Electrochemical sulfide removal from synthetic and real domestic wastewater at high current densities

Pikaar, Ilje, Rozendal, René A., Yuan, Zhiguo, Keller, Jürg and Rabaey, Korneel (2011) Electrochemical sulfide removal from synthetic and real domestic wastewater at high current densities. Water Research, 45 6: 2281-2289. doi:10.1016/j.watres.2010.12.025


Author Pikaar, Ilje
Rozendal, René A.
Yuan, Zhiguo
Keller, Jürg
Rabaey, Korneel
Title Electrochemical sulfide removal from synthetic and real domestic wastewater at high current densities
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2011-03
Sub-type Article (original research)
DOI 10.1016/j.watres.2010.12.025
Volume 45
Issue 6
Start page 2281
End page 2289
Total pages 9
Place of publication London, U.K.
Publisher IWA Publishing
Collection year 2012
Language eng
Formatted abstract
Hydrogen sulfide generation is the key cause of sewer pipe corrosion, one of the major issues in water infrastructure. Current abatement strategies typically involve addition of various types of chemicals to the wastewater, which incurs large operational costs. The transport, storage and application of these chemicals also constitute occupational and safety hazards. In this study, we investigated high rate electrochemical oxidation of sulfide at Ir/Ta mixed metal oxide (MMO) coated titanium electrodes as a means to remove sulfide from wastewater. Both synthetic and real wastewaters were used in the experiments. Electrochemical sulfide oxidation by means of indirect oxidation with in-situ produced oxygen appeared to be the main reaction mechanism at Ir/Ta MMO coated titanium electrodes. The maximum obtained sulfide removal rate was 11.8 ± 1.7 g S m−2 projected anode surface h−1 using domestic wastewater at sulfide concentrations of ≥30 mg L−1 or higher. The final products of the oxidation were sulfate, thiosulfate and elemental sulfur. Chloride and acetate concentrations did not entail differences in sulfide removal, nor were the latter two components affected by the electrochemical oxidation. Hence, the use of electrodes to generate oxygen in sewer systems may constitute a promising method for reagent-free removal of sulfide from wastewater.

Research highlights: ► Sulfide oxidation from synthetic feed and domestic waste water was demonstrated using Ir/Ta MMO coated titanium electrodes. ► Sulfide oxidation by means of in-situ generated oxygen appears the predominant reaction mechanism. ► Acetate and chloride concentrations remained constant. ► Ir/Ta MMO coated titanium electrodes are suitable for oxygen generation in sewer systems.
Keyword Sewer corrosion
Electrochemical systems
Sulfide oxidation
In-situ oxygen generation
Stoichiometry
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Advanced Water Management Centre Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 32 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 17 Nov 2011, 11:39:41 EST by Mr Ilje Pikaar on behalf of Advanced Water Management Centre