Toluene degradation by a water/silicone oil mixture for the design of Two Phase Partitioning Bioreactors

Guillerm, Maxime; Couvert, Annabelle; Amrane, Abdeltif; Norrant, Edith; Breton, Audrey; Dumont, Éric

doi:10.1016/j.cjche.2017.01.010

Cited by 11 publications

(2 citation statements)

References 40 publications

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“…Water or aqueous solutions using bases, acids or oxidizing reagents are the most commons absorbent, restricting the use of this process to water-soluble VOCs. In the case of hydrophobic VOCs (e.g., aromatic and aliphatic hydrocarbons), various absorbents are available including silicone oils (Guillerm et al 2016(Guillerm et al , 2017 or poly(ethyleneglycol) (Vuong et al 2009). Unfortunately, many disadvantages are linked to the use of these solvents such as high cost, energy requirement for regenerating absorbents, losses, solvent degradation or equipment corrosion.…”

Section: Introductionmentioning

confidence: 99%

Air pollution: new bio-based ionic liquids absorb both hydrophobic and hydrophilic volatile organic compounds with high efficiency

Fahri¹,

Bacha²,

Chiki³

et al. 2020

Environ Chem Lett

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Emission of volatile organic compounds (VOCs) in the atmosphere is a major health concern for the World Health Organization (WHO). For instance, more than 4 million premature deaths are attributed yearly to outdoor air pollution, thus calling for advanced remediation techniques. Absorption systems using solvents are commonly used to remove air pollutants, yet efficiency is limited by a solvent property, which is either hydrophilic or hydrophobic. As a consequence, classical solvents are not able to capture both hydrophilic and hydrophobic contaminants. Therefore, we synthesized the following ionic liquids from choline chloride and fatty acids: hexylcholinium levulinate, octylcholinium levulinate, hexylcholinium lactate and octylcholinium lactate. Ionic liquids were then tested for absorption of toluene, dichloromethane (CH 2 Cl 2 ) and methyl ethyl ketone. Ionic liquids were characterized by 1 H and 13 C NMR, infrared spectroscopy, differential scanning calorimetry and thermal gravimetric analysis, density, viscosity and polarity. Vapor-liquid partition coefficients of VOC were determined for ionic liquids. We found that solvents were able to solubilize both hydrophobic and hydrophilic VOC. Moreover, no saturation was detected up to an initial VOC concentration of 3000 g/m 3 , whereas classical absorption processes usually involve gas streams containing VOC concentrations up to 1000 g/m 3 . Moreover, the solvent can be successfully recycled with unchanged capacity during five absorption-desorption cycles. Overall, our solvents appear promising for the treatment of industrial gaseous effluents.

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Section: Introductionmentioning

confidence: 99%

Air pollution: new bio-based ionic liquids absorb both hydrophobic and hydrophilic volatile organic compounds with high efficiency

Fahri¹,

Bacha²,

Chiki³

et al. 2020

Environ Chem Lett

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“…The selection of a NAP must satisfy several criteria [5]. Among the liquid phases tested (e.g., lubricant [6], vegetal oils [6,7], alkanes [8,9], ionic liquids [10]), silicone oils (i.e., PolyDiMethylSiloxane, PDMS) are the most adapted NAP to be implemented in a TPPB (mainly due to their low volatility and viscosity, high affinity for VOC, compatibility with biomass, and no bioavailability) [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Removal of a Mixture of Seven Volatile Organic Compounds (VOCs) Using an Industrial Pilot-Scale Process Combining Absorption in Silicone Oil and Biological Regeneration in a Two-Phase Partitioning Bioreactor (TPPB)

et al. 2022

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The treatment of a synthetic polluted gas containing seven volatile organic compounds (VOCs) was studied using a pilot plant in real industrial conditions. The process combined VOC absorption in silicone oil (PolyDiMethylSiloxane, i.e., PDMS), a biological regeneration of the PDMS in a two-phase partitioning bioreactor (TPPB), and a phase separation including settling and centrifugation. The TPPB was operated at a water/PDMS volume ratio of 75/25. The VOCs treatment performance was efficient during the entire test, corresponding to 10 PDMS regeneration cycles. The analysis of the content of the aqueous phase and PDMS confirmed that VOCs are progressively degraded until mineralization. The nitrogen consumption and the characterization of the microorganisms highlighted possible anoxic functioning of the biomass within the first decanter. Moreover, although the absorption and biodegradation performances were very satisfactory, the separation of all phases, essential for the PDMS recycling, was problematic due to the production of biosurfactants by the microorganisms, leading to the formation of a stable emulsion and foaming episodes. As a consequence, the packed column showed slight fouling. However, no significant increase in the pressure drop of the packed bed, as well as no significant impact on VOC absorption efficiency was observed.

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Indoor formaldehyde removal by catalytic oxidation, adsorption and nanofibrous membranes: a review

Nallathambi

2021

Environ Chem Lett

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Toluene degradation by a water/silicone oil mixture for the design of Two Phase Partitioning Bioreactors

Abstract: The liquid phase consisted of 75 % water and 25 % silicone oil (PDMS 50) -Biodegradation rates reached 104 g m -3 h -1 for 100 % toluene removal efficiency -A TPPB for toluene removal can therefore be designed for large-scale applications

Cited by 11 publications

References 40 publications

Air pollution: new bio-based ionic liquids absorb both hydrophobic and hydrophilic volatile organic compounds with high efficiency

Air pollution: new bio-based ionic liquids absorb both hydrophobic and hydrophilic volatile organic compounds with high efficiency

Removal of a Mixture of Seven Volatile Organic Compounds (VOCs) Using an Industrial Pilot-Scale Process Combining Absorption in Silicone Oil and Biological Regeneration in a Two-Phase Partitioning Bioreactor (TPPB)

Indoor formaldehyde removal by catalytic oxidation, adsorption and nanofibrous membranes: a review

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