Anodic reactivity of ferrous sulfide precipitates changing over time due to particulate speciation

Mejia Likosova, Elena, Collins, Richard N., Keller, Jurg and Freguia, Stefano (2013) Anodic reactivity of ferrous sulfide precipitates changing over time due to particulate speciation. Environmental Science and Technology, 47 21: 12366-12373. doi:10.1021/es402967e


Author Mejia Likosova, Elena
Collins, Richard N.
Keller, Jurg
Freguia, Stefano
Title Anodic reactivity of ferrous sulfide precipitates changing over time due to particulate speciation
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
1520-5851
Publication date 2013-11-05
Year available 2013
Sub-type Article (original research)
DOI 10.1021/es402967e
Open Access Status Not yet assessed
Volume 47
Issue 21
Start page 12366
End page 12373
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract The disposal of ferric phosphate (FePO4) sludge, routinely generated in wastewater and drinking water treatment, has a major impact on the overall treatment cost. Iron sulfide (FeSx) precipitation via sulfide addition to ferric phosphate (FePO4) sludge has been proven to be an effective method for phosphate recovery. Electrochemical oxidation of FeSx can then be utilized to recover ferric iron for reuse back in the phosphate removal process. In this study, the reactivity of FeSx particles for anodic oxidation at pH 4 was studied as a function of time after FeSx precipitate generation at a S/Fe molar ratio of 1.75. Cyclic voltammetry showed high reactivity for fresh FeSx particles, but the reactivity diminished significantly over a period of 1 month. X-ray absorption spectroscopy (XAS) revealed that this reduced reactivity with time is a consequence of the transformation of the FeSx particles in suspension from mackinawite (FeS) to pyrite (FeS2).
Keyword Engineering, Environmental
Environmental Sciences
Engineering
Environmental Sciences & Ecology
ENGINEERING, ENVIRONMENTAL
ENVIRONMENTAL SCIENCES
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID LE110100174
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Advanced Water Management Centre Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 5 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Mon, 25 Nov 2013, 21:52:00 EST by Elena Mejia Likosova on behalf of School of Chemical Engineering