Biodegradation of airborne acetone/styrene mixtures in a bubble column reactor

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22320%2F17%3A43913186" target="_blank" >RIV/60461373:22320/17:43913186 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22330/17:43913186

Výsledek na webu

<a href="http://www.tandfonline.com/doi/full/10.1080/10934529.2017.1318629" target="_blank" >http://www.tandfonline.com/doi/full/10.1080/10934529.2017.1318629</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/10934529.2017.1318629" target="_blank" >10.1080/10934529.2017.1318629</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Biodegradation of airborne acetone/styrene mixtures in a bubble column reactor

Popis výsledku v původním jazyce

The ability of a bubble column reactor (BCR) to biodegrade a mixture of styrene and acetone vapors was evaluated to determine the limiting factors affecting the process efficiency, with a particular emphasis on the presence of degradation intermediates and oxygen levels. The results under varied substrate loadings and ratios were matched with the dissolved oxygen levels and kinetics of oxygen mass transfer, which was assessed by determination of kLa coefficients. A 1.5L laboratory scale BCR was operated under a constant air flow of 1.0 L.min-1, using a defined mixed microbial population as a biocatalyst. Maximum overall elimination capacities of 75.5, 66.0 and 45.8 gC.m-3.h-1 and maximum overall specific degradation rates of 0.197, 0.059 and 0.027 gC.gdw-1.h-1 for styrene/acetone 2:1, styrene-rich and acetone-rich mixtures, respectively, showing significant substrate interactions and microbiological processes being rate limiting. The BCR removed both acetone and styrene near-quantitatively up to a relatively high organic load of 50 g.m-3.h-1. From this point, the removal efficiencies declined under increasing loading, accompanied with a significant drop in the dissolved oxygen concentration showing a process transition to oxygen-limited conditions. However, the relatively efficient pollutant removal from air continued, due to significant oxygen mass transfer, up to a threshold loading when the accumulation of acetone and degradation intermediates in the aqueous medium became significant. These observations demonstrate that oxygen availability is the limiting factor for efficient pollutant degradation and that accumulation of intermediates may serve as an indicator of oxygen limitation. Microbial (activated sludge) analyses revealed the presence of amoebae and active nematodes that were not affected by variations in operational conditions.

Název v anglickém jazyce

Biodegradation of airborne acetone/styrene mixtures in a bubble column reactor

Popis výsledku anglicky

The ability of a bubble column reactor (BCR) to biodegrade a mixture of styrene and acetone vapors was evaluated to determine the limiting factors affecting the process efficiency, with a particular emphasis on the presence of degradation intermediates and oxygen levels. The results under varied substrate loadings and ratios were matched with the dissolved oxygen levels and kinetics of oxygen mass transfer, which was assessed by determination of kLa coefficients. A 1.5L laboratory scale BCR was operated under a constant air flow of 1.0 L.min-1, using a defined mixed microbial population as a biocatalyst. Maximum overall elimination capacities of 75.5, 66.0 and 45.8 gC.m-3.h-1 and maximum overall specific degradation rates of 0.197, 0.059 and 0.027 gC.gdw-1.h-1 for styrene/acetone 2:1, styrene-rich and acetone-rich mixtures, respectively, showing significant substrate interactions and microbiological processes being rate limiting. The BCR removed both acetone and styrene near-quantitatively up to a relatively high organic load of 50 g.m-3.h-1. From this point, the removal efficiencies declined under increasing loading, accompanied with a significant drop in the dissolved oxygen concentration showing a process transition to oxygen-limited conditions. However, the relatively efficient pollutant removal from air continued, due to significant oxygen mass transfer, up to a threshold loading when the accumulation of acetone and degradation intermediates in the aqueous medium became significant. These observations demonstrate that oxygen availability is the limiting factor for efficient pollutant degradation and that accumulation of intermediates may serve as an indicator of oxygen limitation. Microbial (activated sludge) analyses revealed the presence of amoebae and active nematodes that were not affected by variations in operational conditions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20801 - Environmental biotechnology

Projekt

<a href="/cs/project/LH13073" target="_blank" >LH13073: Mechanismus mikrobiální degradace směsí toxických polutantů volnými a imobilizovanými buňkami v různých typech reaktorů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering

ISSN

1093-4529

e-ISSN

—

Svazek periodika

52

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

905-915

Kód UT WoS článku

000406758700011

EID výsledku v databázi Scopus

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