Online dissolved methane and total dissolved sulfide measurement in sewers

Liu, Yiwen, Sharma, Keshab R., Fluggen, Markus, O'halloran, Kelly, Murthy, Sudhir and Yuan, Zhiguo (2015) Online dissolved methane and total dissolved sulfide measurement in sewers. Water Research, 68 109-118. doi:10.1016/j.watres.2014.09.047


Author Liu, Yiwen
Sharma, Keshab R.
Fluggen, Markus
O'halloran, Kelly
Murthy, Sudhir
Yuan, Zhiguo
Title Online dissolved methane and total dissolved sulfide measurement in sewers
Journal name Water Research   Check publisher's open access policy
ISSN 1879-2448
0043-1354
Publication date 2015-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.watres.2014.09.047
Open Access Status
Volume 68
Start page 109
End page 118
Total pages 10
Place of publication London, United Kingdom
Publisher Elsevier Ltd
Collection year 2015
Language eng
Abstract Recent studies using short-term manual sampling of sewage followed by off-line laboratory gas chromatography (GC) measurement have shown that a substantial amount of dissolved methane is produced in sewer systems. However, only limited data has been acquired to date due to the low frequency and short span of this method, which cannot capture the dynamic variations of in-sewer dissolved methane concentrations. In this study, a newly developed online measuring device was used to monitor dissolved methane concentrations at the end of a rising main sewer network, over two periods of three weeks each, in summer and early winter, respectively. This device uses an online gas-phase methane sensor to measure methane under equilibrium conditions after being stripped from the sewage. The data are then converted to liquid-phase methane concentrations according to Henry's Law. The detection limit and range are suitable for sewer application and can be adjusted by varying the ratio of liquid-to-gas phase volume settings. The measurement presented good linearity (R2>0.95) during field application, when compared to off-line measurements. The overall data set showed a wide variation in dissolved methane concentration of 5-15mg/L in summer and 3.5-12mg/L in winter, resulting in a significant average daily production of 24.6 and 19.0kg-CH4/d, respectively, from the network with a daily average sewage flow of 2840m3/day. The dissolved methane concentration demonstrated a clear diurnal pattern coinciding with flow and sulfide fluctuation, implying a relationship with the wastewater hydraulic retention time (HRT). The total dissolved sulfide (TDS) concentration in sewers can be determined simultaneously with the same principle.
Keyword Emission
GHG
Methane
Online
Sensor
Sewer
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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