Improvement of a wind-tunnel sampling system for odour and VOCs

Wang, X.; Jiang, Jianming; Kaye, R.

doi:10.2166/wst.2001.0511

Cited by 19 publications

(8 citation statements)

References 8 publications

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“…The work of Wang et al (2001) [10] about a wind-tunnel sampling system guided the development of this chamber. It is a wood box roofed by Tedlar® sheet ( This chamber is placed along one side of the pile with the outlet at the top.…”

Section: Emission Chamber and Instrumentationmentioning

confidence: 99%

Monitoring the exhaust air of a compost pile as a process variable with an e-nose

Romain

Godefroid

Kuske

et al. 2005

Sensors and Actuators B: Chemical

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In this paper, the monitoring of the composting process with an e-nose is presented. An emission chamber is developed for this purpose and put on a household waste compost pile. A lab-made e-nose with metal oxide sensors is located at the exit of this chamber. Simultaneously to the e-nose measurements, air sampling on sorbent tubes as well as physico-chemical analysis are realised. The adsorbed air samples are analysed in the lab by gas chromatography coupled to mass spectrometry (GC-MS). In addition, some parameters of the composting process are collected (compost temperature, age of the pile, date of the aeration). Correlation between the sensors and 14 chemical families is determined by principal component analysis (PCA). By canonical analysis, two models are developed and calibrated by the proportion of each chemical family and in function of the compost process events. Thanks to these models, monitoring of various kinds of compost process events is possible with only one measurement device.

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Section: Emission Chamber and Instrumentationmentioning

confidence: 99%

Monitoring the exhaust air of a compost pile as a process variable with an e-nose

Romain

Godefroid

Kuske

et al. 2005

Sensors and Actuators B: Chemical

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“…Moreover emission rates measured with these devices are subject to external influences, including ambient wind speed and direction and the permeability of the emitting surface [72]. For improving the performance of these devices and optimizing efficiency parameters, special sampling chamber extension and a sampling manifold with optimally distributed sampling orifices have been developed for the wind-tunnel sampling system [74] and a suitable sampling system has been designed for the simulation of specific odour emission rates from liquid area sources without outward flow [75]. …”

Section: Sampling Methods For Odour Compoundsmentioning

confidence: 99%

Odour Detection Methods: Olfactometry and Chemical Sensors

Brattoli

Gennaro

Pinto

et al. 2011

Sensors

191

134

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The complexity of the odours issue arises from the sensory nature of smell. From the evolutionary point of view olfaction is one of the oldest senses, allowing for seeking food, recognizing danger or communication: human olfaction is a protective sense as it allows the detection of potential illnesses or infections by taking into account the odour pleasantness/unpleasantness. Odours are mixtures of light and small molecules that, coming in contact with various human sensory systems, also at very low concentrations in the inhaled air, are able to stimulate an anatomical response: the experienced perception is the odour. Odour assessment is a key point in some industrial production processes (i.e., food, beverages, etc.) and it is acquiring steady importance in unusual technological fields (i.e., indoor air quality); this issue mainly concerns the environmental impact of various industrial activities (i.e., tanneries, refineries, slaughterhouses, distilleries, civil and industrial wastewater treatment plants, landfills and composting plants) as sources of olfactory nuisances, the top air pollution complaint. Although the human olfactory system is still regarded as the most important and effective “analytical instrument” for odour evaluation, the demand for more objective analytical methods, along with the discovery of materials with chemo-electronic properties, has boosted the development of sensor-based machine olfaction potentially imitating the biological system. This review examines the state of the art of both human and instrumental sensing currently used for the detection of odours. The olfactometric techniques employing a panel of trained experts are discussed and the strong and weak points of odour assessment through human detection are highlighted. The main features and the working principles of modern electronic noses (E-Noses) are then described, focusing on their better performances for environmental analysis. Odour emission monitoring carried out through both the techniques is finally reviewed in order to show the complementary responses of human and instrumental sensing.

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“…The sample bottle was kept refrigerated before the emission test. It was used to collect emission samples as the leachate dam was not safely accessible for emission sampling using flux hood chamber [48] or portable wind tunnel [49] surface source sampling device.…”

Section: Leachate and Its Emission Samplingmentioning

confidence: 99%

Odorants and Their Contributions to Overall Odour Emission from a Landfill Leachate

Wang¹,

Sivret²,

Le³

et al. 2019

Preprint

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As one of the important odour sources, landfill sites have drawn more and more public attentions. Odour emissions from landfill sites depend on the waste buried, operation activities, running conditions, etc. A study for finding out all possible odorous compounds from a landfill was conducted by analysing of on-site gas phase samples and emission samples from a landfill leachate in Sydney, Australia using thermal desorber – gas chromatography – mass spectrometer (TD-GC-MS) and air server – thermal desorber – gas chromatography – sulfur chemiluminoscence detector (AS-TD-GC-SCD). 49 odorants were identified from emission gas samples collected from landfill leachate collection pipe and only 8 odorants were detected from flux hood emission samples of the collected leachate sample. This indicates that more sampling and measurement techniques are always better to acquire all possible pollutants from an unknown odour source. The contributions of these odorants to overall odour emissions were also calculated based on their concentrations and odour thresholds. The top 10 odorants from leachate transportation pipe include methyl mercaptan, ethyl mercaptan, m-xylene, H2S, CS2, 1,2,3,4-tetra-methylbenzene, p-xylene, 1,2,4-trimethylbenzene, ethylbenzene and α-pinene. They contributed more than 95% to the odour in the gas accumulated in the leachate collection pipe.

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Improvement of a wind-tunnel sampling system for odour and VOCs

Cited by 19 publications

References 8 publications

Monitoring the exhaust air of a compost pile as a process variable with an e-nose

Monitoring the exhaust air of a compost pile as a process variable with an e-nose

Odour Detection Methods: Olfactometry and Chemical Sensors

Odorants and Their Contributions to Overall Odour Emission from a Landfill Leachate

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