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Daugulis, Andrew J.; Boudreau, Neal G.

doi:10.1023/a:1025099427538

Cited by 61 publications

(5 citation statements)

References 9 publications

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“…Since their inception, TPPBs have been used in various designs to treat single substrate feeds of benzene ( 3 , 4 , 9 , 10 ), toluene ( , ), and ethylbenzene (), as well as a mixed feed of benzene and toluene (). The most recent research focused on demonstrating steady-state operation with a culture whose maintenance energy requirements consumed the entire substrate supply ().…”

Section: Introductionmentioning

confidence: 99%

Transient Performance of a Two-Phase Partitioning Bioscrubber Treating a Benzene-Contaminated Gas Stream

Nielsen

Daugulis

McLellan

2005

Environ. Sci. Technol.

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The dynamic performance of a prototype, two-phase partitioning bioscrubber in response to fluctuating benzene waste gas feeds has been characterized through a series of spike, step, and shutdown-restart experiments. From stable operation at a nominal loading capacity of 62 +/- 6 g/(m3 h) and removal efficiencies of over 99%, the bioscrubber was subjected to influent benzene concentration step changes and spikes as high as 10- and 20-fold, respectively. The bioscrubber responded rapidly and effectively to all feed concentration spikes and steps, as well as to step changes in the feed flow rate, maintaining nearly undisturbed performance. Although benzene absorption by the two liquid phases was found to dominate the early stages of each transient, Achromobacter xylosoxidans Y234 responded quickly to prolonged disturbances, readily consuming most of the excess absorbed substrate. The results demonstrate that the two-phase partitioning bioscrubber can rapidly acclimate to and recover from fluctuations, ensuring that stable performance can be maintained both during and aftertransients. The presence of n-hexadecane promotes benzene capture in the two-phase system by increasing the absorption driving force, an important characteristic during high intermittent loadings. Rapid recovery from two different shutdown scenarios further demonstrates the practical potential of the two-phase partitioning bioscrubber as a high-performance biotechnology alternative for the treatment of toxic waste gases.

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Section: Introductionmentioning

confidence: 99%

Transient Performance of a Two-Phase Partitioning Bioscrubber Treating a Benzene-Contaminated Gas Stream

Nielsen

Daugulis

McLellan

2005

Environ. Sci. Technol.

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“…; 92.4% for bacterium J2, 84.8% for bacterium J6 (39). However, the highest toluene metabolizing efficiencies (99 and 98%) have been reported so far for Rhodococcus erythropolis and Alcaligenes xylosoxidans respectively (40,41). The isolates with minimal toluene removal were found to be IUBT23 (28% ± 4.24) and IUBT26 (50% ± 9.19).…”

Section: Toluene Removal Efficiencymentioning

confidence: 84%

Characterization of Multi-Potential Toluene Metabolizing Bacteria Isolated from Tannery Effluents

Muccee

Ejaz

2020

Microbiology

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The focus of present study was to isolate and characterize bacteria which can be effectively used for toluene, a highly recalcitrant pollutant, bioremediation. For isolation of bacteria from the tannery effluents selective enrichment and serial dilution methods were employed. The isolated bacteria were subjected to growth curve analysis, estimation of toluene removal efficiencies, biochemical tests, antibiotic sensitivity assays and molecular characterization based upon 16S rRNA gene. The rRNA genes sequences were analyzed through BLAST to determine similarity index of isolates with bacterial database sequences. To trace the evolutionary history, phylogenetic trees were constructed using MEGA version 7. Total twenty toluene metabolizing bacteria (4)(5)(6)(7)(8)(9)(10)(11)(12)16,19,21,(23)(24)(25)(26) 28 and 30) were isolated and characterized. Their rRNA gene sequences have been submitted to Genbank. Fifteen of the twenty isolates showed homology to Brevibacillus agri strain NBRC 15538, four found similar to Bacillus paralicheniformis strain KJ-16 and one homologous to Burkholderia lata strain 383. All bacterial isolates were resistant to chloramphenicol but sensitive to teicoplanin and linezolid. However, few (i. e.; IUBT9 and 26) were sensitive to oxacillin. Biochemical characterization indicated all bacteria positive for alkaline phosphatases (100%). While many were found positive for p-nitrophenyl N-acetyl β, D-glucosaminidase (35%), hydroxyproline βnaphthylaminopeptidase (15%), esculinase (65%), mannitol (75%), sorbitol (95%) and inulin (90%) fermentation. Biochemical profile suggests the use of isolated bacteria for future exploitation in several fields like bioremediation of toluene, ethanol production, biomass hydrolysis, biosensors, biofertilizers, as a marker for milk pasteurization in dairy industries and evaluation of soil quality. ImportanceToluene is a highly toxic environmental pollutant. We have isolated bacteria which can be effectively used for the removal of toluene from environmental resources. Moreover, these bacteria are capable to produce many valuable enzymes which can be used in many industrial processes for the production of a wide range of products. Further study may help to exploit these bacterial for the benefit of humanity.

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“…For this reason, this work aims to separate previously these pollutant components with the intention of applying later specific processes to each component. Trying to avoid this kind of mass transfer limitations, several studies have proposed the use of multiphasic reactors or bioreactors, generally called two‐phase partitioning (bio)reactor (TPPR) 14, 15. This type of contactors involves the use of a second liquid phase which is nonaqueous and plays two different roles: (i) it increases the mass transfer rate of hydrophobic VOCs from gas to liquid phase, and (ii) it enhances the mass transfer from organic to aqueous phase due to a high driving force.…”

Section: Introductionmentioning

confidence: 99%

Beton‐ und Stahlbetonbau aktuell 10/2014

2014

Beton und Stahlbetonbau

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Cited by 61 publications

References 9 publications

Transient Performance of a Two-Phase Partitioning Bioscrubber Treating a Benzene-Contaminated Gas Stream

Transient Performance of a Two-Phase Partitioning Bioscrubber Treating a Benzene-Contaminated Gas Stream

Characterization of Multi-Potential Toluene Metabolizing Bacteria Isolated from Tannery Effluents

Beton‐ und Stahlbetonbau aktuell 10/2014

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