Simultaneous use of caustic and oxygen for efficient sulfide control in sewers

Lin, Hui-Wen, Lu, Yang, Ganigue, Ramon, Sharma, Keshab R., Rabaey, Korneel, Yuan, Zhiguo and Pikaar, Ilje (2017) Simultaneous use of caustic and oxygen for efficient sulfide control in sewers. Science of the Total Environment, 601-602 776-783. doi:10.1016/j.scitotenv.2017.05.225

Author Lin, Hui-Wen
Lu, Yang
Ganigue, Ramon
Sharma, Keshab R.
Rabaey, Korneel
Yuan, Zhiguo
Pikaar, Ilje
Title Simultaneous use of caustic and oxygen for efficient sulfide control in sewers
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 1879-1026
Publication date 2017-12-01
Year available 2017
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2017.05.225
Open Access Status Not yet assessed
Volume 601-602
Start page 776
End page 783
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 2305 Environmental Engineering
2304 Environmental Chemistry
2311 Waste Management and Disposal
2310 Pollution
Abstract Periodic caustic shock-loading is a commonly used method for sulfide control in sewers. Caustic shock-loading relies on the elevation of the sewage pH to ≥ 10.5 for several hours, thereby removing sewer pipe biofilms as well as deactivating SRB activity in the remaining biofilm. Although a widely used method, SRB activity is often not completely inhibited, and as such sulfide is still being generated. Here, we propose and experimentally demonstrate an innovative approach which combines caustic with oxygen, another commonly used method, as a dosing strategy for overcoming the drawbacks of caustic shock-loading. Six laboratory-scale rising main reactors were subjected to three dosing schemes over a period of three months, namely (i) simultaneous caustic and oxygen addition, (ii) caustic addition and (iii) no chemical addition. Our results showed that the combination of caustic and oxygen achieved efficient sulfide control, leading to a prolonged biofilm recovery period in between caustic shocks. In addition, methane emissions were reduced to a negligible level compared to caustic treatment only. To translate the findings to real-life application, the key parameters obtained during the long-term lab-scale experiments were subjected to extensive simulation studies using the SeweX model under a wide range of conditions commonly found in sewers. Overall, this study highlights the potential of periodic shock-loading and intermittent oxygen injection as combined dosing strategy for efficient sulfide control in sewers.
Keyword Sewer corrosion
Sulfate reducing bacteria
Sulfide abatement
Dynamic modelling
Caustic shock-loading
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID LP120200238
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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