Journal article
Anodic reactivity of ferrous sulfide precipitates changing over time due to particulate speciation
E Mejia Likosova, RN Collins, J Keller, S Freguia
Environmental Science and Technology | AMER CHEMICAL SOC | Published : 2013
DOI: 10.1021/es402967e
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 FeS x 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 r..
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Awarded by Australian Research Council
Funding Acknowledgements
We sincerely thank Daniel Boland from UNSW for his significant contribution during the synchrotron experiments at the National Synchrotron Radiation Research Centre (NSRRC) in Taipei, Taiwan. Part of this research was undertaken at the Australian National Beam line Facility at the Photon Factory in Japan, operated by the Australian Synchrotron. We acknowledge the Australian Research Council (LE110100174) for financial support and the High Energy Accelerator Research Organisation (KEK) in Tsukuba, Japan, for operations support. Travel funding to the National Synchrotron Radiation Research Centre, Taipei, Taiwan, was provided by the International Synchrotron Access program (ISAP) managed by the Australian Synchrotron and funded by the Australian Government. Elena Mejia Likosova thanks the University of Queensland for scholarship support. The authors thank Veolia Water and Seqwater for the funding support. The Australian Research Council (LP100200122) funded this work. Richard Collins is a recipient of an Australian Research Council Future Fellowship (FT110100067).