A novel electrochemical process for the recovery and recycling of ferric chloride from precipitation sludge

Mejia Likosova, E., Keller, J., Poussade, Y. and Freguia, S. (2014) A novel electrochemical process for the recovery and recycling of ferric chloride from precipitation sludge. Water Research, 51 96-103. doi:10.1016/j.watres.2013.12.020

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Author Mejia Likosova, E.
Keller, J.
Poussade, Y.
Freguia, S.
Title A novel electrochemical process for the recovery and recycling of ferric chloride from precipitation sludge
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2014-03-15
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.watres.2013.12.020
Open Access Status Not yet assessed
Volume 51
Start page 96
End page 103
Total pages 8
Place of publication London, United Kingdom
Publisher I W A Publishing
Language eng
Subject 2312 Water Science and Technology
2311 Waste Management and Disposal
2310 Pollution
2302 Ecological Modelling
Abstract During wastewater treatment and drinking water production, significant amounts of ferric sludge (comprising ferric oxy-hydroxides and FePO4) are generated that require disposal. This practice has a major impact on the overall treatment cost as a result of both chemical addition and the disposal of the generated chemical sludge. Iron sulfide (FeS) precipitation via sulfide addition to ferric phosphate (FePO4) sludge has been proven as an effective process for phosphate recovery. In turn, iron and sulfide could potentially be recovered from the FeS sludge, and recycled back to the process. In this work, a novel process was investigated at lab scale for the recovery of soluble iron and sulfide from FeS sludge. Soluble iron is regenerated electrochemically at a graphite anode, while sulfide is recovered at the cathode of the same electrochemical cell. Up to 60±18% soluble Fe and 46±11% sulfide were recovered on graphite granules for up-stream reuse. Peak current densities of 9.5±4.2Am-2 and minimum power requirements of 2.4±0.5kWhkgFe-1 were reached with real full strength FeS suspensions. Multiple consecutive runs of the electrochemical process were performed, leading to the successful demonstration of an integrated process, comprising FeS formation/separation and ferric/sulfide electrochemical regeneration.
Keyword Electrochemical sulfur recovery
Ferrous oxidation
Iron recovery
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID LP100200122
Institutional Status UQ
Additional Notes Available online: 27 December 2013.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Advanced Water Management Centre Publications
 
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