths that may be involved between the three phases present (Dumont and Andrès, 2012;Dumont and Delmas, 2003;Rols et al, 1990), but also from the effect of oil addition on gas dispersion properties (bubble size, gas holdup, transfer area), which may indeed be seen as the major factor affecting the volumetric gas-liquid mass transfer coefficient, K L a, in stirred tanks (Correia et al, 2010;Quijano et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Gas Absorption in Stirred Gas-Liquid-Liquid Systems: Effect of Transferred Solute Solubility and Oil Phase Spreading Characteristics

Alves

Pinho

2013

Chemical Engineering Communications

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The effect on gas-liquid mass transfer of dispersing an oil phase in water in an aerated stirred tank is not predictable, because the mechanisms involved are not well understood. To try to elucidate these mechanisms, a set of experiments was carried out that included: (i) measurement of the effect of oil addition on gas dispersion properties, (ii) quantification of mass transfer of two solutes (heptane and oxygen) with very different solubilities in the liquid phases, and (iii) variation of the spreading characteristics of the oil phase, which consisted of mixtures of dodecane and heptane in varying concentrations. It was found that in the case of heptane mass transfer, when the oil spreading coefficient S changes from negative to positive, the outlet gas becomes practically saturated, corresponding to a several-fold increase in mass transfer coefficient. In the case of oxygen mass transfer, the effect of S is not as dramatic, but it is also quite significant. For a spreading oil phase (S > 0), the mass transfer coefficient decreases upon trace oil addition, going through a minimum as oil holdup increases, and then increasing steadily. In the case of a non-spreading oil phase, mass transfer coefficient initially increases with oil holdup increase, going through a maximum and then decreasing. Comparison between mass transfer coefficients for the two solutes indicates that k L a for heptane is larger than that of oxygen by a margin not explainable through the difference in diffusivities, which is evidence for a difference in transfer paths=mechanisms. A physical interpretation compatible with these results is offered.

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“…The biomass is settled out in a clarifi er, which is then either disposed off as sludge or recycled back to the aeration basin. In attached growth structures (trickling fi lters, rotating biological contractors and upfl ow fi xed fi lm bioreactor), microbes are grown as biofi lms on a solid support matrix and the pollutants in the water are removed as they diffuse into the biofi lm (Quijano et al 2010 ;FRTR 2012 ). Solid support matrix has a larger surface area for microbial attachment which could serve as an absorptive medium such as activated carbon (having the ability to adsorb pollutants and slowly release them to the microbes for degradation) or plastic or ceramic packing or sand or gravel.…”

Section: Slurry-phase Bioremediation: Bioreactorsmentioning

confidence: 99%

Ex-Situ Remediation Technologies for Environmental Pollutants: A Critical Perspective

Kuppusamy

Thavamani

Megharaj

et al. 2016

Reviews of Environmental Contamination and Toxicology

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Pollution and the global health impacts from toxic environmental pollutants are presently of great concern. At present, more than 100 million people are at risk from exposure to a plethora of toxic organic and inorganic pollutants. This review is an exploration of the ex-situ technologies for cleaning-up the contaminated soil, groundwater and air emissions, highlighting their principles, advantages, deficiencies and the knowledge gaps. Challenges and strategies for removing different types of contaminants, mainly heavy metals and priority organic pollutants, are also described.

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Determining the effect of solid and liquid vectors on the gaseous interfacial area and oxygen transfer rates in two-phase partitioning bioreactors

Cited by 40 publications

References 21 publications

Review of mass transfer aspects for biological gas treatment

Review of mass transfer aspects for biological gas treatment

Gas Absorption in Stirred Gas-Liquid-Liquid Systems: Effect of Transferred Solute Solubility and Oil Phase Spreading Characteristics

Ex-Situ Remediation Technologies for Environmental Pollutants: A Critical Perspective

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