Bioscrubbing as a treatment for a complex mixture of volatile organic compounds: influence of the absorption column characteristics on performanceThis article is one of a selection of papers published in this Special Issue on Biological Air Treatment.

2009 ◽  
Vol 36 (12) ◽  
pp. 1926-1934 ◽  
Author(s):  
Luc Malhautier ◽  
Franck Lalanne ◽  
Jean-Louis Fanlo
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Removal Efficiency ◽  
Scale Up ◽  
Complex Mixture ◽  
Hydrodynamic Characteristics ◽  
Two Phase ◽  
Absorption Column ◽  
Oxygenated Compounds ◽  
Volatile Organic

A semi-industrial bioscrubber was developed to treat a complex mixture of volatile organic compounds (VOCs), including oxygenated, aromatic, and chlorinated compounds. Packed and atomizing columns were used for the bioscrubber. For an applied inlet load of around 850–870 g VOCs·m–3 packing material·h–1, the various performances of the bioscrubber were equivalent (around 50%), regardless of the selected absorption column. Only the removal efficiency of oxygenated compounds was found to be reasonable, close to 80%–85%. For the bioscrubber equipped with an atomizing column, a doubling of the inlet load involved a decrease in the removal efficiency of the VOC mixture (35%) and oxygenated compounds (from 80% to 55%). As the transferred compounds were biodegraded, the limits could be explained by the hydrodynamic characteristics of the atomizing column. Furthermore, these results demonstrate the necessity of optimizing the gas–liquid mass transfer step. Two-phase partitioning bioreactors seem to represent an attractive option, even though knowledge of the transfer of compounds and biodegradation mechanisms is required prior to scale-up and industrial use.

A New Real-Time Technique for Complex-mixture of Volatile Organic Compounds Monitoring

2013 ◽  
Vol 2013 (1) ◽  
pp. 3628
Author(s):  
Hao-Yu Lu ◽  
Shih-Wei Tsai ◽  
Shih-An Tsai ◽  
Chien-Lin Huang ◽  
Shih-Chi Chu ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Complex Mixture ◽  
Volatile Organic

scholarly journals Removal of volatile organic compounds using amphiphilic cyclodextrin-coated polypropylene

2014 ◽  
Vol 10 ◽  
pp. 2743-2750 ◽  
Author(s):  
Ludmilla Lumholdt ◽  
Sophie Fourmentin ◽  
Thorbjørn T Nielsen ◽  
Kim L Larsen
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Complex Mixture ◽  
Headspace Gas Chromatography ◽  
Cyclodextrin Derivatives ◽  
Model Compounds ◽  
Realistic Situation ◽  
Volatile Organic ◽  
Headspace Gas ◽  
Amphiphilic Cyclodextrin

Polypropylene nonwovens were functionalised using a self-assembled, amphiphilic cyclodextrin coating and the potential for water purification by removal of pollutants was studied. As benzene is one of the problematic compounds in the Water Framework Directive, six volatile organic compounds (benzene and five benzene-based substances) were chosen as model compounds. The compounds were tested as a mixture in order to provide a more realistic situation since the wastewater will be a complex mixture containing multiple pollutants. The volatile organic compounds are known to form stable inclusion complexes with cyclodextrins. Six different amphiphilic cyclodextrin derivatives were synthesised in order to elucidate whether or not the uptake abilities of the coating depend on the structure of the derivative. Headspace gas chromatography was used for quantification of the uptake exploiting the volatile nature of benzene and its derivatives. The capacity was shown to increase beyond the expected stoichiometries of guest–host complexes with ratios of up to 16:1.

Vacuum Ultraviolet Photoionization Mass Spectra and Cross-Sections for Volatile Organic Compounds at 10.5 eV

2007 ◽  
Vol 61 (8) ◽  
pp. 896-902 ◽  
Author(s):  
Nozomu Kanno ◽  
Kenichi Tonokura
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Cross Sections ◽  
Mass Spectra ◽  
Vacuum Ultraviolet ◽  
Single Photon ◽  
Photoionization Cross Section ◽  
Oxygenated Compounds ◽  
Flight Mass Spectrometry ◽  
Volatile Organic

Vacuum ultraviolet single-photon ionization time-of-flight mass spectrometry (VUV-SPI-TOFMS) has been applied to the detection of volatile organic compounds (VOCs), including aromatic, chlorinated, and oxygenated compounds. Photoionization mass spectra of 23 VOCs were measured using SPI-TOFMS at 10.5 eV (118 nm). The limits of detection of VOCs using SPI-TOFMS at 10.5 eV were estimated to be a few ppbv. The mass spectra of 20 VOCs exhibit only the parent ion and its isotopes' signals. The ionization processes of the VOCs were discussed on the basis of the reaction enthalpies predicted by the quantum chemical calculations. Absolute photoionization cross-sections for 23 VOCs, including 12 newly measured VOCs, at 10.5 eV were determined in comparison to the reported absolute photoionization cross-section of NO.

scholarly journals Fluxes and concentrations of volatile organic compounds above central London, UK

2009 ◽  
Vol 9 (4) ◽  
pp. 17297-17333 ◽  
Author(s):  
B. Langford ◽  
E. Nemitz ◽  
E. House ◽  
G. J. Phillips ◽  
D. Famulari ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Traffic Density ◽  
Mixing Ratios ◽  
Oxygenated Compounds ◽  
Volatile Organic ◽  
Benzene Toluene ◽  
The Uk

Abstract. Concentrations and fluxes of eight volatile organic compounds (VOCs) were measured during October 2006 from a high telecom tower above central London, as part of the CityFlux contribution to the REPARTEE I campaign. A continuous flow disjunct eddy covariance technique with analysis by proton transfer reaction mass spectrometry was used. Daily averaged VOC mixing ratios were within the range 1–19 ppb for the oxygenated compounds (methanol, acetaldehyde and acetone) and 0.2–1.3 ppb for the aromatics (benzene, toluene and ethylbenzene). Typical VOC fluxes were in the range 0.1–1.0 mg m−2 h−1. There was a non-linear relationship between VOC fluxes and traffic density for most of the measured compounds. Traffic activity was estimated to account for approximately 70% of the aromatic compound fluxes, whereas non-traffic related sources were found to be more important for methanol and isoprene fluxes. The measured fluxes were comparable to the estimates of the UK national atmospheric emission inventory for the aromatic VOCs and CO. In contrast, fluxes of the oxygenated compounds were about three times larger than inventory estimates. For isoprene and acetonitrile this difference was many times larger. At temperatures over 25°C it is estimated that more than half the isoprene observed in central London is of biogenic origin.

scholarly journals The impact of the agrochemical properties of soil on the chemical composition of Jerusalem artichoke flowers

2019 ◽  
Vol 26 (3) ◽  
Author(s):  
Ieva Stočkutė ◽  
Elvyra Jarienė
Keyword(s):  
Chemical Composition ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Complex Mixture ◽  
Jerusalem Artichoke ◽  
Quality Analysis ◽  
Volatile Organic ◽  
Ray Florets ◽  
The Impact ◽  
Different Parts

The objective of this research was to investigate and to evaluate the chemical composition of Jerusalem artichoke flowers grown in different soils. Quality analysis was carried out in the laboratories of the Institute of Agricultural and Food Science of Vytautas Magnus University. The following agrochemical parameters of the soil were determined using standardized methods: pHKCl, the amount of soil humus, mineral nitrogen, mobile phosphorus (P) and potassium (K). The chemical composition of different parts of Jerusalem artichoke flowers (disk florets and ray florets) were evaluated by the standard method: the content of carbohydrates (inulin and total saccharides content), minerals (N, P, K, Ca, Fe, Na, Zn, Mg). Electronic nose (Alpha M. O. S.) measurement technologies were used to recognize and identify the flower fragrance (volatile organic compounds). Processing of the research data was carried out through the application of the analysis of variance (ANOVA), using the computer software Statistica 10. The research results showed that the substantially highest amount of inulin was determined in the disk florets (0.339%, D. M.) of Jerusalem artichoke grown in the soil with the medium humus and medium available potassium amount. The content of total soluble saccharides of different parts of Jerusalem artichoke flowers varied from 2.54 to 4.11% of disk florets and from 0.55 to 0.81% of ray florets. The highest amount of macroelement potassium (3.1%, D. M.) was detected in Jerusalem artichoke flowers grown in the soil with the medium amount of humus and the medium amount of mobile potassium. Volatile organic compounds in Jerusalem artichoke flowers were determined as a complex mixture of esters, alcohols, terpenes, sulphur and other compounds. Esters as volatile compounds prevailed in Jerusalem artichoke flowers. Methyl acetate and ethyl 2-methylbutyrate with fruity, grape odour were the predominant esters group compounds as well as dimethyl trisulfide – sulfur compound in Jerusalem artichoke flowers. The investigated aroma profile of flowers shows that they have fruity-like odour.

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