Long-term field test of an electrochemical method for sulfide removal from sewage

Pikaar, Ilje, Li, Eugena, Rozendal, René A., Yuan, Zhiguo, Keller, Jürg and Rabaey, Korneel (2012) Long-term field test of an electrochemical method for sulfide removal from sewage. Water Research, 46 9: 3085-3093. doi:10.1016/j.watres.2012.03.013

Author Pikaar, Ilje
Li, Eugena
Rozendal, René A.
Yuan, Zhiguo
Keller, Jürg
Rabaey, Korneel
Title Long-term field test of an electrochemical method for sulfide removal from sewage
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2012-06
Sub-type Article (original research)
DOI 10.1016/j.watres.2012.03.013
Volume 46
Issue 9
Start page 3085
End page 3093
Total pages 9
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2013
Language eng
Abstract Corrosion caused by hydrogen sulfide leads to significant costs for the rehabilitation or replacement of corroded sewer pipes. Conventional methods to prevent sewer corrosion normally involve the dosing of significant amounts of chemicals with the associated transport and storage costs as well as considerable maintenance and control requirement. Recently, a novel chemical free method for sulfide abatement based on electrochemical sulfide oxidation was shown to be highly effective for the removal of sulfide from synthetic and real sewage. Here, we report on the electrochemical removal of sulfide using Ta/Ir and Pt/Ir coated titanium electrodes under simulated sewer conditions during field trials. The results showed that sulfide can successfully be removed to levels below the normal target value at the end of a simulated rising main (i.e. <1. mg/L). A coulombic efficiency for dissolved oxygen generation of ~60% was obtained and was independent of the current density. Scaling of the electrode and the membrane was observed in the cathode compartment and as a result the cell potentials increased over time. The cathode potentials returned to their original potential after switching the polarity every two days, but a more frequent switching would be needed to reduce the energy requirements of the system. Accelerated lifetime experiments indicated that a lifetime of 6.0. ±. 1.9 years can be expected under polarity switching conditions at a pH of 14 and significantly longer at lower pH values. As operating the system without switching simplifies construction as well as operation, the choice whether to switch or not will in practice depend on operational cost (higher/lower energy) versus capital cost (reactor and peripherals). Irrespective of the approach, our study demonstrates that electrochemical sulfide control in sewer systems may be an attractive new option.
Keyword Electrochemical oxidation
Sewer corrosion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 15 March 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
Advanced Water Management Centre Publications
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