Biofiltration of a styrene/acetone vapor mixture in two reactor types under conditions of styrene overloading

Zápotocký, Luboš; Halecky, Martin; Vaněk, Tomáš; Páca, Jan; Kozliak, Evguenii; Jones, Kim D.; Soccol, Carlos Ricardo

doi:10.1590/s1516-8913201402497

Cited by 7 publications

(11 citation statements)

References 20 publications

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“…[2,3] On the other hand, mass transfer of water-soluble substrates may be significantly improved in TBRs and other water-inundated reactors. Our previous studies confirmed different removal characteristics of individual pollutants in trickle-bed reactors and biofilters treating mixtures of hydrophobic and polar pollutants including styrene and acetone [1,4] as well as a paint solvents mixture. [2,5] Either BFs or TBRs were shown to be more efficient under specifically varied conditions, particularly for specific patterns of substrate loading.…”

Section: Introductionsupporting

confidence: 84%

“…The schematics of both of these individual reactor units were published elsewhere. [4] Both units were operated in a cocurrent air-liquid downflow mode. The same configuration, i.e., a height of 1.50 m and internal diameter of 0.15 m, was used for both reactors.…”

Section: Bioreactor Design and Operationmentioning

confidence: 99%

“…However, low overloading thresholds were observed in our prior work with both TBRs and BFs for treating styrene-acetone mixtures. [1,4] The hypothesis tested in this study was that the addition of a BF unit downstream to the TBR would increase the system's efficiency and stability. This effect was indeed observed and its cause was determined thus defining a novel reason for complementing a TBR with a downstream BF, to mitigate the acetone accumulation in the TBR aqueous medium.…”

Section: Introductionmentioning

confidence: 99%

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A two-stage combined trickle bed reactor/biofilter for treatment of styrene/acetone vapor mixtures

Vaněk

Halecky

Páca

et al. 2015

Journal of Environmental Science and Health, Part A

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Performance of a two-stage biofiltration system was investigated for removal of styrene-acetone mixtures. High steady-state acetone loadings (above C(in)(Ac) = 0.5 g.m(-3) corresponding to the loadings > 34.5 g.m(-3).h(-1)) resulted in a significant inhibition of the system's performance in both acetone and styrene removal. This inhibition was shown to result from the acetone accumulation within the upstream trickle-bed bioreactor (TBR) circulating mineral medium, which was observed by direct chromatographic measurements. Placing a biofilter (BF) downstream to this TBR overcomes the inhibition as long as the biofilter has a sufficient bed height. A different kind of inhibition of styrene biodegradation was observed within the biofilter at very high acetone loadings (above C(in)(Ac) = 1.1 g.m(-3) or 76 g.m(-3).h(-1) loading). In addition to steady-state measurements, dynamic tests confirmed that the reactor overloading can be readily overcome, once the accumulated acetone in the TBR fluids is degraded. No sizable metabolite accumulation in the medium was observed for either TBR or BF. Analyses of the biodegradation activities of microbial isolates from the biofilm corroborated the trends observed for the two-stage biofiltration system, particularly the occurrence of an inhibition threshold by excess acetone.

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Section: Introductionsupporting

confidence: 84%

Section: Bioreactor Design and Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A two-stage combined trickle bed reactor/biofilter for treatment of styrene/acetone vapor mixtures

Vaněk

Halecky

Páca

et al. 2015

Journal of Environmental Science and Health, Part A

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“…Variations in VOC concentration ratios often exhibit significant effects on biofilter performance when mixtures of either similar pollutants, e.g., gasoline and diesel vapors [1][2][3] , or very different components, such as styrene and acetone [4][5][6] and paint solvents [7][8][9] are treated. These effects as well as the frequently observed differences in performance of biofilters (BF) and trickle-bed bioreactors (TBR) are often ascribed to interactions of individual mixture components.…”

Section: Introductionmentioning

confidence: 99%

“…These effects as well as the frequently observed differences in performance of biofilters (BF) and trickle-bed bioreactors (TBR) are often ascribed to interactions of individual mixture components. [4,6] Biofiltration of two-component acetone-styrene mixtures in both BFs and TBRs presents a representative case study to investigate substrate interactions, which could as well be characteristic for multicomponent mixtures, e.g., paint solvents. Acetone (AC) and styrene (STY) significantly differ in both their biodegradability and mass transfer rates.…”

Section: Introductionmentioning

confidence: 99%

Effect of loading types on performance characteristics of a trickle-bed bioreactor and biofilter during styrene/acetone vapor biofiltration

Halecky

Páca

Kozliak

et al. 2016

Journal of Environmental Science and Health, Part A

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A 2:1 (w/w) mixture of styrene (STY) and acetone (AC) was subjected to lab-scale biofiltration under varied loading in both a trickle bed reactor (TBR) and biofilter (BF) to investigate substrate interactions and determine the limits of biofiltration efficiency of typical binary air pollutant mixtures containing both hydrophobic and polar components. A comparison of the STY/AC mixture degradation in the TBR and BF revealed higher pollutant removal efficiencies and degradation rates in the TBR, with the pollutant concentrations increasing up to the overloading limit. The maximum styrene degradation rates were 12 and 8 gc m(-3) h(-1) for the TBR and BF, respectively. However, the order of performance switched in favor of the BF when the loading was conducted by increasing air flow rate while keeping the inlet styrene concentration (Cin) constant in contrast to loading by increasing Cin. This switch may be due to a drastic difference in the effective surface area between these two reactors, so the biofilter becomes the reactor of choice when the rate-limiting step switches from biochemical processes to mass transfer by changing the loading mode. The presence of acetone in the mixture decreased the efficiency of styrene degradation and its degradation rate at high loadings. When the overloading was lifted by lowering the pollutant inlet concentrations, short-term back-stripping of both substrates in both reactors into the outlet air was observed, with a subsequent gradual recovery taking several hours and days in the BF and TBR, respectively. Removal of excess biomass from the TBR significantly improved the reactor performance. Identification of the cultivable strains, which was performed on Day 763 of continuous operation, showed the presence of 7 G(-) bacteria, 2 G(+) bacteria and 4 fungi. Flies and larvae of Lycoriella nigripes survived half a year of the biofilter operation by feeding on the biofilm resulting in the maintenance of a nearly constant pressure drop.

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Enhanced removal of hydrophobic volatile organic compounds in biofilters and biotrickling filters: A review on the use of surfactants and the addition of hydrophilic compounds

et al. 2021

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Biofiltration of a styrene/acetone vapor mixture in two reactor types under conditions of styrene overloading

Abstract: ABSTRACT

Cited by 7 publications

References 20 publications

A two-stage combined trickle bed reactor/biofilter for treatment of styrene/acetone vapor mixtures

A two-stage combined trickle bed reactor/biofilter for treatment of styrene/acetone vapor mixtures

Effect of loading types on performance characteristics of a trickle-bed bioreactor and biofilter during styrene/acetone vapor biofiltration

Enhanced removal of hydrophobic volatile organic compounds in biofilters and biotrickling filters: A review on the use of surfactants and the addition of hydrophilic compounds

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