On-line monitoring of methane in sewer air

Liu, Yiwen, Sharma, Keshab R., Murthy, Sudhir, Johnson, Ian, Evans, Ted and Yuan, Zhiguo (2014) On-line monitoring of methane in sewer air. Scientific Reports, 4 . doi:10.1038/srep06637


Author Liu, Yiwen
Sharma, Keshab R.
Murthy, Sudhir
Johnson, Ian
Evans, Ted
Yuan, Zhiguo
Title On-line monitoring of methane in sewer air
Journal name Scientific Reports   Check publisher's open access policy
ISSN 2045-2322
Publication date 2014-10
Year available 2014
Sub-type Article (original research)
DOI 10.1038/srep06637
Open Access Status DOI
Volume 4
Total pages 8
Place of publication London, United Kingdom
Publisher Nature Publishing Groups
Collection year 2015
Language eng
Formatted abstract
Methane is a highly potent greenhouse gas and contributes significantly to climate change. Recent studies have shown significant methane production in sewers. The studies conducted so far have relied on manual sampling followed by off-line laboratory-based chromatography analysis. These methods are labor-intensive when measuring methane emissions from a large number of sewers, and do not capture the dynamic variations in methane production. In this study, we investigated the suitability of infrared spectroscopy-based on-line methane sensors for measuring methane in humid and condensing sewer air.   Two such sensors were comprehensively tested in the laboratory. Both sensors displayed high linearity (R2 .0.999), with a detection limit of 0.023% and 0.110% by volume, respectively. Both sensors were robust against ambient temperature variations in the range of 5 to 356C. While one sensor was robust against humidity variations, the other was found to be significantly affected by humidity. However, the problem was solved by equipping the sensor with a heating unit to increase the sensor surface temperature to 356C. Field studies at three sites confirmed the performance and accuracy of the sensors when applied to actual sewer conditions, and revealed substantial and highly dynamic methane concentrations in sewer air.
Keyword Greenhouse gas emissions
Humidity
Systems
Oxidation
Dynamics
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Advanced Water Management Centre Publications
 
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